HP XP12000, SVS200, XP10000 User Manual

HP StorageWorks Business Copy XP user guide for the XP12000/XP10000/SVS200
Part number: T1713-96007
ifth edition: March 2007
F
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© Copyright 1999, 2007 Hewlett-Packard Development Company, L.P. Condential computer software. Valid license from HP required for possession, use or copying. Consistent with FAR 12.211 and
12.212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under vendor's standard commercial license.
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Microsoft, Windows, Windows XP, and Windows NT are U.S. registered trademarks of Microsoft Corporation. UNIX is a registered trademark of The Open Group.
Contents
Aboutthisguide .......................... 7
Intendedaudience...................................... 7
Prerequisites ........................................ 7
Relateddocumentation.................................... 7
Documentconventionsandsymbols .............................. 8
HPtechnicalsupport..................................... 8
Subscriptionservice ..................................... 9
HPwebsites......................................... 9
Documentationfeedback ................................... 9
1BusinessCopyXP(BC)fortheArray ................. 11
OverviewofBCoperations .................................. 11
BCcomponents..................................... 11
BCvolumepairs(P-VOLsandS-VOLs)......................... 12
CopyThresholdoption............................... 13
Cascadepairs .................................. 13
BCsoftwareontheCommandViewXPmanagementstation............... 13
BCrequirementsforthearray .............................. 13
Maximumnumberofpairsforthearray........................ 15
BCoperations..................................... 21
Setreserveattributeoperation............................ 21
Resetreserveattributeoperation........................... 21
Paircreateoperation ................................ 21
Initialcopyoperation................................ 21
Updatecopyoperation............................... 22
Cascadefunction ................................. 23
Pairsplitoperation................................. 23
Pairresyncoperations................................ 24
Forwardpairresyncoperation ............................ 25
Backwardpairresyncoperation ........................... 25
Pairstatusandtimerequiredforpairresync ...................... 30
Pairsplit-Eoperation(suspend)............................ 30
Pairsplit-Soperation(delete)............................. 31
BCoptions...................................... 31
Swap&Freezeoption................................ 31
HostI/OPerformanceoption ............................ 32
Cascadefunction ................................... 32
At-TimeSplitfunction.................................. 36
EnablingtheAt-TimeSplitfunctionusingRAIDManager................. 37
Pairstatus ...................................... 38
Cautionsonswitchingoffthepowersupply ........................ 40
CautionsonusingtheXP10000............................. 41
PreparingforBCoperations................................. 41
Systemrequirements .................................. 41
PreparingforBCoperations............................... 42
CombiningBCwithotherdatamanagementoperations................... 43
CombiningBCandContinuousAccessXPJournaloperations................. 43
CombiningBCandContinuousAccessXPoperations.................... 46
CombiningBCwithLUNSecurityXPExtension....................... 49
Copyingaccessattributes................................ 49
License capacity of LUN Security XP Extension . . . . . . . . . . . . . . . . . . . . . . . 51
Business Copy XP user guide
3
StartingBC........................................ 52
BCmainscreen.................................... 53
Volumelist .................................... 55
Detailwindow................................... 57
S-VolPathwindow................................. 58
DisplayFilterwindow ............................... 59
PresetVolumelist ................................. 60
PerformingBCoperations.................................. 61
Settingreserveattributes ................................ 61
ReservingoneormorevolumesforuseasBCS-VOLs.................. 61
Resettingreserveattributes ............................... 62
Unreservingoneormorevolumes .......................... 62
CreatingBCpairs(Paircreate).............................. 63
PaircreateVolumeList................................ 64
CopyPacelist................................... 64
SelectMUlist................................... 64
SelectS-Volbox.................................. 65
Buttons...................................... 65
CreatingL1pairs ................................. 66
CreatingL2pairs ................................. 67
SplittingBCpairs(Pairsplit) ............................... 67
PairsplitVolumeList ................................ 67
Windowoptions.................................. 68
SelectS-Volbox.................................. 68
Buttons...................................... 69
Splittingpairs................................... 69
Creatingandsplittingpairs............................. 70
ResynchronizingBCpairs(Pairresync)........................... 71
PairresyncVolumeList ............................... 71
Windowoptions.................................. 72
ResynchronizingoneormoreBCpairs ........................ 72
SuspendingBCpairs(Pairsplit-E)............................. 73
SuspendingoneormoreBCpairs .......................... 73
DeletingBCpairs(Pairsplit-S) .............................. 74
DeletingoneormoreBCpairs............................ 74
ViewingBCpairstatusandhistory............................ 74
SettingBCoptions................................... 76
SettingaBCoption(Swap&Freezeoption)....................... 77
BCerrorcodes .................................... 77
Index .............................. 83
4
Figures
1 2
3 4 5 6 7 8 9
10
11 12 13 14
15 16 17 18 19
20
21
22 23 24 25
26 ..BCmainscreen ................................ 53
27 28 29 30
31
32 33 34 35
36 37 38 39 40
..BCoverview.................................. 12
..AddingapairinBC .............................. 22
..Update copy o
..Normalandquickpairresyncoperations...................... 25
..Reverseandquickrestorepairoperations ..................... 27
..BC P-VOL forming pair with Continuous Access XP S-VOL and external S-VOL, respectively . 29 ..BC P-VOL forming pair with external S-VOL and shared as Continuous Access XP S-VOL . . 29 ..BC S-VOL forming pair with external P-VOL and shared as Continuous Access XP P-VOL . . 29
..BCP-VOLformingpairwithCAXPJou.S-VOLandExt.S-VOL,respectively....... 29
..BC P-VOL forming pair with external S-VOL and shared as Continuous Access XP Journal S-VOL 29 ..Quick Rest
..Cascadepairs................................. 33
..OverviewofAt-TimeSplitfunction......................... 37
..BCpairstatustransitions ............................ 38
..BCandContinuousAccessXPJournal:SharedP-VOLandP-VOL ........... 44
..BCandContinuousAccessXPJournal:SharedP-VOLandS-VOL ........... 45
..BC and Continuous Access XP Journal: Shared P-VOL and P-VOL and P-VOL and S-VOL . . 45
..BCandContinuousAccessXP:sharedP-VOL/P-VOL................. 46
..BC and C
..BCandContinuousAccessXP:sharedP-VOL/P-VOLandP-VOL/S-VOL......... 47
..BCandContinuousAccessXP:sharedS-VOL/P-VOL................. 48
..BC, Continuous Access XP Journal, and Continuous Access XP: Shared S-VOL/P-VOL/S-VOL 48 ..BC, Continuous Access XP, and Continuous Access XP Journal: Shared S-VOL/P-VOL/S-VOL 49
..Copyingaccessattribute ............................ 50
..Required license capacity for LUN Security XP Extension when using cascade function . . 52
..Volumelist................................... 56
..Detailwindow................................. 58
..S-VolPathwindow ............................... 58
..DisplayFilterwindow(BCtabselected) ...................... 59
setVolumelist................................ 60
..Pre ..
SetReserveAttributewindow........................... 61
..ResetReserveAttributewindow.......................... 62
..Paircreatewindow ............................... 63
..Pairsplitwindow ................................ 67
..Pairresyncwindow ............................... 71
..Pairsplit-Ewindow ............................... 73
..Pairsplit-Swindow ............................... 74
istorypane.................................. 75
..H
..Optionscreen ................................. 76
peration ............................. 23
ore operation with or without Swap&Freeze option . . . . . . . . . . . . . 32
ontinuousAccessXP:sharedP-VOL/S-VOL................. 47
Business Copy XP user guide
5
Tables
1 2
3 4 5 6
7 8 9
10
11 12 13 14 15 16 17 18 19 ..BC tree
20
21
22 23
..Documentconventions............................... 8
..BCoperationalrequirementsforthearray ..................... 14
..Totalnumberofdifferentialtablesperpair..................... 17
..Numberofcontrolcylindersaccordingtoemulationtypes .............. 17
..Relationship between emulation type, capacity, and differential tables . . . . . . . . . 18
..NumberofdifferentialtablesusedinOPEN-V ................... 18
..Requirements for reverse or quick restore pairresync operations . . . . . . . . . . . . 28
..BCoptionstypesandrequirements ........................ 31
..RelationshipbetweenL1pairstatusandL2pairoperations.............. 34
..RelationshipbetweenL2pairstatusandL1pairoperations.............. 35
..Read/wri
..Read/write operation (host to the leaf volume) and L2 pair status . . . . . . . . . . . 36
..BCpairstatusconditions ............................ 40
..IdentifyingthevolumesforBCoperations ..................... 42
..AccessattributeandavailabilityasaBCpairvolume ................ 49
..Availability of BC operations on volumes with the S-VOL Disable attribute . . . . . . . . 49
..VMAsettingandavailabilityofPaircreateoperation................. 50
..PairstatusandavailabilityofLUNSecurityXPExtensionoperations .......... 51
..StatusiconsforBC............................... 54
..BCoperationsshortcutmenucommands...................... 57
..BCpairactivitycodes,messages,anddescriptions ................. 76
..BCerrorcodes................................. 77
te operation (host to the node volume) and L1/L2 pair status . . . . . . . . . 35
icons ................................. 53
6
About this guide
This guide provides information about:
using Business Copy XP operations
preparing Business Copy XP operations
starting Business Copy XP operations
performing Business Copy XP operations
understanding Business Copy XP operation error codes
Intended audience
This guide is
Disk array hardware and software
Data processing and RAID storage subsystems and their basic functionsand utilities
Prerequisites
Prerequisites for using this product include:
Installation of the HP StorageWorks disk array(s)
Installation of the license key for this product
intended for customers and HP-authorized service providers with knowledge of:
Related do
The following documents provide related information:
HP StorageWorks Command View XP user guide for XP Disk Arrays
HP Storage
HP StorageWorks Snapshot XP user guide
HP StorageWorks LUN Conguration and Security Manager XP user guide for the
XP12000/XP10000
HP Storag
HP StorageWorks RAID Manager XP user guide
Hitachi ShadowImage for z/OS user guide
HP Stora
HP StorageWorks Performance Control XP user guide
HP StorageWorks Flex Copy XP user guide
You can nd these documents from the Manuals page of the HP Business Support Center website:
ttp://www.hp.com/support/manuals
h
In the S
cumentation
Works XP Remote Web Console user guide for XP12000/XP10000
eWorks LUN Security XP Extension user guide
geWorks External Storage XP user guide
torage section, click Storage Software and then select your product.
Business Copy XP user guide
7
Document conven
Table 1 Document conventions
tions and symbols
Convention
Blue text: Table 1 Blue, underlined text: http://www.hp.com Bold text
Italic text Text emphasis Monospace text
Monospace, italic text
Monospace, bold text
Element
Cross-reference links and e-mail addresses website addresses
Keys that are p
Text typed in
GUI elements
menu and lis
File and directory names
System output
Code
Commands, their arguments, and argument values
Code variables
Command variables
Emphasized monospace text
ressed
to a GUI element, such as a box
that are clicked or selected, such as
t items, buttons, tabs, and check boxes
CAUTION:
Indicates that failure to follow directions could result in damage to equipment or data.
IMPORTANT:
Provides clarifying information or specic instructions.
NOTE:
Provides additional information.
TIP:
Provides helpful hints and shortcuts.
HP technical support
For worldwide technical support information, see the HP support website:
ttp://www.hp.com/support
h
Before contacting HP, collect the following information:
Product model names and numbers
Technical support registration number (if applicable)
Product serial numbers
Error messages
Operating system type and revision level
8
About this guide
Detailed questions
Subscription s
HP recommends t
h
ttp://www.hp
After register rmware updat
ervice
hatyouregisteryourproductattheSubscriber'sChoiceforBusinesswebsite:
.com/go/e-updates
ing, you will receive e-mail notication of product enhancements, new driver versions,
es, and other product resources.
HP websites
For additional information, see the following HP websites:
•h
ttp://www.hp.com
•http://www.hp.com/go/storage
•http://www.hp.com/service_locator
•http://www.hp.com/support/manuals
Documentation feedback
HP welcomes your feedback. To make comm
storagedoc
ents and suggestions about product documentation, please send a message to
s.feedback@hp.com. All submissions become the property of HP.
Business Copy XP user guide
9
10
About this guide
1 Business Copy XP (BC) for the Array
HPStorageWorksBusinessCopyXP(BC)maintainsinternalcopiesofuserdataondiskarraysfor purposes such as data backup or duplication. Duplicate volumes are created on the same disk array as the primary volume at hardware speeds. BC is used for UNIX and PC server data, and can provide up to nine duplicates of one primary volume.
This chapter provides instructions for performing BC operations using Command View XP or XP Remote Web Console.
NOTE:
See the for instructions on accessing Business Copy from Command View XP Advanced Edition.
BC operations are nondisruptive and allow the primary (main) volume of each volume pair to remain online to all hosts for read and write I/O operations.
After establishing operations, BC operations continue unattended to provide asynchronous internal data backup. Usability is further enhanced through a resynchronization capability that reduces data duplication requirements and backup time, thereby increasing user productivity. BC also supports reverse resynchronization.
HP StorageWorks Command View XP Advanced Edition Device Manager Web Client user guide
You can perform BC operations in conjunction with HP StorageWorks Continuous Access XP operations to provide additional remote copies of BC volumes. BC also supports the disk array's custom volume size (CVS) and Cache LUN features, ensuring that BC operations can duplicate all user data. See
Combining BC with other data management operations for further information on combining BC with
other data management features. You can also perform BC operations with External Storage XP operations to create pairs with external
volumes.
Overview of BC operations
BC is a storage-based hardware solution for duplicating logical volumes that reduces backup time and provides point-in-time backup. BC primary volumes (P-VOLs) contain original data; BC secondary volumes (S-VOLs) contain duplicate data. You can use the BC cascaded volume function to make up to nine copies of each P-VOL. Because each S-VOL is paired with its P-VOL independently, each S-VOL can be maintained as an independent copy set that can be split, resynchronized, and deleted separately from other S-VOLs assigned to the same P-VOL.
BC components
BC operations on the Command View XP management station or XP Remote Web Console involve primary and secondary volumes in the disk array. Figure 1 shows a typical BC conguration. BC system components are:
• BC volume pairs (P-VOLs and S-VOLs)
• BC software on the Command View XP management station
Business Copy XP user guide
11
Figure 1 BC overview
Use BC from the Command View XP management station or XP Remote Web Console to make local copies of volumes. The volume that has original data is called a P-VOL (primary volume), and a volume to which data is copied is called an S-VOL (secondary volume). Pairs of P-VOLs and S-VOLs made by BC are called BC pairs. You can specify an S-VOL as a P-VOL to make another two BC pairs. As a result, you can use BC to make a total of nine S-VOLs. Use the cascade style to make BC pairs by specifying S-VOLs as P-VOLs. In cascade style, pairs in the rst cascade layer are called L1 pairs and pairs in the second cascade layer are called L2 pairs.
BC volume pairs (P-VOLs and S-VOLs)
Disk arrays contain and manage original and copied BC data. The XP1024/XP128 disk arrays support a maximum of 8,190 BC volumes: 4,095 pairs and the RAID Manager command device. The XP12000 disk array supports a maximum of 16,382 BC volumes (8,191 pairs: (8,191 P-VOLs and 8,191 S-VOLs) and the RAID Manager command device. When BC pairs include size-expanded LUs, the maximum number of pairs decreases. When pairs include more than one S-VOL, the maximum number of P-VOLs decreases.
BC performs copy operations for logical volume pairs that you establish. Each BC pair consists of one primary volume (P-VOL) and up to three secondary volumes (S-VOLs). These volumes can be located in the XP disk array or in external storage attached to the XP disk array. BC S-VOLs are secondary or mirrored volumes containing backup data. Each S-VOL must be paired with only one P-VOL. During BC operations, P-VOLs remain available to all hosts for read and write I/O operations (except during reverse resync and quick restore). S-VOLs become available for host access only after the pair is split.
When a BC volume pair is created, data on the P-VOL is copied to the S-VOL to synchronize the volumes. During this initial copy operation and after the pair is synchronized, all write operations to the S-VOL are prohibited. To access an S-VOL, you can “split” the pair to make the S-VOL accessible. While a BC pair is split, the disk array keeps track of all changes to the P-VOL and S-VOL. When you “resync” the pair, the
12
Business Copy XP (BC) for the Array
differential data in the P-VOL (due to P-VOL and S-VOL updates) is copied to the S-VOL, so the S-VOL is again identical to the P-VOL. For reverse resync, the differential data in the S-VOL (due to P-VOL and S-VOL updates) is copied to the P-VOL, so the P-VOL is now identical to the S-VOL.
NOTE:
BC S-VOLs are updated asynchronously. For a volume pair with PAIR status, the P-VOL and S-VOL may not be identical. For further information on BC update copy operations, see Paircreate operation.
BC P-VOLs or S-VOLs should not be concentrated in the same RAID group. To disperse workloads of RAID groups, each RAID group should have both P-VOLs and S-VOLs evenly distributed. BC pairs for which BC operations are performed simultaneously should be in different RAID groups. If BC pairs are concentrated in only a few RAID groups, host I/O performance may be degraded.
If the disk array is overloaded, increase cache, disk adapters, and/or RAID groups. Consider assigning BC S-VOLs in newly installed RAID groups. If you continue BC operations with an overloaded disk array, host I/O performance may be degraded.
Copy Threshold option
If BC performs copy operations when the disk array workload is heavy, host server I/O performance might be degraded. To minimize this performance degradation, enable Copy Threshold,which temporarily stops all BC copy operations when the disk array has a heavy workload. Copy operations that are stopped by the Copy Threshold option resume when the disk array workload is lighter.
This option is different from the Host I/O Performance option (Host I/O Performance option), because it is effective only when the disk array workload is heavy.
NOTE:
Contact your HP support account representative for more information about the Copy Threshold option.
In addition to BC operations, Copy Threshold temporarily stops copy operations for the following applications when the disk array workload is heavy:
Auto LUN XP
ShadowImage for z/OS
Hitachi FlashCopy Mirroring
Hitachi FlashCopy Mirroring Version 2
Snapshot XP
Flex Copy XP
Cascade pairs
The BC cascade function adds a second layer of pairs onto the rst layer of original BC pairs. Use these two layers of pairs (L1 and L2) to create and maintain up to nine copies of one original BC primary volume (P-VOL). See Cascade function for further information on the cascade function.
BC software on the Command View XP management station
When installed on the Command View XP management station, the BC software displays BC information and performs BC operations. The Command View XP management station can be attached to multiple disk arrays. The Command View XP management station acquires status from and issues commands to BC P-VOLs and S-VOLs.
BC re
quirements for the array
BC operations provide local copies of UNIX/PC server volumes (LUs) on the disk array. The following table describes the operational requirements for BC.
Business Copy XP user guide
13
Table 2 BC operational requirements for the array
Parameter
Pair objects Logical device
Number of copies Maximum of three copies (S-VOLs) per primary volume (P-VOL). Maximum of one
Requirement
s (LDEVs): OPEN-x (such as OPEN-3, OPEN-9, OPEN-E, and OPEN-V), inclu congured. The P-VOL and S-VOL must be the same type (for example, OPEN-3 to OPEN-3 is allowed, OPEN-3 to OPEN-9 is not allowed).
AcustomsizeP-VOLmustbepairedwithS-VOLsofthesametypeandcapacity. ALUSEP-VOLmustbepairedwithS-VOLsofthesamesizeandstructure.For example, if a LUSE P-VOL is connected to volumes of 1GB, 2GB, and 3GB in this order, you must specify the LUSE volume that has exactly the same size and connection order as the S-VOL.
BC does not support multiplatform devices (for example, 3390-3A, -3B, -3C). For information about using Snapshot XP pair volumes as Business Copy XP
volumes, pl Snapshot XP
P-VOLs or S­Journal vo
specied as P-VOLs or S-VOLs. Volumes that form a Flex Copy XP pair cannot be specied as P-VOLs. A Flex
Copy XP P-VOL can be specied as a Business Copy XP S-VOL under certain conditions. Refer to the HP StorageWorks Flex Copy XP user guide for more informat
BC operat pairs th same conditions applied to the volumes in the local disk array. Refer to the HP StorageWorks External Storage XP user guide for more information.
P-VOL per S-VOL (P-VOLs cannot share an S-VOL). An additional six copies can be created by using the BC cascade function.
ding CVS and LUSE volumes. Devices must be installed and
ease refer to Snapshot XP User’s Guide.
pairs, virtual volumes, and pool volumes cannot be specied as
VOLs.
lumes for HP StorageWorks Continuous Access XP Journal cannot be
ion.
ions can be performed with External Storage XP operations to create
atusetheexternalvolumesasBCS-VOLs(ormirroringvolumes)underthe
Maximum number of
1
pairs
mum number of
Maxi
Ls
S-VO MU (mirror unit) numbers
of cascade pairs
Combinations of RAID levels (primary­secondary)
Dynamic sparing and automatic correction copy
A maximum of 8,192 pairs (8,192 P-VOLs and 8,192 S-VOLs) can be created per disk array.
NOTE:
The maximum number of pairs equals the total number of BC, Snapshot XP, ShadowImage for z/OS, Hitachi FlashCopy Mirroring, Hitachi FlashCopy Mirroring Version 2, Auto LUN XP, and Flex Copy XP volume pairs.
When you use RAID Manager, the command device reduces the maximum n u mber o f B C p a i r s t o 8 ,191 ( 8 ,191 P - VO Ls a n d 8 ,191 S - VO L s ) w hen c o n guring pairsinaratioof1S-VOLto1P-VOL.
IfsomeBCpairscontainLUSEvolumes,orifanapplicationotherthanBCisused, the maximum number of BC pairs might be less than 8,192 (or 8,191).
Refer to Maximum number of pairs for the array Maximum number of pairs for the array” on page 15 for information about calculating the maximum number of BC pairs.
2(8,191ifRAIDManagerisused).
8,19
L1 pairs = 0, 1, and 2 (a total of 3 pairs) L2pairs=1and2(atotalof2pairs)
All combinations supported: RAID1-RAID1, RAID5-RAID5, RAID6-RAID6, RAID1-RAID5, RAID1-RAID6, RAID5-RAID1, RAID5-RAID6, RAID6-RAID1, RAID6-RAID5.
failure occurs requiring the disk array to utilize dynamic sparing or automatic
If a correction copy, the status of the paired volumes associated with the failed physical device is not affected.
14
Business Copy XP (BC) for the Array
Parameter
Requirement
Physical device (PDEV) maintenance
Logical device maintenance
Cache maintenance
Point-in-time backup
s
Failure
Maintenance/upgrade
(LDEV)
Maintenance of a PDEV that is not used by BC does not affect BC operations or the status of BC pairs. If a PDEV contains LDEVs used by BC, you can maintain that PDEV independently of the BC operations and pair status.
If the status of a BC pair is COPY(PD), PAIR, PSUS, PSUS(SP), COPY(SP), COPY(RS), or COPY(RS-R), maintenance for the LDEVs used by that pair is restricted. Maintenance is also restricted for LDEVs with the Reserve attribute.
To maintain these LDEVs, suspend or delete the BC pair, or reset (unreserve) the Reserve attribute.
If disk array cache maintenance is performed during a period of high I/O usage, one or more BC pairs may be suspended. Reduce the I/O load before cache maintenance.
For pairs in PAIR status, host I/Os are copied to S-VOLs asynchronously. To synchronize a pair and access the S-VOL as soon as possible, take the P-VOL ofine and split the pair before using the S-VOL. If the P-VOL cannot be taken ofine, a P.I.T. backup still occurs if a pairsplit is issued. When all data on the P-VOL (up to the pairsplit time) is copied to the S-VOL, the pair is split and the S-VOL becomes available for use (R/W). The operation may take longer to complete if high write activity from the host to the P-VOL is occurring. A P.I.T. backup can also be performed by issuing a pairsplit to P-VOLs in the SMPL (simplex) state (in this case the pairsplit operation simultaneously creates and splits new BC pairs.).
When a failure of any kind prevents a BC copy operation from completing, the
ay suspends the pair. If an LDEV failure occurs, the disk array suspends
disk arr
. If a PDEV failure occurs, BC pair status is not affected because of the
the pair
chitecture, but copy pace may be degraded.
RAID ar Under certain conditions, BC volume pairs may need to be re-established.
1
Maximum number of pairs per disk array depends on installed rmware version.
Maximum number of pairs for the array
When you create BC pairs, resources called differential tables arerequired. Thenumberofdifferential tables available in one disk array depends on the array's amount of shared memory for differential tables.
You can use 13,652 differential tables if no additional shared memory for differential tables is
installed.
You can use 30,718 differential tables if additional shared memory for differential tables is
installed.
NOTE:
Contact your HP account support representative for more information about adding additional shared memory.
NOTE:
The maximum number of pairs you can create is 8,192, no matter how much shared memory for differential tables is available. If a command device is installed in order to use RAID Manager, the maximum number of pairs is 8,191 (when conguring pairs of 1 P-VOL: 1 S-VOL ratio).
To calculate the maximum number of BC pairs, you must calculate how many differential tables are required to create BC pairs, and compare the result with the number of differential tables in the disk array.
llowing applications also use differential tables:
The fo
ShadowImage for z/OS
Hitachi FlashCopy Mirroring
Business Copy XP user guide
15
Hitachi FlashCopy Mirroring version 2
Flex Copy XP
Auto LUN XP
Snapshot XP
For more information, refer to the following documents:
For ShadowImage for z/OS, Hitachi FlashCopy Mirroring, and Hitachi FlashCopy Mirroring
Version 2, see the HitachiShadowImageforz/OSuser guide.
ForFlexCopyXP,see“CalculatingthemaximumnumberofFlexCopyXPcopypairs”.
For Auto LUN XP, see “Calculating the number of Auto LUN XP concurrent migration plans”.
ForSnapshotXP,seetheHP StorageWorks Snapshot XP user guide.
If BC is used in the same disk array as any of these applications, the number of available differential tables for BC pairs is the number of differential tables in the disk array minus the number of differential tables used by other applications.
If only BC uses differential tables, the following section describes how to calculate the number of differential tables required for one BC pair, and the conditions you need to consider when calculating the number of BC pairs that you can create.
NOTE:
You can use RAID Manager's inqraid command to query the number of differential tables required when you create BC pairs. You can also use this command to query the number of unused differential tables in the disk array. For more information about the inqraid command, see the
RAIDManagerXPuserguide
.
HP StorageWorks
Calculating the number of differential tables for one BC pair
When you create a BC pair, the number of required differential tables changes according to the emulation type of the volumes. Use the equations in Table 3 to calculate the total number of differential tables per pair.
16
Business Copy XP (BC) for the Array
Table 3 Total number of differential tables per pair
Emulation type
OPEN-3 OPEN-8 OPEN-9 OPEN-E OPEN-L
OPEN-V
Equation
Total number of differential tables per pair = [(X ÷ 48) + (Y x 15)] ÷ Z
(X): Volume capacity (KB)
1, 2
(Y): Number of control cylinders associated with the emulation type (see Table 4)
(Z): Number of slots that can be managed by a differential table (61,312)
NOTE:
Roundtheresultofthecalculationuptothenearestwholenumber.
For example, if the volume's emulation type is OPEN-3, and it is not a custom volume, the volume capacity (X) is the default volume size, 2,403,360 KB, and total number of differential tables is calculated as follows:
[(2,403,360÷48)+(8x15)]÷61,312=0.81860 Whenyouroundtothenearestwholenumber,theresultis1.Therefore,thetotal
number of differential tables for a pair is 1 when the emulation type is OPEN-3. Totalnumberofdifferentialtablesperpair=(X÷256)÷(Z)
(X): Volume capacity (KB)
2
(Z): Number of slots that can be managed by a differential table (61,312)
NOTE:
Roundtheresultofthecalculationuptothenearestwholenumber.
For example, if the volume capacity (X) is the maximum OPEN-V volume capacity of 3,019,898,880 KB, the total number of differential tables is calculated as follows:
(3,019,898,880 ÷ 256) ÷ 61,312 = 192.40084 Whenyourounduptothenearestwholenumber,theresultis193. Therefore,thetotal
number of differential tables for a pair is 193 when the emulation type is OPEN-V.
1
If the selected volume is a CVS (custom volume size) volume, use the capacity of the custom volume instead of the default volume capacity for the emulation type. Since the OPEN-L emulation type does not support custom volume operations, you must use the default volume capacity of OPEN-L for X.
2
1KBequals1024bytes.
Table 4 Number of control cylinders according to emulation types
Emulation type
OPEN-3
OPEN-8
OPEN-9
OPEN-E
OPEN-L 7 (5,040 KB)
OPEN-V
Number of control cylinders
8(5,760KB 27 (19,440 KB)
19 (13 ,6 80
0(0KB)
)
KB)
Table 5 shows the relationship between emulation type, capacity, and differential tables. Table 6 shows
the number of differential tables used in OPEN-V.
Business Copy XP user guide
17
Table 5 Relationship between emulation type, capacity, and differential tables
Emulation type
OPEN-3 OPEN-9
OPEN-E
OPEN-L OPEN-V
1
1GB=10243Bytes
Capacity
Does not depend on capacity Up to 2.7GB Up to 5.5GB 2 Up to 6.8GB 3 Up to 2.7GB Up to 5.5GB 2 Up to 8.4GB Up to 11.2GB Up to 13.5GB
33.9GB 13 See Table 6
1
Differential tables per pair
1 1
1
3 4 5
Table 6 Number of differential tables used in OPEN-V
Capacity
1
Differen-
Capacity
tial tables
Up to 14.9GB Up to 29.9GB 2 Up to 508.9GB Up to 44.9GB Up to 59.8GB Up to 74.8GB Up to 89.8GB 6 Up to 568.8GB 38 Up to 104.7GB Up to 119.7GB 8 Up to 598.7GB Up to 134.7GB Up to 149.6GB Up to 164.6GB Up to 179.6GB 12 Up to 658.6GB Up to 194.5GB Up to 209.5GB Up to 224.5GB Up to 239.4GB Up to 254.4GB Up to 269.4GB Up to 284.3GB Up to 299.3GB 20 Up to 778.3GB 52 Up to 1,257.3GB Up to 314.3GB Up to 329.3GB 22 Up to 803.3GB
1
3Upto523.9GB35Upto1,002.8GB67 4 5
7
9Upto613.7GB 10 Up t o 628 .7 GB 11
13 U p t o 67 3 . 5 G B 14 15 16 17 18 19
21 Up to 793.3GB 53 Up to 1,272.3GB 85
Up to 493.9GB
Up to 538.8GB 36 Up to 1,017.8GB 68 Up to 553.8GB 37 Up to 1,032.8GB 69
Up to 583.7GB 39 Up to 1,062.7GB
Up to 643.6GB 43
Up to 688.6GB Up to 703.5GB Up to 718.4GB 48 Up to 1,197.4GB Up to 733.4GB 49 Up to 1,212.4GB Up to 748.4GB Up to 763.4GB
1
Differen-
Capacity
1
tial tables
33 Up to 972.9GB 65 34
40 41 42
44 45 46 47
50 51
54
Up to 987.9GB 66
Up to 1,047.8GB
Up to 1,077.7GB 72 Up to 1,092.7GB 73 Up to 1,107.6GB U p t o 1,12 2. 6 G B U p t o 1,13 7. 6 G B 76 Up to 1,152.5GB Up to 1,167.6GB 78 Up to 1,182.5GB 79
Up to 1,227.4GB Up to 1,242.5GB
Up to 1,287.3GB 86
Differen­tial tables
70 71
74 75
77
80 81 82 83 84
18
Business Copy XP (BC) for the Array
Capacity
1
Differen-
Capacity
tial tables
Up to 344.2GB
Up to 359.2GB
Up to 374.2GB
Up to 389.1GB 26 Up to 868.1GB 58
Up to 404.1GB
Up to 419.1GB
Up to 434.0GB
Up to 449.0GB
Up to 464.0GB
Up to 478.9GB
U p t o 1, 4 51. 9G B
Up to 1,466.9GB
Up to 1,481.8GB
Up to 1,496.8GB
Up to 1,511.8GB 101 Up to 2,005.8GB
Up to 1,526.8GB 102 Up to 2,020.7GB 135
Up to 1,541.7GB
Up to 1,556.7GB
Up to 1,571.7GB 105 Up to 2,065.6GB 138 Up to 2,559.6GB
Up to 1,586.6GB 106 Up to 2,080.7GB 139
Up to 1,601.6GB 107 Up to 2,095.6GB
Up to 1,616.6GB 108 Up to 2,110.5GB
Up to 1,631.5GB 109 Up to 2,125.5GB
Up to 1,646.5GB
Up to 1,661.5GB
Up to 1,67
Up to 1,691.4GB
Up to 1,706.4GB 114 Up to 2,200.4GB 147 Up to 2,694.3GB
Up to 1,7
Up to 1,736.3GB 116 Up to 2,230.3GB
Up to 1,751.3GB
Up to 1,766.3GB 118 Up to 2,260.2GB
Up to 1,781.2GB 119 Up to 2,275.2GB 152 Up to 2,769.2GB 185
Up to 1,796.2GB 120 Up to 2,290.2GB 153
Up to 1,
Up to 1,826.1GB 122 Up to 2,320.1GB
Up to 1,841.1GB
6.4GB
21.4GB
811. 2 GB
23 Up to 823.2GB 24 25 Up to 853.2GB
27 Up to 883.1GB 59 Up to 1,362.1G 28 Up to 898.1GB 60 Up to 1,377.1GB 92 29 Up to 913.0GB 61 Up to 1,392.0GB 93 30 Up to 928.0GB 62 31 32 Up to 957.9GB 97 9 8 U p t o 1,9 6 0 . 9 G B 131 99 Up to 1,975.8GB 132 100 Up to 1,990 .
103 Up to 2,035 104
110 111 11 2 11 3
11 5
11 7
121 U p t o 2 ,
123 Up to 2,335.1GB 156 Up to 2,829.0GB 189
Up to 838.2GB 56 Up to 1,317.2GB 88
Up to 943.0GB
Up to 1,945.9GB
Up to 2,050.7GB 137
Up to 2,140.5GB 143 Up to 2,634.4GB Up to 2,155.4GB 144 Up to 2,649.4GB Up to 2,17 Up to 2,185.4GB 146
Up to 2,215.3GB
Up to 2,245.3GB
1
8GB
.7GB
0.4GB
305.1GB
Differen-
Capacity
tial tables
55
57
63 64 Up to 1,436.9GB 13 0
13 3 13 4 U p t o 2 , 4 9 9. 7 G B
13 6 U p t o 2 , 5 2 9
14 0 141 Up to 2,604.5GB 174 14 2
14 5 U p t o 2 , 6 6
14 8 149 Up to 2,724.3GB 15 0 U p t o 2 ,7 39 . 2 G B 18 3 151
15 4 15 5
Up to 1,302.2GB 87
Up to 1,332.2GB 89 Up to 1,347.1GB
Up to 1,407.0GB 94 Up to 1,422.0GB
Up to 2,439.9GB Up to 2,454.8GB 164 Up to 2,469.8GB Up to 2,484.8GB
Up to 2,514.7GB
Up to 2,544.6GB
Up to 2,574 Up to 2,589.5GB 173
Up to 2,619.5GB
Up to 2,679.3GB 179
Up to 2,709.3GB 181
Up to 2,
Up to 2,784.1GB Up to 2, Up to 2,814.1GB
1
.7GB
.6GB
4.4GB
754.2GB
799.1GB
B
Differen­tial tables
90 91
95 96 16 3
16 5 16 6 167 16 8 169 170 171 172
175 176 17 7 178
18 0
182
18 4
18 6 187 18 8
Business Copy XP user guide
19
Capacity
1
Differen-
Capacity
1
tial tables
Up to 1,856.1GB Up to 1,871.0GB 125 Up to 2,365.0GB 158 Up to 2,859.0GB 191 Up to 1,886.0GB 126 Up to 2,380.0GB 159 Up to 2,873.9GB 192 Up to 1,901.0GB 127 Up to 1,915.9GB 128 Up to 1,930.9GB 129
1
1GB=10243Bytes
12 4
Up to 2,350.0GB
Up to 2,394.9GB Up to 2,409.9GB Up to 2,424.9GB
If you intend to create pairs with volumes of different emulation types, the maximum number of pairs you can create depends on the following conditions.
NOTE:
For more information about calculating total number of differential tables per pair, see Table 3.
Calculating the number of BC pairs if LUSE is not used
Use the following equation to calculate whether the desired number of BC pairs can be created: Σ{(α) x (number of BC Pairs)} (Β), where:
Differen-
Capacity
tial tables
15 7
16 0 U p t o 2 ,8 8 0 . 0 GB 19 3 161 16 2
Up to 2,844.0GB
1
Differen­tial tables
19 0
Calculati
(α) is the required number of differential tables per pair (see Table 3).
(number of BC pairs) is the number of BC pairs you want to create.
(Β) is number of differential tables in the disk array.
•(Β) = 13,652 when additional shared memory for differential tables is not installed.
•(Β) = 30,718 when additional shared memory for differential tables is installed.
For example, if you create 10 pairs of OPEN-3 volumes and 20 pairs of OPEN-V volumes in a disk array that does not have additional shared memory for differential tables, use the following equation:
1x10+193x20=387013 , 652 Since 3,870 is less than 13,652, 10 pairs of OPEN-3 volumes and 20 pairs of OPEN-V volumes can
be created.
NOTE:
When the emulation type is OPEN-3, and the capacity of the volume is 2,403,360 KB, the number of differential tables required for a pair is 1. When the emulation type is OPEN-V, and the capacity of the volume is 3,019,898,880 KB, the number of differential tables required for a pair is193.
ng the number of BC pairs if LUSE is used
Use the fol Σ[Σ{(α)x(
lowing equation to calculate whether the desired number of BC pairs can be created:
number of volumes that form LUSE volumes)} x (number of BC pairs)] ≤ (Β), where:
(α) is the required number of differential tables for each volume that forms the LUSE volume.
When you use LUSE volumes to create a BC pair, every volume that forms the LUSE volume uses the differen created b
tial tables as a pair. For example, if you create a BC pair by using LUSE volumes that are
y combining two OPEN-V volumes, you need differential tables for two OPEN-V pairs.
(Β) is number of differential tables in the disk array.
•(Β) = 13,652 when additional shared memory for differential tables is not installed.
20
Business Copy XP (BC) for the Array
•(Β) = 30,718 when additional shared memory for differential tables is installed.
For example, if you create 10 pairs of LUSE volumes consisting of three OPEN-3 volumes, use the following equation:
(1x3)x10=3013 , 6 5 2 Since 30 is less than 13,652, 10 pairs of LUSE volumes consisting of three OPEN-3 volumes can
be created.
NOTE:
WhentheemulationtypeisOPEN-3,andthecapacityofthevolumeis2,403,360KB,thenumberof differential tables required for a pair is 1.
BC operations
Set reserve attribute operation
This operation reserves a volume so it can be used as a BC S-VOL. Reserved volumes can only be used as BC S-VOLs. The disk array rejects all write operations to reserved volumes (unless in split (PSUS) status or PSUS(SP)).Youcanreserveupto4,095volumesinonediskarray.UsetheSetReserveAttributewindow (see Setting reserve attributes) to reserve volumes for use as BC S-VOLs.
A volume might be reserved for BC to ensure that a server does not mount it before BC can use it in a pair. BC cannot use a volume as an S-VOL if it is being used by a server.
NOTE:
BC leaf volumes (L2 cascade pair) also function as S-VOLs and must be reserved prior to being assigned to an L2 cascade pair.
Reset reserve attribute operation
This operation unreserves a volume so it can be mounted and accessed by all hosts. After you reset the reserve attribute, the disk array accepts all subsequent I/O operations to the volume. Use the Reset Reserve Attribute window (see Resetting reserve attributes) to unreserve volumes.
Paircrea
te operation
This operation establishes the new BC pairs. The volume that will be the P-VOL must be in the SMPL (simplex)state,andthevolumethatwillbetheS-VOLmustbeintheSMPLstatebeforebeingaddedto a BC pair.
NOTE:
You can reserve the S-VOL before creating a pair, but you can also create a pair with an unreserved S-VOL. Use the Paircreate window (see Creating BC pairs (Paircreate)) to create new BC volume pairs.
Initial copy operation
This operation occurs when you create a new volume pair (see Figure 2). The BC initial copy operation copies all data on the P-VOL to the associated S-VOL. The P-VOL remains available to all hosts for read and write I/Os throughout the initial copy operation. After the initial copy is complete, the update copy operation duplicates write operations performed on the P-VOL during the initial copy operation at the S-VOL.
Business Copy XP user guide
21
Before the initial copy operation, the status of a pair is SMPL. The status of the pair is COPY(PD) (PD = pending) while the initial copy operation is in progress. The status changes to PAIR when the initial copy is complete. Write operations performed on the P-VOL during the initial copy operation are duplicated at the S-VOL by update copy operations after the initial copy is complete.
CAUTION:
Even if a copy operation is completed without any host I/O, the data in the P-VOL and S-VOL may not beidentical.WhethertheP-VOLandtheS-VOLhavethesamedatadependsontheconditionofthe disk array. To make the P-VOL and S-VOL data the same, split the pair and make the pair status PSUS.
NOTE:
When creating pairs, you can select the pace for the initial copy operation: slower, medium, and faster. TheslowerpaceminimizestheimpactofBCoperationsondiskarrayI/Operformance,whilethefaster pace completes the initial copy operation as quickly as possible.
Figure 2 Adding a pair in BC
Update copy operation
This operation updates the S-VOL of a BC pair after the initial copy operation is complete. Since a P-VOL remains available to all hosts for read and write I/Os during the initial copy operation, the P-VOL might be updated during the operation. Therefore, when the status of the pair changes to PAIR after the initial copy operation is complete, the update copy operation takes place and the P-VOL's differential
s copied to the S-VOL. Update copy operations take place only for duplex pairs (status = PAIR).
data i As write I/Os are performed on a duplex P-VOL, the disk array stores a map of the P-VOL's differential data, and performs update copy operations periodically based on the amount of differential data present
P-VOL and the elapsed time between update copy operations. Figure 3 illustrates an update
on the copyoperationinaBCpairwithonlyoneS-VOL.
22
Business Copy XP (BC) for the Array
CAUTION:
Even if a copy operation is completed without any host I/O, the data in the P-VOL and S-VOL may not beidentical.WhethertheP-VOLandtheS-VOLhavethesamedatadependsontheconditionofthe disk array. To make the P-VOL and S-VOL data the same, split the pair and make the pair status PSUS.
NOTE:
Update copy operations are not performed for pairs with the following status: COPY(PD) (
), COPY(SP) (
duplex
resync
), COPY(RS-R) (
(
Update copy operations do not occur every time a host issues a write I/O operation to the P-VOL of
a BC pair. BC update copy operations are performed asynchronously according to the differential bitmap, which is stored in shared memory.
If shared memory is lost (for example, ofine micro exchange or volatile PS on), the differential
bitmap is also lost. In this case, the disk array treats the entire BC P-VOL (S-VOL for COPY(RS) pairs) as difference data and recopies all data to the S-VOL (P-VOL for COPY(RS) pairs) to ensure proper pair resynchronization. For pairs with COPY(SP) or PSUS(SP) status, the disk array changes the status to PSUE due to the loss of the differential bitmap, also ensuring proper resynchronization of these pairs. If shared memory is lost, allow extra time for BC operations.
steady split pending
resync-reverse
), and PSUE (
), PSUS(SP) (
suspended
quick split pending
).
), PSUS (
split)
pending
,COPY(RS)
Figure 3 Update copy operation
Cascade function
This function creates a second layer of BC volume pairs (L2) underneath the rst layer of BC pairs (L1). Cascade
BC pair Cascad
s(Paircreate)). This cascade layering scheme creates up to nine copies of one BC P-VOL. See
efunctionfor further information on cascade pairs and the cascade function.
Pairsplit operation
The BC split capability, by making the BC copies (S-VOLs) available for host access, provides a point-in-time copy that can be used for data backup or to provide real data for test purposes. The BC pairsplit operation copies all P-VOL data or differential data to the S-VOL to make the S-VOL identical to theP-VOL.IftherearealotofhostI/OsfortheP-VOL,itmighttakelongertosynchronizetheP-VOL and S-VOL.
Use the Pairsplit window to split existing BC pairs or to add and split new BC pairs in one step. When you split an existing pair, only the differential data is copied to the S-VOL. When you create and split a
pairs are created by clicking Cascade instead of Set in the Paircreate window (see Creating
Business Copy XP user guide
23
Copy pace
Split type
new pair, all P-VOL data is copied to the S-VOL. When the split operation is complete, the pair status changes to PSUS, and you have full read/write access to the split S-VOL (even though it is still reserved).
While the pair is split, the disk array establishes a track map for the split P-VOL and S-VOL, and records a list of the changed tracks for both volumes. The P-VOL remains fully accessible during the pairsplit operation, and the accessibility of the S-VOL depends on the split type (see Split type). Pairsplit operations cannot be performed on suspended (PSUE, COPY(RS), or COPY(RS-R)) pairs.
When splitting pairs, you can select the pace for the pending update copy operation: Slower, Medium, and Faster. The slower pace minimizes the impact of BC operations on disk array I/O performance, while the fas
When splitting pairs, you can select the split type: Quick Split or Steady Split.
When you specify Quick Split, the pair status changes to PSUS(SP), and the S-VOL is available
immediately for read and write I/Os (even though it is still reserved). All P-VOL data or differential data is copied to the S-VOL in the background.
When you specify Steady Split, the pair status changes to COPY(SP), and all P-VOL data or
differential data is copied to the S-VOL. When the operation is complete, the pair status changes toPSUS,andyouhavefullread/writeaccesstothesplitS-VOL(eventhoughitisstillreserved). If you want to nish the copy operation quickly in order to access the S-VOL, take the P-VOL ofine before performing the operation.
ter pace splits the pairs as quickly as possible.
NOTE:
Refer to the Table 7 for information about read/write operations from host servers to P-VOLS and S-VOLS of BC pairs during a pairsplit operation.
Pairresync operations
To change the status of the pairs from PSUS to PAIR, or from PSUE to PAIR, you must resynchronize the pairs. BC can perform the following types of pairresync operations according to the speed and direction of the resynchronization:
Normal Copy
Quick Resync
Reverse Copy
Quick Restore
Use the Pairresync pane to resynchronize split and suspended BC pairs. When the pairresync operation starts, the pair status changes to COPY(RS) or COPY(RS-R). When the pairresync is complete, the pair status changes to PAIR. The local disk array resumes BC update copy operations after the pair status changes to PAIR. The P-VOL remains fully accessible during a normal pairresync operation, but is inaccessible to all hosts during a reverse or quick restore pairresync operation. This ensures that data on the P-VOL is identical to data on the S-VOL when the reverse or quick restore pairresync operation completes.
NOTE:
You can use BC to perform normal or quick pairresync operations on split and suspended pairs, but you can perform reverse or quick restore pairresync operations only on split pairs.
24
Business Copy XP (BC) for the Array
Forward pairre
sync operation
A forward pairr are the types o
Normal.Thisoperation(seeFigure 4) resynchronizes the S-VOL with the P-VOL. The copy
direction for a normal pairresync operation is P-VOL to S-VOL. The pair status during a normal resync operation is COPY(RS), and the P-VOL remains accessible to all hosts for read and write operations during a normal pairresync.
Quick.This
data to the S-VOL. The P-VOL and S-VOL are resynchronized when update copy operations are performed for duplex pairs (status = PAIR). The pair status during a quick pairresync operation is PSUS(SP) until the differential map is copied, and the P-VOL remains accessible to all hosts for read an pairresync operation.
esync operation resynchronizes pairs by copying data on P-VOLs to S-VOLs. The following
f forward pairresync operations:
operation speeds up the normal pairresync operation without copying the P-VOL
d write operations. The S-VOL becomes inaccessible to all hosts during a quick
re 4 Normal and quick pairresync operations
Figu
CAUTION:
Even if a copy operation is completed without any host I/O, the data in the P-VOL and S-VOL may not beidentical.WhethertheP-VOLandtheS-VOLhavethesamedatadependsontheconditionofthe
array. To make the P-VOL and S-VOL data the same, split the pair and make the pair status PSUS.
disk
Backward pairresync operation
A backward pairresync operation resynchronizes pairs by copying data on S-VOLs to P-VOLs. The following are the types of backward pairresync operations:
Business Copy XP user guide
25
Reverse. This operation (see Figure 5) synchronizes the P-VOL with the S-VOL. The copy direction
for a reverse pairresync operation is S-VOL to P-VOL. Table 7 shows the requirements for reverse and quick restore pairresync operations. If you perform these operations on pairs that do not meet the requirements, the reverse copy or quick restore command is rejected. The pair status during a reverse resync operation is COPY(RS-R), and the P-VOL and S-VOL become inaccessible to all hosts for write operations during a reverse pairresync operation. When the reverse pairresync is complete, the P-VOL becomes accessible. The reverse pairresync operation can only be performed on split pairs (PSUS status), not on suspended pairs (PSUE status). The reverse pairresync operation cannot be performed on L2 cascade pairs.
NOTE:
The P-VOL remains read-enabled during the reverse pairresync operation only to enable the host to recognize the volume. Data on the P-VOL is not guaranteed until the reverse pairresync operation is complete and the status changes to PAIR.
Quick Restore.Thisoperation(Figure 5) speeds up reverse resync by changing the volume map in
the disk array to swap the contents of the P-VOL and S-VOL without copying the S-VOL data to the P-VOL. The P-VOL and S-VOL are resynchronized when update copy operations are performed for pairs in PAIR status. The pair status during a quick restore operation is COPY(RS-R) until the volume map change is complete. The P-VOL and S-VOL become inaccessible to all hosts for write operations during a quick restore operation. Quick restore cannot be performed on L2 cascade pairs or on suspended pairs (PSUE status). Table 7 shows the requirements for reverse and quick restore pairresync operations. If you perform these operations on pairs that do not meet the requirements, the reverse copy or quick restore command is rejected.
26
Business Copy XP (BC) for the Array
Figure 5 Reverse and quick restore pair operations
NOTE:
TheP-VOLremainsread-enabledduringthequickrestoreoperationonlytoenablethehosttorecognize the volume. Data on the P-VOL is not guaranteed until the quick restore operation is complete and the status changes to PAIR.
NOTE:
When a quick restore operation is in progress, the array management user interface may display old conguration information. To update the information in the user interface, wait for the quick restore operation to nish, and click Refresh.
CAUTION:
During a quick restore operation, the RAID levels, HDD types,andCache LUN settings of the P-VOL and S-VOL are exchanged. For example, if the P-VOL has a RAID-1 level and the S-VOL has a RAID-5 level,
ck restore operation changes the P-VOL to RAID-5 and the S-VOL to RAID-1.
the qui
To avoid any performance impact due to the quick restore operation
1. Ensure that the P-VOL and S-VOL have the same RAID level and HDD type before performing the
quick restore operation. To restore the original volume designations after a quick restore, stop host I/Os to the pair, split the pair, perform the quick restore operation for that pair again, and restart host I/Os to the pair.
Business Copy XP user guide
27
2. Because Cache LUN settings are exchanged during a quick restore operation, you must perform one
of the following operations. If you do not, the change of location of cache residence areas may causeI/OperformancetotheCacheLUNdatatobedown.
• Set the same Cache LUN settings (locations) for the P-VOL and S-VOL before performing thequickrestoreoperation.
• Release the Cache LUN settings of the P-VOL and S-VOL before the quick restore operation, and reset the Cache LUN settings of the P-VOL and S-VOL after the pair changes to PAIR status as a result of the quick restore operation.
CAUTION:
If you do not want the P-VOL and S-VOL to be resynchronized after the quick restore operation, set the Swap&Freeze option before performing the quick restore operation (see Swap&Freeze option).
Table 7 shows the requirements for reverse and quick restore pairresync operations. If you perform these
operations on pairs that do not fulll the requirements, the reverse copy or quick restore command is rejected.
Table 7 Requirements for reverse or quick restore pairresync operations
Parameter
Pair status
Pair type
Shared BC/Continuous Access XP volume
Shared BC/Continuous Access XP Journal volume
Requirements
The specied pair must be in the PSUS state. All other pairs sharing the same P-VOL as the specied pair must also be in the PSUS or PSUE state.
Whether you can execute a quick restore command for a pair consisting of customized and normal volumes depends on the volume's emulation type.
If BC and Continuous Access XP pairs share the same volume, and the Continuous Access XP pair is not suspended, you cannot perform reverse and quick restore pairresync operations.
If the BC and Continuous Access XP Journal pairs share the same volume, and the Continuous Access XP Journal pair is not suspended, you cannot perform the reverse and quick restore pairresync operations.
NOTE:
A Continuous Access XP Journal P-VOL means a Continuous Access XP Journal primary data volume. A Continuous Access XP Journal S-VOL means a Continuous Access XP Journal secondary data volume.
CAUTION:
If a reverse or quick restore resync operation ends abnormally, or a Pairsplit-E (PSUE) is requested during a reverse or quick restore resync operation, the status of other BC pairs sharing the same P-VOL does not change.
NOTE:
When a reverse or quick restore pairresync operation is in progress, you cannot perform paircreate, pairsplit, or pairresync operations for any other pairs sharing the same P-VOL (pairsplit-S and pairsplit-E are allowed).
28
Business Copy XP (BC) for the Array
Figure6BCP-VOLformingpairwithContinuousAccessXPS-VOLandexternalS-VOL, respectivel
y
Figure 7 BC P-VOL forming pair with external S-VOL and shared as Continuous Access XP S-VOL
Figure 8 BC S-VOL forming pair with external P-VOL and shared as Continuous Access XP P-VOL
Figure 9 BC P-VOL forming pair with CA XP Jou. S-VOL and Ext. S-VOL, respectively
Figure 10 BC P-VOL forming pair with external S-VOL and shared as Continuous Access XP Journal S-VOL
Use the Pairresync window to resynchronize split and suspended BC pairs. When the pairresync operation starts, the pair status changes to COPY(RS) or COPY(RS-R). When the pairresync is complete, the pair
Business Copy XP user guide
29
status changes to PAIR. The disk array resumes BC update copy operations after the pair status changes to PAIR. The P-VOL remains fully accessible during a normal pairresync operation, but becomes inaccessible to all hosts during a reverse or quick restore pairresync operation. This ensures that data on the P-VOL is identical to data on the S-VOL when the reverse or quick restore pairresync operation completes.
Pair status and time required for pairresync
The pairresync operation can be performed on a split pair or suspended pair. This section describes the relationship
Pairresync for split pair. When a normal/quick pairresync operation is performed on a split pair
(status = PSUS), the disk array copies all agged tracks from the P-VOL to the S-VOL. When a reverse or quick restore pairresync operation is performed on a split pair, the disk array copies all agged trac resynchronized in the desired direction, and greatly reduces the time needed to resynchronize the pair.
Pairresync
suspended pair (status = PSUE), the disk array copies all data on the P-VOL to the S-VOL, because all P-VOL tracks were agged as difference data when the pair was suspended. Reverse and quick restore pairresync operations cannot be performed on suspended pairs. The normal pairresync operation
between the pair status and the time required for pairresync operations.
ks from the S-VOL to the P-VOL. This ensures that the P-VOL and S-VOL are properly
for suspended pair. When a normal/quick pairresync operation is performed on a
for suspended pairs is equivalent to and takes as long as the BC initial copy operation.
If you perf be performed and all the data will be copied to the S-VOL. In this case, the update copy operation maytakemuchmoretimethantheinitialcopyoperation.
CAUTION:
When resy faster. T pace resynchronizes the pairs as quickly as possible, but it may affect the disk array's I/O performance.
orm the quick pairresync operation on the suspended pairs, the update copy operation will
nchronizing pairs, you can select the pace for the pairresync operation: slower, medium, or
he slower pace minimizes the impact of BC operations on subsystem I/O performance. The faster
Pairsplit-E operation (suspend)
This operation suspends the BC copy operations to the S-VOL of the pair. You can suspend a BC pair at any time. When a BC pair is suspended (status = PSUE), the disk array stops performing BC copy operations to the S-VOL, continues accepting write I/O operations to the P-VOL, and marks all P-VOL tracks as difference data. When a pairresync operation is performed on a suspended pair, the entire P-VOL is copied to the S-VOL. While the pairresync operation for a split BC pair can be very fast, the pairresync operation for a suspended pair takes as long as the initial copy operation. The reverse and quick restore pairresync operations cannot be performed on suspended pairs.
ThediskarrayautomaticallysuspendsaBCpairwhenitcannotkeepthepairmirroredforanyreason. When the disk array suspends a pair, sense information is generated to notify the host. The disk array automatically suspends a pair under the following conditions:
When the volume pair has been suspended (PSUE) or deleted (SMPL) from an open system host
using the RAID Manager command line interface.
When the disk array detects an error condition related to an initial copy operation. When a
volume pair with COPY(PD) status is suspended (PSUE), the disk array aborts the initial copy operation, changes the status of the P-VOL and S-VOL to SMPL, accepts all subsequent write I/Os to the S-VOL, and does not keep track of updates.
When the disk array detects an error condition related to an update copy operation.
When the P-VOL and/or S-VOL track map in shared memory is lost (for example, due to ofine
microprogram exchange). This applies to COPY(SP) and PSUS(SP) pairs only. For PAIR, PSUS, COPY(RS),orCOPY(RS-R)pairs,thepairisnotsuspended,buttheentireP-VOL(S-VOLforreverse or quick restore pairresync) is marked as difference data.
30
Business Copy XP (BC) for the Array
Use the Pairsplit-E window to suspend BC pairs. When a pair is suspended, the status changes to PSUE. When the pairresync operation starts, the pair status changes to COPY(RS). The P-VOL remains fully accessible while suspended and during the pairresync operation.
Pairsplit-S operation (delete)
This operation stops BC copy operations to the S-VOL of the pair and changes the pair status of both volumes to SMPL. The volumes are not deleted. A BC pair can be deleted at any time except during the quick pairsplit operation (or any status except SMPL status and PSUS(SP) status). After you delete a BC pair, the S-V
OLisstillnotavailableforwriteoperationsuntilthereserveattributeisreset.
Use the Pairsplit-S window to delete BC pairs. When a BC pair is deleted, pending update copy operations for the pair are discarded, and the status of the P-VOL and S-VOL is changed to SMPL.
CAUTION:
The S-VOL of a duplex pair (PAIR status) may not be identical to its P-VOL due to the asynchronous BC update cop
yoperations.
BC options
Use the BC options to extend standard BC operations such as the paircreate and pairresync operations. The following table lists the options that are currently available.
Table 8 BC options types and requirements
Option type
Swap&Freeze
Host I/O Performance
NOTE:
The number of available option types depends on the disk array's settings.
Swap&Freeze option
This option allows the S-VOLs of a BC pair to remain unchanged after the quick restore operation. If the quick restore operation is performed on a BC pair with the Swap&Freeze option, update copy operations are suppressed for pairs in PAIR status after the quick restore operation. If the quick restore operation is performed without the Swap&Freeze option, the P-VOL and S-VOL are resynchronized when update copy operations are performed for pairs in PAIR status.
The following gure shows the state of the S-VOL after the quick restore operation with or without the Swap&Freeze option.
Features
Suppresses the update copy. See Swap&Freeze option.
Suppresses the BC copy operations. See Host I/O Performance option.
Requirement
You must change disk array setting to enable the quick restore operation.
Business Copy XP user guide
31
Figure 11 Quick Restore operation with or without Swap&Freeze option
The Quick Restore pairresync operation on a pair with status of PSUS exchanges data in the pair's P-VOL and S-VOL. If you use the Swap&Freeze option when performing the Quick Restore pairresync operation, the update copy operation will not take place after the Quick Restore pairresync operation is complete. Therefore, data on the P-VOL and S-VOL is kept exchanged. If you do not use the Swap&Freeze option when performing the Quick Restore pairresync operation, the update copy operation will take place after the Quick Restore pairresync operation is complete, and data on the P-VOL overwrites data on the S-VOL.
Host I/O
Performance option
This opt Perfor host I/
When BC copy processing is suppressed, the time taken for copying increases. Also, if ShadowImage for z/OS pairs exist, host I/O responses might not be faster. In this case, set the Host I/O Performance option for ShadowImage for z/OS as well.
ion prioritizes host I/O responses over BC copy processing time. When you use the Host I/O
mance option, the disk array suppresses execution of BC copy processing, and consequently
O responses improve.
Cascade function
This function creates a second layer of volume pairs underneath the rst layer of BC pairs. Pairs created in the rst and second layer are called cascaded pairs. Figure 12 illustrates cascaded BC volume pairs. The rst cascade layer (L1) is the original BC pair, consisting of one P-VOL (root volume) and up to three S-VOLs (node volumes). In the second cascade layer (L2), the S-VOLs of the original BC pair function as the P-VOLs of the L2 pairs, and each L2 P-VOL can have up to two S-VOLs (leaf volumes). This layering schemecancreateuptoninecopiesofoneBCprimaryvolume(P-VOL).
Every volume can have up to three Mirror Unit (MU) numbers associated with it. The MU number designates a pair for which the volume is a member. The MU number is not the number of the pair, but the number of the volume. A pair is made up of two volumes of which each pair member could have the same or different MU numbers.
MU=0 is the number of a volume for its rst pair.
MU=1 is the number of the same volume for its next pair.
MU=2 is the number of the same volume for its third pair.
The MU number of an S-VOL is always MU=0.
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Business Copy XP (BC) for the Array
For Level 1 (L1) pairs, the root volume could have MU=0, MU=1, and MU=2. For L1 pairs, the associated S-VOLs all have MU=0 because this is the rst pair of which they are a member.
For the Level 2 (L2) pairs, the L1 S-VOLs are now all acting as L2 P-VOLs. Because they are already a member of one pair, the next MU number for each of them is MU=1 for their rst L2 pair and MU=2 for their second L2 pair. For the S-VOLs associated with each of these pairs, the MU number is once again MU=0becausethisistherst pair of which they are a member.
Figure 12 Cascade pairs
When L1 and L2 cascade pairs are created, the P-VOLs and S-VOLs of the cascade pairs are classied using the following terms (as shown in the previous gure):
The root volume is the P-VOL of the L1 pair, which is the original BC pair. You can add up to
three S-VOLs (node volumes) to a root volume.
The node volume is the S-VOL (reserved) of an L1 pair and the P-VOL of an L2 pair. You can add
up to two S-VOLs (leaf volumes) to a node volume.
The leaf volume is the S-VOL (reserved) of an L2 cascade pair.
Table 9 shows the relationship between L1 pair status and availability of BC pair operations on the
associated L2 pairs. To split an L2 pair, you must rst split the L1 pair (L1 status = PSUS). The reverse and quick restore pairresync operations cannot be used for L2 pairs. Table 10 shows the relationship between L2 pair status and availability of pair operations on the associated L1 pairs. (CMD RJT = command rejected.) If you delete an L1 pair containing an L2 pair, the L2 pair becomes the L1 pair.
Business Copy XP user guide
33
NOTE:
Combining L1 and L2 pairs with Continuous Access XP volumes is allowed; however, Continuous
AccessXPconsidersnodeandleafvolumesassecondaryvolumes(S-VOLs).
When a P-VOL is paired with more than one S-VOL, the disk array assumes there are the same
numberofvirtualP-VOLs.Forexample,whenaP-VOLispairedwiththreeS-VOLs,thereisonly onerealP-VOL,butthediskarrayassumestherearethreevirtualP-VOLs.AVirtualP-VOLis called an MU (Mirror Unit).
“MU#” in Figure 12 means MU number, which identies each MU. MU#=1 under S-VOL1 means
the MU number of the P-VOL that is paired with the S-VOL1 is 1.
Table 9 Relationship between L1 pair status and L2 pair operations
L1 Pair Status
COPY(PD) OK
PAIR
COPY(SP) OK
PSUS(SP) OK
PSUS OK OK OK
COPY(RS) OK
COPY(RS-R) OK
PSUE OK
L2 Pair Operations Paircreate
OK
Pairsplit
NO (CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
Pairresync
OK
OK
OK
OK
OK
OK
OK
Reverse/ Quick Restore
NO (CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
Pairsplit-E Pairsplit-S
OK OK
OK OK
OK OK
OK OK
OK OK
OK OK
OK OK
OK OK
Table 10 shows the relationship between the L2 pair status and availability of pair operations on the
associated L1 pairs. (CMD RJT = command rejected.) If you delete an L1 pair containing an L2 pair, the L2 pair becomes the L1 pair.
34
Business Copy XP (BC) for the Array
Table 10 Relationship between L2 pair status and L1 pair operations
L2 Pair Status
L1 Pair Operations Paircreate
Pairsplit
Pairresync
Reverse/
Pairsplit-E Pairsplit-S Quick Restore
COPY(PD) OK PAIR COPY(SP)
PSUS(SP)
PSUS OK COPY(RS) OK COPY(RS-R)
PSUE OK
1
MU#ofL2nodepairmembermustbe1or2.
2
Not displayed by the array management interface.
1, 2
1, 2
OK
2
NO (CMD RJT)
2
NO (CMD RJT)
1, 2
1, 2
2
NO (CMD RJT)
1, 2
OK OK OK OK OK OK OK OK OK OK
2
NO (CMD RJT)NO(CMD RJT)
2
NO (CMD RJT)NO(CMD RJT)
NO (CMD RJT)
NO (CMD RJT)
OK OK
OK OK
OK OK OK OK OK OK OK OK OK OK NO
2
————
(CMD RJT) OK OK OK OK OK
The read/write operation to each volume (root, node, or leaf) from the host is enabled or disabled depending on the status of L1/L2 pairs. The read/write operation from the host can always be performed to the root volume regardless of the status of L1/L2 pairs. Table 11 shows the relationship between read/write operations from host to node volume and status of L1/L2 pairs. Table 12 shows the relationship between read/write operations from host to leaf volume and L2 pair status.
Table 11 Read/write operation (host to the node volume) and L1/L2 pair status
L1 Pair Status
L2 Pair Status COPY(PD)
PAIR
COPY(SP)
PSUS(SP)/
COPY(RS) PSUE PSUS
COPY(PD) PAIR COPY(SP) PSUS(SP)/
PSUS COPY(RS) COPY(RS-R) PSUE
Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read/ Write Read/ Write Read/ Write Read/ Write Read/ Write Read/ Write
Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only Read Only
Table 12 indicates the relationship between the read/write operation from the host to the leaf volume
and the L2 pair status.
Business Copy XP user guide
35
Table 12 Read/write operation (host to the leaf volume) and L2 pair status
COPY
Read Only Read Only Read Only
At-Time Split function
In the past, a BC pair group split each LUN pair in the group at a slightly different time. If the application data spanned multiple LUNs in the group, there was the chance of data corruption unless the application wasstoppedbeforethesplit. WiththeAt-TimeSplitfunction,LUNpairsaresplitatthesametimewithin the group, which keeps data consistent without having to stop the application.
At this time, the At-Time Split operation is performed using RAID Manager on the UNIX/PC server host. You can use Command View XP or XP Remote Web Console to perform BC pair operations for At-Time Split pairs XP Remote Web Console is disabled.
A BC consistency group (CTG) is a user-dened set of BC volume pairs used for the At-Time Split function. This function creates S-VOLs of all P-VOLs in the same consistency group when the pairsplit command is e
BC consistency groups and the At-Time Split function have the following restrictions:
You can congure up to 128 consistency groups in a disk array, including BC consistency groups.
Anumber(0
number whe number automatically.
You can dene up to 4,096 BC pairs in a consistency group. However, for LUSE volumes
containing n LDEVs, you should count as n volumes. For more information about LUSE volumes, see the HP StorageWorks LUN Conguration and Security Manager XP user guide for the XP12000/XP10000.
BC pairs
To congure BC consistency groups, use the RAID Manager software. However, to conrm the BC
consistency group numbers, use BC (see Volume list).
created by RAID Manager. However, the At-Time Split option in Command View XP or
xecuted.
–127) is assigned to each consistency group. You can specify a consistency group
n you create BC pairs. If you do not specify a number, the disk array assigns a
and ShadowImage pairs cannot co-exist in the same consistency group.
L2 Pair Status PAIR
COPY(SP)
PSUS(SP)/ PSUS
Read/Write
COPY(RS) PSUE
Read Only Read Only
When the At-Time Split function is enabled, data in all P-VOLs in the same consistency group is copied to the corresponding S-VOLs when the disk array receives the pairsplit request from the host server. The following gure shows an overview of the At-Time Split function.
36
Business Copy XP (BC) for the Array
Figure 13 Overview of At-Time Split function
Enabling the At-Time Split function using RAID Manager
1. Create BC At-Time Split pairs as follows:
a. Dene a consistency group for BC pairs. You cannot dene L1 and L2 cascade pairs (see
Cascade function) sharing the same node volume in a consistency group. If you specify such
pairs in the same consistency group, the paircreate command will be rejected.
b. Specify the At-Time Split option. c. Execute the paircreate command.
2. Execute the pairsplit command on the new BC At-Time Split pairs.
The At-Time Split option is enabled, and data in all P-VOLs in the same consistency group is copied to the corresponding S-VOLs when the disk array receives the pairsplit request.
NOTE:
You can perform BC pair operations (see Performing BC operations)fromtheCommandViewXP
managementstationorXPRemoteWebConsoleontheBCAt-TimeSplitpairscreatedbyRAID Manager;however,theAt-TimeSplitoptionisdisabled(thepairsplitoperationdoesnotensure creatingSVOLsoftheP-VOLsinthesameconsistencygroups).
When the RAID Manager pairsplit operation ends abnormally, all BC pairs in the same consistency
group are suspended (status = PSUE).
When the host server is down or has failed, a consistency group with no BC pairs can be dened. If
youexecutethepaircreatecommandwiththeAt-TimeSplitoption(-m)undertheseconditions,the paircreate command might be rejected. In this case, rst ndaconsistencygroupnumberthatisnot used by any pairs on the BC main screen by sorting the CTG column (see Volume list). Next, specify theconsistencygroupnumberexplicitly,andexecutethepaircreatecommandwiththeAt-TimeSplit option using RAID Manager on the host server.
Do not mix pairs created with the At-Time Split option and pairs not created with the At-Time Split
option in the same group dened in the RAID Manager conguration le. If you mix these two types of pairs, the pairsplit operation might terminate abnormally, or the S-VOLs of the P-VOLs in the same consistency group might not be created correctly when the pairsplit request is received.
If you use the At-Time Split function to split a pair, you can select Quick Split or Steady Split.
Business Copy XP user guide
37
NOTE:
After the pairsplit, response time of the rst I/O to each logical unit (LU) can be up to approximately ve seconds in the worst case. This worst case should be in a one-to-three BC pair situation and 36 LDEV LUSE conguration.
Pair status
The BC remote console software displays the pair status of all BC volumes (LUs) on the specied port of the connected disk array. The following gure shows the BC pair status transitions and the relationship between pair status and BC operations.
Figure 14 BC pair status transitions
The following describes BC pair status conditions:
1. IfavolumeisnotassignedtoaBCpair,itsstatusisSMPL.
2. Select the SMPL volumes for the P-VOL and S-VOL to create a BC pair. When you create a BC
pair, the initial copy operation starts. During the initial copy operation, the status of the P-VOL and S-VOL changes to COPY(PD).
3. When the initial copy operation is complete, the pair status becomes PAIR, and the differential data
between the P-VOL and the S-VOL is copied by the update copy operation.
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Business Copy XP (BC) for the Array
4. The following are the types of pair status (PSUS and PSUE) when the pair is not synchronized:
• When you split a pair (pairsplit), the pair status changes to COPY(SP) or PSUS(SP) for quick
pairsplit. During the pairsplit process, the pair status becomes COPY(SP). If you specify Quick Split pairsplit, the pair status becomes PSUS(SP) during the process. When the pairsplit operation is complete, the pair status changes to PSUS and you can access the split S-VOL. The update copy operation is not performed on pairs with status of PSUS.
• If the disk array cannot maintain PAIR status for any reason or if you suspend the pair
(pairsplit-E), the pair status changes to PSUE.
NOTE:
• When you specify reverse or quick restore mode for a pairresync operation, the pair
status changes to COPY(RS-R) (data is copied in the reverse direction from the S-VOL to the P-VOL). For more information about pairresync operation settings, see Pairresync
operations.
• When you delete a pair (pairsplit-S), the pair status changes to SMPL. You cannot
delete a pair with status of PSUS(SP).
5. When you start a pairresync operation, the pair status changes to COPY(RS) or COPY(RS-R). When
the pairresync operation is complete, the pair status changes to PAIR.
Business Copy XP user guide
39
Table 13 BC pair status conditions
Pair Status Description S-VOL Access
SMPL
COPY(PD)
PAIR
COPY(SP)
PSUS(SP)
PSUS
RS)
COPY(
COPY(RS-R)
PSUE
The volume is no read and write I/Os for all SMPL volumes that are not reserved.
Theinitialcopyoperationisinprogress. Thediskarray continues to accept read and write operations for the P-VOL, but stops accepting write operations for the S-VOL. No update copy operations are performed.
The initial copy operation is complete, and the disk array performs asynchronous update copy operations from the P-VOL to the S-VOL as needed. The P-VOL and S-VOL of a duplex pair (PAIR status) may not be identical. The disk array rejects all write I/Os for S-VOLs with status PAIR.
The status selected f the pairsp updates a the P-VOL I/Os for C
The status becomes PSUS(SP) when the quick split mode is selected for the pairsplit operation. Only the P-VOL differential data is copied to the S-VOL in the background. The disk array accepts writes for PSUS(SP) S-VOLs. PSUS(SP) pairs cannot be deleted.
The disk array stops update copy operations for PSUS (split) pairs, and starts accepting write I/Os for PSUS S-VOLs. The disk array keeps track of all updates to the split P-VOL and S-VOL, so the pair can be resynchronized quickly.
The disk array does not accept write I/Os for COPY(RS) S-VOLs. When a split pair is resynchronized in normal mode, the disk array copies only the P-VOL differential data to the S-VOL. When a PSUE (suspended) pair is resynchronized, the disk array copies the entire P-VOL to the S-VOL. No update copy operations are performed during the pairresync operation.
The disk array does not accept write I/Os for COPY(RS-R) S-VOLs. When a split pair is resynchronized in reverse or quick restore mode, the disk array copies only the S-VOL differential data to the P-VOL. No update copy operations are performed during the reverse or quick restore pairresync operation.
The disk array continues accepting read and write I/Os for a PSUE (suspended) P-VOL, but does not perform update copy operations for a PSUE S-VOL. The disk array marks the entire P-VOLtrackmapasdifferencedata,sotheentireP-VOLis copied to the S-VOL when the PSUE pair is resumed. Use the pairresync command to resume a PSUE pair.
t assigned to a BC pair. The disk array accepts
becomes COPY(SP) when the steady split mode is
or the pairsplit operation. All P-VOL updates prior to
lit command are copied to the S-VOL. When these
re complete, the split S-VOL is identical to the state of
when the split started. The disk array rejects all write
OPY(SP) S-VOLs.
N/A (there is no S-VOL yet).
Read only.
Read only.
Read only.
Read and write. The S-VOL can be mounted.
Read and write. The S-VOL can be mounted.
nly.
Read o
Read only.
Read only.
Cautions on switching off the power supply
To switch off the power supply of the disk array during BC operations, make sure to:
Complete copying for the BC pair in COPY(SP) or PSUS(SP) status rst to change the pair status
from COPY(SP) or PSUS(SP) to PSUS, and then switch off the power supply. If shared memory is volatilized when you switch on the power supply again, the pair in COPY(SP) or PSUS(SP) status changes to PSUE.
40
Business Copy XP (BC) for the Array
NOTE:
If the shared memory is volatilized when you switch on the power supply again, the pair in the COPY(SP) or PSUS(SP) status changes to PSUE.
NOTE:
If the status of only a part of the pairs in the same consistency group is changed, the processing of At-Time Split function may not resume when you switch on the power supply, and the status of some pairs may remain unchanged.
Establish a timetable for BC copying operations. If shared memory is volatilized when you switch
on the power supply again, the following conditions occur:
• If the BC pair was in COPY(PD) or COPY(SP) status, data already copied becomes target data
to be copied after the power supply is switched back on. Even if there is no host I/O, the data consistency pair status changes to PAIR, target data is copied to the secondary volume.
• If the BC pair was in PAIR status, data already copied becomes target data to be copied after
the power su target data is copied to the S-VOL.
• If the BC pair was in PSUS status, the entire volume becomes differential data. In this case,
the data con when you perform the pairresync operation.
rate does not reach 100% when the BC pair status changes to PAIR. When the BC
pply is switched back on. In this case, the data consistency rate is 0%, and
sistencyrateis0%,andtheentirevolumeiscopiedtothesecondaryvolume
Cautions on using the XP10000
The XP10000 has a fewer processors than the XP12000. Therefore, BC copy processing sometimes takes a long time and host I/O performance may degrade. Consider the following:
Copy processing
When you use BC on the XP10000, copy processing time (such as pair creation, pair split, and pair resynchronization) might take longer compared to when you use BC on the XP12000. Copy processing time changes according to the number of pairs, and sometimes the XP10000 requires two to eight times the copy processing time compared to the XP12000.
Host I/O performance
Since BC copy processing uses processors, host I/O performance might degrade during copy processing. The number of processors in the XP10000 is small, therefore, when you use the XP10000, the impact of copy processing on host I/O performance is larger than when you use the XP12000. To mitigate host I/O performance degradation, reduce the copy pace or use the Host I/O Performance option.
For more information about specifying the copy pace, see Copy Pace list. For more information about theHostI/OPerformanceoption,seeHost I/O Performance option.
Preparing for BC operations
System requirements
BC operations involve the disk array containing the primary and secondary volumes and the licensed BC feature enabled on the Command View XP management station or XP Remote Web Console. System requirements for BC are:
Disk array hardware, microcode, and software required for BC operations must be installed
and enabled.
Business Copy XP user guide
41
Command View XP management station (user-supplied Windows-based PC) or XP Remote
Web Console.
BC license key installed.
Preparing for BC operations
To ensure that you and your disk arrays are ready for BC operations, perform the following tasks:
BC operations affect I/O performance of the disk array because of copy operations to the
S-VOLs. If you performance and the BC backup copies. For example, assigning three S-VOLs to each P-VOL takes more resources than assigning one or two. You can also use the copy pace option to control the impact of BC initial copy operations. Using a slower copy pace minimizes the impact of BC operations on I/O performance, while a faster copy pace produces copies more quickly, but may affe
If you are using more than one disk array data management feature (such as BC, Continuous
Access XP, or Cache LUN) at the same time in the same disk array, contact your HP account support re concurren operation of other features. For example, BC and Continuous Access XP operations both involve initial copy and update copy operations to secondary/remote volumes in addition to host I/O workload
Identify the volumes (LUs) you will use for BC operations. For each volume, write down the full
SCSI path (port, target ID (TID), and LUN), whether the volume will be a P-VOL or S-VOL, and the other volumes in its pair (see Table 14 for a sample). LUN Manager displays this information. Volumes that will be P-VOLs remain fully accessible to all hosts throughout normal BC operations, but volumes that will be S-VOLs must be unmounted before being reserved for BC operations.
have not already done so, consider the relative importance of the disk array's I/O
ct I/O performance.
presentative to ensure that your disk array is optimized for your conguration of
t operations. Each disk array feature can affect disk array performance and/or
.
Table 14 Identifying the volumes for BC operations
CU
0
0
etc. 0
0
etc. 0
0
etc. 0 0
Port TID:
LUNL1P-VOL
0:00
1A
0:01
1A
1B
0:00
1B
0:01
0:00
2A
0:0
2A
0:00
3A
0:
3A
01
Yes
Yes
No
No
No
1
No
No No
Assoc. L1 S-VOLs
1B-0:00, 2A-0:00, 2B-0:00
01,
1B-0:
01,
2A-0:
01
2B-0:
— —
L1 S-VOL
No
No
Yes
Yes
Yes
Yes
No No
Assoc. L1 P-VOL
1A-0:00
:01
1A-0
1A-0:00
1A-0:01
— —
L2 P-VOL
No
No
Yes
Yes
Yes
Yes
No No
Assoc. L2 S-VOLs
3A-0:00, 3A-0:01
3B-0:00, 3B-0:01
4A-0:00, 3B-0:01
4B-0:00, 3B-0:01
— —
L2 S-VOL
No
No
No
No
No
No
Yes
s
Ye
Assoc. L2 P-VOL
1B-0:00
-0:00
1B
42
Business Copy XP (BC) for the Array
Combining BC wit
h other data management operations
BC supports con
LU Size Expansion (LUSE). LUSE volumes can be assigned to BC pairs if the P-VOL and S-VOL
have the same LU type and number of LDEVs (same size). If you must perform LUSE operations on an existing BC P-VOL or S-VOL, delete the pair rst to return the volume to SMPL status.
CVS. CVS volum
If you must per to return the volume to SMPL status.
LUN Security. LUN Security operations do not affect BC operations. Volumes under secure
ports and/or assigned to BC pairs. Volumes assigned to BC pairs can also be assigned to secure ports, WWN groups, and/or LUN groups for LUN Security.
NOTE:
BC S-VOLs cannot be accessed by any host except when the pair is split.
Cache LUN. Cache LUN volumes can be assigned to BC pairs. Cache LUN operations can be
performed on BC P-VOLs and S-VOLs.
CAUTION:
See Pairresync operations for important information on performing quick restore operations on Cache LUN volumes.
Continuous Access XP Journal. Continuous Access XP Journal volumes can be assigned to BC
pairs, and BC volumes can be assigned to Continuous Access XP Journal pairs.
Continuous Access XP. Continuous Access XP volumes can be assigned to BC pairs, and BC
volumes can be assigned to Continuous Access XP pairs. See Combining BC and Continuous
Access XP operations for important information on BC and Continuous Access XP shared volume
congurations.
Auto LUN. BC can be assigned to Auto LUN migration volumes. However, if the BC P-VOL is
already paired with three S-VOLs, delete the BC pairs before migrating the volumes. Also, to assign BC volumes to destination migration volumes or reserve BC volumes for Auto LUN, delete the BC volumes or unreserve the BC volumes before using them with Auto LUN. If you assign a BC P-VOL that is already paired with three S-VOLs to Auto LUN migration volumes, or assign BC volumes to Auto LUN volumes other than migration volumes, the command will be rejected.
current operations with the following data management functions:
es can be assigned to BC pairs if the S-VOL has the same capacity as the P-VOL.
form CVS operations on an existing BC P-VOL or S-VOL, delete the pair rst
assignedtoWorldWideName(WWN)groupsand/orLUNgroupscanalsobe
If you split the BC pair assigned to Auto LUN migration volumes, migration of those volumes will be canceled.
NOTE:
You cannot use Auto LUN migration, destination, and reserved volumes for BC pair operations (the command will be rejected). To use Auto LUN volumes for BC pair operations, use Auto LUN to release the volumes.
LUN Security XP Extension.
External Storage XP. BC operations can be performed with External Storage XP operations to
create pairs with the external volumes.
Combining BC and Continuous Access XP Journal operations
Continuous Access XP Journal volumes can be assigned to BC pairs, and BC volumes can be assigned to Continuous Access XP Journal pairs.
Business Copy XP user guide
43
BC and Continuous Access XP Journal can function together in the same Local disk array to provide both internal and remote backup for your important data.
NOTE:
A primary volume (P-VOL) of Continuous Access XP Journal means a primary data volume of
Continuous Access XP Journal. A secondary volume (S-VOL) of Continuous Access XP Journal means a secondary data volume of Continuous Access XP Journal.
Combining BC L1 and L2 pairs with Continuous Access XP Journal volumes is allowed. Continuous
Access XP Journal considers node and leaf volumes as secondary volumes (S-VOLs).
The conguration shown in Figure 15 is an example of a volume that functions as both a Continuous Access XP Journal P-VOL and a BC P-VOL. This conguration allows you to:
Use BC to provide on-site backup copies of Continuous Access XP Journal P-VOLs
Use Continuous Access XP Journal to provide remote backup copies of BC P-VOLs
Figure 15 BC and Continuous Access XP Journal: Shared P-VOL and P-VOL
CAUTION:
When you share a BC P-VOL with a Continuous Access XP Journal S-VOL as shown in Figure 16,the write operation to the Continuous Access XP Journal P-VOL takes time. Especially, when the BC pair is in the PSUS(SP) status, the write operation to the Continuous Access XP Journal P-VOL may take extra time due to the time for copying to the BC pair. In addition, if the journal volume size is small, the Continuous Access XP Journal pair may be suspended and fail due to a shortage of the capacity of its journal volume.
The conguration shown in Figure 16 is an example of a volume that functions as both a Continuous Access XP Journal S-VOL and a BC P-VOL. This conguration allows you to use BC to provide remote copies of Continuous Access XP Journal S-VOLs.
44
Business Copy XP (BC) for the Array
Figure 16 BC and Continuous Access XP Journal: Shared P-VOL and S-VOL
Figure 17 is an example of a volume that functions as both a Continuous Access XP Journal P-VOL and a
BC P-VOL, while the S-VOL of the same Continuous Access XP Journal pair also functions as the P-VOL of another BC pair. This conguration allows you to:
Use BC to provide on-site backup copies of Continuous Access XP Journal P-VOLs and S-VOLs
Use Continuous Access XP Journal to provide remote backup of BC P-VOLs
Figure 17 BC and Continuous Access XP Journal: Shared P-VOL and P-VOL and P-VOL and S-VOL
NOTE:
In the co Access X Busine
nguration shown in Figure 17, you cannot perform the Business Copy XP and Continuous
P Journal copy operations at the same time. In Figure 17, rst you need to create and split the
ss Copy XP pair, then create the Continuous Access XP Journal pair. If you want to resynchronize the Business Copy XP pair, suspend the Continuous Access XP Journal pair beforehand. Note that you cannot change the Continuous Access XP Journal pair status while the Business Copy XP pair is in PS
US(SP) status.
NOTE:
Usually Continuous Access XP and Continuous Access XP Journal can share volumes with BC. However, in some cases, you cannot create BC pairs using volumes shared with Continuous Access XP and Continuous Access XP Journal. For more information about combining BC, Continuous Access XP, and Continuous Access XP Journal, see Figure 22 and Figure 23.
Business Copy XP user guide
45
Combining BC an
d Continuous Access XP operations
BC and Continuo and remote bac
NOTE:
BC is recommended for intra-disk array copy operations. If BC is not installed, use Continuous
Access XP (syn conguration requires at least one external ESCON® cable loop (minimum of two is recommended).
Combining BC L1 and L2 pairs with Continuous Access XP volumes is allowed. Continuous Access XP
considersnodeandleafvolumessecondaryvolumes(S-VOLs).
NOTE:
Reverse resync and quick restore operations cannot be performed on BC/Continuous Access XP shared volume pairs.
The conguration shown in Figure 18 is an example of a volume functioning as both a Continuous Access XP P-VOL and BC P-VOL. With this conguration, you can perform the following:
Use BC to provide on-site backup copies of Continuous Access XP P-VOLs
Use Continuous Access XP to provide remote backup copies of BC P-VOLs
us Access XP can function together in the same disk array to provide both internal
kup for important data.
chronous only) to copy within the same local disk array. This Continuous Access XP
Figure 18 BC and Continuous Access XP: shared P-VOL/P-VOL
The conguration shown in Figure 19 is an example of a volume functioning as both a Continuous Access XP S-VOL and BC P-VOL. With this conguration, you can use BC to provide remote copies of Continuous Access XP S-VOLs.
46
Business Copy XP (BC) for the Array
Figure 19 BC and Continuous Access XP: shared P-VOL/S-VOL
CAUTION:
When you shar
eaBCP-VOLwithaContinuousAccessXPS-VOLasshowninFigure 19,thewrite operation to the Continuous Access XP P-VOL takes time. Especially, when the BC pair is in the PSUS(SP) status,thewriteoperationtotheContinuousAccessXPP-VOLmaytakeextratimeduetothetimefor copying to t Access XP pa
he BC pair. In addition, in the case of Continuous Access XP Asynchronous, the Continuous
ir may be suspended and fail due to a shortage of capacity in its side le.
The conguration shown in Figure 20 is an example of a volume functioning as both a Continuous Access XP P-VOL and BC P-VOL, while the S-VOL of the same Continuous Access XP pair is also functioning as the P-VOL of another BC pair. With this conguration, you can perform the following:
UseBCtoprovideon-sitebackupcopiesofContinuousAccessXPP-VOLsandS-VOLs
Use Continuous Access XP to provide remote backup of BC P-VOLs
Figure 20 BC and Continuous Access XP: shared P-VOL/P-VOL and P-VOL/S-VOL
The conguration shown in Figure 21 is an example of a volume functioning as both a BC S-VOL and Continuous Access XP P-VOL. With this conguration, you can use Continuous Access XP to provide asynchronous remote copy.
NOTE:
This configuration does not allow BC and Continuous Access XP to copy at the same time. Create the BC pair rst, and then split the pair before creating the Continuous Access XP pair. You must suspend the Continuous Access XP pair to resync the BC pair. The Continuous Access XP pair status cannot be changed when the BC pair is in PSUS(SP) status.
Business Copy XP user guide
47
Figure 21 BC and Continuous Access XP: shared S-VOL/P-VOL
Usually Continuous Access XP and Continuous Access XP Journal can share volumes with BC. However, in some cases, you cannot create BC pairs using volumes shared with Continuous Access XP and Continuous Access XP Journal. Figure 22 and Figure 23 show examples of when you cannot create BC pairs using volumes shared with Continuous Access XP and Continuous Access XP Journal.
NOTE:
A Continuous Access XP Journal primary volume (P-VOL) means a Continuous Access XP Journal primary data volume. A Continuous Access XP Journal secondary volume (S-VOL) means a Continuous Access XP Journal secondary data volume.
Figure 22 is an example of a volume functioning as both a Continuous Access XP Journal S-VOL and a
Continuous Access XP P-VOL. In this conguration, you cannot use this volume as the P-VOL of a BC pair.
Figure 22 BC, Continuous Access XP Journal, and Continuous Access XP: Shared S-VOL/P-VOL/S-VOL
Figure 23 is an example of a volume functioning as both a Continuous Access XP S-VOL and a Continuous
Access XP Journal P-VOL. In this conguration, you cannot use this volume as the P-VOL of a BC pair.
48
Business Copy XP (BC) for the Array
Figure 23 BC, Continuous Access XP, and Continuous Access XP Journal: Shared S-VOL/P-VOL/S-VOL
Combining B
BC can creat However, yo
Table 15 sho
a BC pair.
Table 15 Access attribute and availability as a BC pair volume
Access attribute
Read/Write Read Only Protect S-VOL Disable
Table 16 shows whether you can perform BC operations on the volume with the S-VOL Disable attribute.
Table 16 Availability of BC operations on volumes with the S-VOL Disable attribute
BC operations
Paircreate Pairsplit Paircreate and Pairsplit Forward Pairresync Backward Pairresync Suspend Delete
C with LUN Security XP Extension
e pairs using volumes for which LUN Security XP Extension sets the access attribute.
u cannot create a BC pair specifying a volume with the S-VOL Disable attribute as an S-VOL.
ws whether you can specify the volume with access attribute as a P-VOL or S-VOL of
Availability as a BC pair volume P-VOL S-VOL
OK OK OK OK OK
Availability of BC operations P-VOL S-VOL
OK OK
1
OK OK NO NO OK OK OK
NO NO NO
NO NO NO NO
NO
1
Paircreate and Pairsplit means you simultaneously create and split BC pairs.
Copying access attributes
If you create a BC pair using volumes that LUN Security XP Extension has set to VMA (Volume Management Area), you can copy information about the access attribute in the P-VOL's VMA to the S-VOL.
Business Copy XP user guide
49
Table 17 VMA setting and availability of Paircreate operation
P-VOL
S-VOL Volume without VMA Volume with VMA
Volume without Volume with VMA
VMA
OK NO
NO OK
NOTE:
You can specify a volume with VMA as a reserve volume.
Figure 24 shows the process of copying of access attribute when you create a pair using volumes with
VMA.
NOTE:
When you use volumes with VMA to create a BC pair, both the P-VOL and S-VOL must have VMA.
Figure 24 Copying access attribute
In Figure 24, if both the P-VOL and S-VOL have VMA, the P-VOL's VMA is copied to the S-VOL. In
Figure 24, the S-VOL's access attribute is Read/Write when the pair status is SMPL. After the P-VOL's
VMAiscopiedtotheS-VOL,theS-VOL'saccessattributeisReadOnly,whichissameastheP-VOL's access attribute. When the pair status is PAIR, copied access attribute information is not effective, so the S-VOL's access attribute is still Read/Write. To make the copied access attribute information effective, split the pair and make the pair status PSUS. When the pair status is PSUS, the S-VOL's access attribute changes to Read Only. For more information about pair status and operations related to the access attribute, see Table 18.
50
Business Copy XP (BC) for the Array
CAUTION:
Because the S-VOL's access attribute is changed after copying the P-VOL's access attribute, be careful aboutaccessattributesofvolumestobespecified as BC pairs. For example, if the P-VOL's access attribute is S-VOL Disable, the S-VOL's access attribute is also S-VOL Disable after copying the access attribute. You cannot perform Pairresync operations on the S-VOL that has the S-VOL Disable access attribute. You must change the access attribute to something other than S-VOL Disable. For more information about changing the access attribute, see the
HP StorageWorks LUN Security XP Extension user guide
.
You can set VMA, which is required to copy the access attribute, only when the volume's emulation type is OPEN-V. Table 18 shows whether you can create pairs according to the VMA setting.
Whether you can use LUN Security XP Extension to change or reference the access attribute for BC pair volumes depends on the pair status. Table 18 shows the availability of LUN Security XP Extension operations according to the pair status.
Table 18 Pair status and availability of LUN Security XP Extension operations
Volume
P-VOL
S-VOL
Reserve volume
Pair status LUN Security XP Extension
OK OK COPY (PD) OK OK PAIR COPY (SP) OK OK PSUS (SP) OK OK PSUS OK OK COPY (RS) OK OK COPY (RS-R) PSUE OK OK SMPL COPY (PD) PAIR No COPY (SP) PSUS (SP) OK OK PSUS OK OK COPY (RS) COPY (RS-R) PSUE
-
OK OK
No
OK OK
No
No
No
No
No
OK OK
OK
OK OK OK
OK OK OK
1
2
1, 2
1, 2
1
1, 2
1, 2
1, 2
1
If the VMA copy is not completed, referred information might not be the same as the P-VOL’s information.
2
When the S-VOL’s mode is “noread”, you can refer to the access attribute only when the pair status is COPY(SP), PSUS, or
PSUS(SP). For more information about the “noread” mode, see the HP StorageWorks RAID Manager XP user guide.
License capacity of LUN Security XP Extension
To create BC pairs using volumes with VMA, you need the license capacity of LUN Security XP Extension for both P-VOLs and S-VOLs. This is because the S-VOLs have the same access as the P-VOLs when the access attribute copy is complete. For more information about copying access attributes, see Figure 24.
Business Copy XP user guide
51
You can also copy access attributes of cascaded pairs. Figure 25 shows the required license capacity of LUN Security XP Extension when you create cascaded pairs using volumes with VMAs and access attributes.
Figure 25 function
In Figure 25, VMAs are set to cascaded pairs' volumes. Before copying, the root volume's access attribute is Read Only, the node and leaf's access attribute is Read/Write. When copy operations, such as update copy or pairresync, are performed on these cascaded pairs, the root volume's access
te is copied to the node and leaf volumes. Therefore, to set the access attribute for volumes used in
attribu cascade pairs, LUN Security XP Extension needs license capacity for the root volume and the node and leaf volumes. If you set the access attribute to the root, node, or leaf volume, LUN Security XP Extension
es license capacity for the root, node, and leaf volumes.
requir
NOTE:
If LUN Security XP Extension's license capacity is insufcient, you might not able to create BC pairs. For more information about LUN Security XP Extension's license capacity, see the
Security XP Extension user guide
Starting BC
After you enable the BC feature on the Command View XP management station or XP Remote Web Console and prepare for BC operations, you are ready to start BC.
1. Launch Command View XP or XP Remote Web Console.
2. Click the Business Copy button
disk array, currently selected port, and all volumes (LUs) installed under the current port.
Required license capacity for LUN Security XP Extension when using cascade
HP StorageWorks LUN
.
. The BC main screen shows the name of the connected
52
Business Copy XP (BC) for the Array
Figure 26 BC main screen
You can now perform BC operations. You rst need to reserve the volumes you plan to use as BC S-VOLs (see Setting reserve attributes for instructions). You can then start adding BC pairs (see
Creating BC pairs (Paircreate) for instructions).
BC main screen
The BC mai array and performs all BC operations. To open the BC main screen, click the BC button. There are four tabs on the BC main screen: Display, History, Options,andSnapshot XP.
NOTE:
The Snaps informat information about Snapshot XP pair items, see the
The Display pane of the BC main screen has the following features:
Use the Tree View box on the left side to select the port, host group, or dened P-VOL (pair).
ion about BC and Snapshot XP pairs, this section only explains BC pair items. For more
The following icons appear in the tree:
Table19BCtreeicons
n screen displays BC volume and pair information for the selected port of the connected disk
hot XP tab appears only when Snapshot XP is installed. Although the BC main screen displays
HP StorageWorks Snapshot XP user guide
.
Icon
Meaning
Port
Host group
LUN
Root
Business Copy XP user guide
53
NOTE:
You can lter volumes or volume pairs displayed in the Volume list on the upper-right side of the Display tab by selecting a port, host group, or volume (P-VOL). To display all volumes and pairs, select Port (Subsystem) at the top of the Tree View box.
The Volume list on the upper-right of the Display pane shows all available volumes on the port,
host group, or P-VOL selected in the Tree View box. You can sort volumes by port, group, path, MU#, status, port (S-VOL), group (S-VOL), S-VOL path, copy pace, copy progress, volume emulation type, and capacity. You can also lter volumes by reserve attribute, pair condition, and pair status in the Display Filter window. To open the Display Filter window, click Display Filter, or select the Display Filter command from the shortcut menu.
NOTE:
The maximum number of volumes that can be displayed in the Volume List at one time is 1,024. If the number of volumes dened in the disk array exceeds this limit, use the Previous and Next buttons on theupperrightoftheVolumelisttoturnthepagesoftheVolumelisttoseetheentirelist.
The following icons indicate the status of a volume or pair:
Table 20 Status icons for BC
Icon LDEV status
L1 pair
L2 pair
S-VOL (node
Reserved volume
An error occurred during operations. This error icon is displayed in the Preset Volume list.
volume: Secondary,Leafvolume:Leaf)
The Preset Volume list, below the Volume list, displays the content of the operations (volume/pair
information) that have been set or specied, but are not yet applied to the disk array.
The Volum
e/Pair Settings box on the lower-right side displays:
NOTE:
The Volum
e/Pair Settings information is displayed above and below the Preset Volume list.
Preset: Number of operations (volume/pair information) that have not been performed in the
disk array. The Preset Volume list, located below the Volume list, displays preset operations. Click Apply to perform the specied operations displayed in the Preset Volume list.
Volume: Total number of volumes dened in the disk array.
Pairs: W(X)/Y/Z, where:
W = total number of BC pairs X = total number of BC and ShadowImage for z/OS pairs Y = total number of Snapshot XP pairs Z = maximum number of pairs that can be created in one array (BC/Snapshot XP/ShadowImage
for z/OS /Auto LUN XP/Flex Copy/Hitachi FlashCopy Mirroring/Hitachi FlashCopy Mirroring Version 2)
54
Business Copy XP (BC) for the Array
NOTE:
The value (X) does not include Auto LUN XP, Flex Copy, Snapshot XP, Hitachi FlashCopy Mirroring, or Hitachi FlashCopy Mirroring Version 2 pairs. If these pairs exist, BC paircreate operations may fail,evenwhen(X)islessthan8,191.
Reserve:X(Y)/Z,where: X = total number of BC reserved volumes Y = total number of BC and ShadowImage for z/OS reserved volumes Z = maximum number of reserved volumes that can be created in one array (BC/ShadowImage
for z/OS /Auto LUN XP/Flex Copy)
NOTE:
The value (Y) does not include Auto LUN XP, Flex Copy, Snapshot XP, Hitachi FlashCopy Mirroring, or Hitachi FlashCopy Mirroring Version 2 pairs. If these pairs exist, the BC paircreate operation may fail even when (Y) is less than 8,191.
Use the Display Filter button to lter volumes displayed in the Volume list.
The Previou
when the num number of volumes that can be displayed on one page. The button is unavailable if the total number of dened volumes is less than 1,024.
The Next button displays the next page of the Volume list. This button is available only when the
number of volumes dened in the disk array exceeds 1,024, which is the maximum number of volumes t dened vo
The Apply button performs BC operations displayed in the Preset Volume list in the disk array. If
the specied operations complete successfully, the Preset Volume list is cleared. If an error occurs during a code an
The Cancel button cancels all operations specied on the Display tab.
To perform BC operations for volumes, select one or more volumes in the Volume list, right-click, and
the command (see Volume list and Table 21).
select For information about the Snapshot XP tab, see the HP StorageWorks Snapshot XP user guide.
s button returns to the previous page of the Volume list. This button is available only
ber of volumes dened in the disk array exceeds 1,024, which is the maximum
hat can be displayed on one page. The button is unavailable if the total number of
lumesislessthan1,024.
n operation, the failed operation remains in the Preset Volume list. To display the error
d message for the failed operation, select the Detail command.
Volume list
TheVolumelist(Figure 27) displays volume/pair information based on lter options selected in the Tree View box (along the left side of the screen).
NOTE:
You can select up to 512 volumes/pairs in the Volume list.
NOTE:
ThemaximumnumberofvolumesdisplayedintheVolumeListis1,024.Ifthenumberofvolumesdefined in the disk array exceeds this limit, use the Previous and Next buttons on the upper right of the Volume listtoturnthepagesoftheVolumelisttoseetheentirelist.
Business Copy XP user guide
55
Figure 27 Volume list
The Volume list contains all installed volumes (LUs) on the selected port and displays the following information for each volume:
Port: Port ID (cluster and channel number) of each volume. If L2 pairs exist, a different icon
displays. To display detailed information on L2 pairs, double-click the corresponding S-VOL in the Volume list.
G-ID:Hostgroupofeachvolume.
LUN: CU:LDEV (control unit image:logical device ID) of each volume.
NOTE:
An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external volume.
MU: MU number of a BC cascade pair formed with the volume. For more information about what
appears if you select Snapshot XP pairs, see the HP StorageWorks Snapshot XP user guide.
Status: BC pair status of the volume pair: SMPL, COPY(PD), PAIR, PSUS, COPY(RS), PSUE,
COPY(SP), COPY(RS-R), PSUS(SP), SMPL (PD), Secondary,andLeaf. For more information about the Snapshot XP pair status, see the HP StorageWorks Snapshot XP user guide.
Port: Port ID (cluster and channel number) of the rst S-VOL of each volume. If there is no S-VOL,
--- is displayed.
G-ID:HostgroupoftheS-VOL.IfthereisnoS-VOL,--- is displayed.
LUN(S): CU:LDEV (control unit image:logical device ID) of the S-VOL. If there is no S-VOL, --- is
displayed.
NOTE:
An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external volume.
CTG: Consistency group number of the S-VOL. If no consistency group is set for the S-VOL, --- is
displayed. For more information about the Snapshot XP pair status, see the HP StorageWorks
Snapsho
tXPuserguide.
SvolMode: Status of the S-VOL. For more information about the Snapshot XP pair status, see the
HP StorageWorks Snapshot XP user guide.
S-VOL Wr
ite: When the S-VOL status is COPY(SP), PSUS(SP),orPSUS and the host writes to
the S-VOL, W is displayed.
Hide Mode: When the S-VOL is set to hide mode, N is displayed.
CopyPa
inform
ce: Copy pace (Slower, Medium,orFaster)forthepairbeingcreated. Formore
ation about the Snapshot XP pair status, see the HP StorageWorks Snapshot XP user guide.
Prog/Sync: If the volume pair is in COPY status, the copy progress (%) is displayed (for example,
0% or 45%). If there is no S-VOL, --- is displayed. For more information about the Snapshot XP pair status, see the HP StorageWorks Snapshot XP user guide.
Type:
Device emulation type (for example, OPEN-3). When you create a BC pair, the number of required differential tables changes according to the emulation type of the volumes. For more information, see Calculating the number of differential tables for one BC pair.
Capacity(MB): Storage capacity of the volume in MB.
CLPR
(P): The cache logical partition of the P-VOL is displayed.
CLPR(S): the cache logical partition of the S-VOL is displayed.
56
Business Copy XP (BC) for the Array
You can perform BC operations for volumes in the Volume list by using the following shortcut menu commands (see also Table 21):
Detail: Displays pair status for selected volumes/pairs.
Paircreate: Creates or adds new BC pairs.
Pairsplit: Splits BC pairs.
Pairresync: Resynchronizes BC pairs.
Pairsplit-E: Suspends BC pairs.
Pairsplit-S: Deletes BC pairs.
Change Reserve: Sets and resets the BC reserve attribute.
S-Vol Path: Displays the S-VOL's port, group, and path (LUN) of the selected pair.
Display Filter: Filters volumes displayed in the Volume list. Clicking Display Filter is another
method of accessing this command.
Table 21 BC operations shortcut menu commands
Operation
Detail Paircreate Yes Pairsplit Pairresyn Pairsplit-E Pairsplit-S Change
Reserve S-Vol Path
Detail window
This win pair or volume in the Volume list, right-click, and select Detail. If the P-VOL of the selected pair has two or more S-VOLs sharing the same P-VOL, the Detail window displays all S-VOLs.
NOTE:
If you se
ent then when you select a BC pair. For more information, see the
differ
user guide
Pair status SMPL COPY
(PD)
Yes Yes Yes Yes Yes Yes Yes Yes Yes
No No No No No No No No
Yes Yes Yes
c
No No No No No No Yes
No
Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No No No No No No No
Yes Yes Yes Yes Yes Yes Yes Yes
PAIR
COPY (SP)
No No No No No No
PSUS
PSUS COPY
(SP)
Yes Yes
No
Yes Yes Yes
COPY
(RS)
No No
(RS-R)
PSUE
Yes No No
dow displays information for the selected volume or pair. To open the Detail window, select a
lect the Detail command when selecting a Snapshot XP pair, the displayed Detail window is
HP StorageWorks Snapshot XP
.
Business Copy XP user guide
57
Figure 28 Detail window
S-Vol Path window
This windo Path window, select one or more pairs in the Volume list, right-click, and select S-Vol Path.
w displays information on the selected pair (all paths dened for the S-VOL). To open the S-Vol
Figure 29 S-Vol Path window
NOTE:
The S-Vol Path command is not available when selecting SMPL volumes.
58
Business Copy XP (BC) for the Array
Display Filter
window
This window lt status. To open the Display Filter window, click Display Filter on the BC main screen, or select any pair or volume in the Volume list, right-click, and select Display Filter.
Figure 30 D
The Display Filter window (BC tab selected) has the following features:
CLPR:Displaysthespecified cache logical partition (CLPR).
Volume Type:
Internal Vol: Displays or hides internal volumes.
External Vol: Displays or hides external volumes.
ers volumes displayed in the Volume list by reserve attribute, pair condition, and pair
isplay Filter window (BC tab selected)
NOTE:
Both check boxes are selected by default.
Attribute:
Reserve(d): Displays reserved or unreserved volumes. If you select the Reserve(d) check
box, only reserved volumes appear in the Volume list. If you clear the Reserve(d) check box, only unreserved volumes appear.
NOTE:
If you select the Reserve(d) check box, you cannot select any other check boxes.
NOTE:
The disk array automatically reserves volumes specied as a BC pair S-VOL.
Pair: Displays paired volumes.
Non-Pa
External Vol:Displaysexternalvolumes.
Cascade: Filters pairs in the Volume list by cascade level. Selecting L1 displays only L1 pairs.
Selec
ir: Displays non-paired volumes.
ting L1-L2 displays L1 and L2 pairs.
Business Copy XP user guide
59
Pair Status:
BC: Displays or hides BC pairs.
Snapshot XP: Displays or hides Snapshot XP pairs.
NOTE:
If a check box is not selected, all check boxes in each tab are grayed out.
BC: Check boxes for the pair statuses are available only when you select the Pair check box in the
Attribute box. If you select the check boxes, you can display pairs in those statuses. You must also
select the BC check box in the Pair Status tab to use these check boxes.
Snapshot XP: This tab is for Snapshot XP pairs, and only appears if Snapshot XP is installed. For
more information, see the HP StorageWorks Snapshot XP user guide.
OK button: Applies the settings, and closes the Display Filter window.
Cancel button: Resets the settings, and closes the Display Filter window.
NOTE:
Filter settings are only effective within the current BC session. If you switch to another program feature (suchasLUNManagerorContinuousAccessXP)orclickabuttononthetoolbar,thesettingsarereset.
Preset Volume list
The Preset Volume list is located below the Volume list, and lists the specied operations (volume/pair information) that have not been performed in the disk array.
Figure 31 Preset Volume list
Use the Preset Volume list to hold multiple settings of the same operation only. You cannot display different types of operations (for example, pairsplit and pairresync) in the Preset Volume list at the same time. You can also cancel the operations in the Preset Volume list.
The Preset Volume list displays the following information of specied operations:
Port: Port ID (cluster and channel number) of each volume. If L2 pairs exist, a different icon
displays.
Group (G-ID): Host group of each volume.
CLPR (P): The cache logical partition (CLPR) of the P-VOL.
CLPR (S): The cache logical partition (CLPR) of the S-VOL.
Path (LUN): CU:LDEV (control unit image:logical device ID) of each volume.
NOTE:
An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external volume.
MU: MU number of a BC cascade pair member volume. For more information about what
appears if you select Snapshot XP pairs, see the HP StorageWorks Snapshot XP user guide.
Port: Port ID (cluster and channel number) of the rst S-VOL of each volume.
Group (G-ID): Host group of the S-VOL.
S-Vol Path (LUNS): CU:LDEV (control unit image:logical device ID) of the S-VOL.
60
Business Copy XP (BC) for the Array
NOTE:
An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external volume.
Pace: Copy pace for all pairs being created: Slower, Medium,andFaster.Formoreinformation
about what appears if you select Snapshot XP pairs, see the HP StorageWorks Snapshot XP user guide.
Code:Ifthespecified option in the Preset Volume list is performed by clicking Apply,butthe
operation fails, the reason code is displayed.
To perform the specied operations, click Apply on the BC main screen. When all operations are performed successfully, the Preset Volume list is cleared. However, failed operations remain in the Preset Volume list. You can also cancel one or all operations by using the following shortcut menu commands:
Delete: Cancels the selected operation only. To display the Delete command, select a volume or
pair, and right-click.
Delete All: Cancels all operations displayed in the Preset Volume list. To display the All Delete
command, deselect any volume or pair, and right-click.
Detail: Displays the Error window, which lists error code and message for the failed operation.
Performing BC operations
Setting reserve attributes
Use the Set Reserve Attribute window to set the reserve attribute for volumes selected on the BC main screen. To open the Set Reserve Attribute window, select one or more unreserved SMPL volumes in the Volume list on the BC main screen, right-click, and click Change Reserve.
Figure 32 Set Reserve Attribute window
The Set Reserve Attribute window displays unreserved volumes selected on the BC main screen. Clicking OK sets the reserve attribute for unreserved volumes.
The setting is displayed in the Preset Volume list on the BC main screen. The Cancel button closes the Set Reserve Attribute window without reecting the settings. To apply the settings to the disk array, click Apply on the BC main screen.
Reserving one or more volumes for use as BC S-VOLs
1. Unmountthevolumesyouwanttoreserve.ThediskarrayrejectsallwriteI/Ostoreservedvolumes
(exceptwheninPSUSstatus).
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2. From the BC main screen, select the port, host group, or LUN in the Tree View box.
3. Display reserved SMPL volumes in the Volume List.
NOTE:
To display unreserved SMPL volumes in the Volume List, open the Display Filter window, clear the Reserved and Pair check boxes, select the Non-Pair check box, and click OK.
4. Select the volumes, right-click, and select Change Reserve. The Set Reserve Attribute window
appears. If the Change Reserve command is not enabled, you selected paired volumes. Select only unreserved and unpaired volumes.
5. From the Set Reserve Attribute window, select the volumes you want to reserve, and click OK.
The setting is reected in the Preset Volume list on the BC main screen.
6. From the BC main screen, click Apply.
7. Verify that the settings are reected in the disk array. To check the attribute, click Display Filter.
NOTE:
You can check whether the attribute setting is updated on the Display Filter window. To open the Display Filter window, click Display Filter.
Resetting reserve attributes
Use the Reset Reserve Attribute window to reset the reserve attribute for the volume selected on the BC main screen. To open the Reset Reserve Attribute window, select one or more reserved SMPL volumes in theVolumelistontheBCmainscreen,right-click,andclickChange Reserve.
Figure 33 Reset Reserve Attribute window
The Reset Reserve Attribute window displays the reserved volumes selected on the BC main screen.
g OK resets the reserve attribute for reserved volumes.
Clickin The settings are displayed in the Preset Volume list on the BC main screen. The Cancel button closes the
Reset Reserve Attribute window without reecting the settings. To apply the settings to the disk array, click Apply on the BC main screen.
Unreserving one or more volumes
1. Ensure that the volumes you want to unreserve are no longer assigned to BC pairs as S-VOLs.
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2. In the BC main screen, select the port, host group, or LUN in the Tree View box.
3. To display reserved SMPL volumes in the Volume list, open the Display Filter window, select the
Reserve(d) check box, and click OK.
4. Select the volumes, right-click, and select Change Reserve. The Reset Reserve Attribute window
appears. If the Change Reserve command is not enabled, you selected paired volumes. Select only reserved and unpaired volumes.
5. In the Reset Reserve Attribute window, select the volume you want to unreserve, and click OK.
The setting is reected in the Preset Volume list on the BC main screen.
6. In the BC main screen, click Apply.
7. Verify that the settings are reected in the disk array. To check the attribute, click Display Filter.
Creating BC pairs (Paircreate)
CAUTION:
The BC paircreate operation overwrites all existing data on the S-VOLs. You are responsible for backing up data on the S-VOLs before creating BC pairs.
The Paircreate window displays P-VOL and S-VOL information for the pairs being created (added). Use the Paircreate window to select the S-VOLs for each P-VOL, set the copy pace for all pairs being created, and start the paircreate operations. To open the Paircreate window, select one or more SMPL volumes or PSUS pairs in the Volume list on the BC main screen, right-click the selected volumes, and select Paircreate.
Figure 34 Paircreate window
The Paircreate window consists of the following components:
• PaircreateVolumeList
•CopyPacelist
•SelectMUlist
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•SelectS-Volbox
•Buttons
• Creating L1 pairs
Paircreate Volume List
The Volume List the P-VOL and S
NOTE:
The S-VOL for each P-VOL is displayed only after being selected (using Set or Change).
Port: Port ID (cluster and channel number) of the P-VOL.
G-ID: Host group ID of the P-VOL.
LUN:CU:LDEVoftheP-VOL.
NOTE:
An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external volume.
MU:MUnumberoftheP-VOL.
Status:StatusoftheP-VOL.
Port: Port ID (cluster and channel number) of the rst S-VOL of each volume pair.
G-ID: Host group ID of the S-VOL.
SvolMode (LUN(S)):CU:LDEVoftheS-VOL.
in the upper half of the Paircreate window displays the following information about
-VOL used for creating a pair:
NOTE:
An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external volume.
Type: Emulation type of the P-VOL and S-VOL.
Capacity (MB): Volume capacity displayed in megabytes (MB).
CLPR(P): Cache logical partition of the P-VOL.
CLPR(S): Cache logical partition of the S-VOL.
Copy Pace list
Use the Copy Pace list to select the copy pace for all pairs being created: Slower, Medium,andFaster.
NOTE:
When the Preset List already contains Paircreate settings, and you specify a different copy pace for newpairsinthePaircreatewindow,thecopypaceforexistingpaircreatesettingsinthePresetListare also changed. The latest copy pace specied in the Paircreate window is in effect before the settings are reected to the disk array.
Select MU list
Use the Select MU list to select the MU number for each pair being created: 0, 1,and2 for L1 pairs, and 1 and 2 for L2 pairs.
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NOTE:
You can select an MU number for a cascade pair. You cannot select the same MU number for different cascade pairs of the same P-VOL (root or node volume).
Select S-Vol box
This box lters S-VOLs displayed in the S-VOL list.
Port list: Displays available S-VOLs by port.
Volume Type:
Internal Vol: Select available S-VOLs that are internal volumes.
External Vol: Select available S-VOLs that are external volumes.
NOTE:
You can select external volumes only when External Storage XP is available.
Attribute: Select available S-VOLs that are reserved when the Reserved check box is selected, or
that are unreserved when the Not Reserved check box is selected. You can also select the pairs that can be set as L2 pairs when the Pair check box is selected.
NOTE:
The number of secondary volumes that can be displayed in the S-VOL List at one time is limited to 1,024. If the number of volumes defined in the disk array exceeds this limit, use the Previous and Next buttons on the upper right of the S-VOL List to turn the pages of the S-VOL List and see the entire list.
Buttons
Previous: Returns to the previous page of the S-VOL List. This button is selectable only when the
number of volumes dened in the disk array exceeds 1,024, which is the maximum number of volumes that can be displayed on one page. The button is unavailable if the total number of volumes dened in the disk array is less than 1,024 volumes.
Next: Turn to the next page of the S-VOL List. This button is selectable only when the number of
volumes dened in the disk array exceeds 1,024, which is the maximum number of volumes that canbedisplayedononepage.Thebuttonisunavailableifthetotalnumberofvolumesdefined in the disk array is less than 1,024 volumes.
S-VOL List: Displays the following information related to S-VOLs:
Port: Port ID (cluster and channel number) of the S-VOL.
Group (G-ID): Host group ID of the S-VOL.
S-Vol Path (LUN):CU:LDEVoftheS-VOL.
Pair Num: Number of pairs.
Type: Emulation type of the S-VOL.
Capacity (MB): Capacity of the S-VOL in megabytes (MB).
CLPR: The cache logical partition (CLPR) of the S-VOL.
Set: Adds the selected S-VOL and P-VOL to the Paircreate Volume List as an L1 pair.
Change: Replaces the existing S-VOL of the selected L1 pair (meaning the S-VOL of the pair after
completing the operation selected in the Paircreate Volume List) with the selected S-VOL.
Cascade: Adds the selected S-VOL and P-VOL (node volume) to the Paircreate Volume List as a L2
pair. To use the Cascade button, select one of the listed L1 pairs.
OK: Adds the operation (setting) to create a new pair using the P-VOL and S-VOL selected in
thePaircreatewindowtothePresetListontheBCmainscreen.
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NOTE:
To apply the new pair operation setting displayed in the Preset List to the disk array, click Apply on the BC main screen.
Cancel: Cancels the operations set in the Paircreate window and closes the Paircreate window.
To remove any volumes from the Paircreate Volume List or S-VOL List, select the volumes, right-click the selected volumes, and select Delete.
Creating L1 pairs
To create new BC pairs and split them immediately so you can access the S-VOLs as soon as possible, use the pairsplit operation instead of the paircreate operation (see Splitting BC pairs (Pairsplit)).
1. Ensure that the S-VOLs are unmounted.
2. In the BC main screen, select the port, host group, or P-VOL in the Tree View box to lter the volumes
displayed in the Volume list.
3. Select the P-VOLs for the new pairs, right-click the selected P-VOLs, and select Paircreate.The
Paircreate window appears.
NOTE:
Do not select reserved volumes.
4. Set the initial copy pace for all pairs being created: Slower, Medium,orFaster.
5. Verify that the Paircreate window displays the P-VOLs. To remove any volumes from the list, select the
volumes, right-click the volumes, and select Delete.
6. Select the S-VOLs for each P-VOL as follows:
a. Select the P-VOL in the Paircreate window. b. In the Select MU list, select the MU number for the L1 pair being created: 0, 1,or2. c. Select the port in the Port list, select the Reserved check box to display reserved volumes,
and select the S-VOL.
NOTE:
You can select an unreserved volume as the S-VOL. When you create the pair, the disk array changes the reserve attribute to “reserved” automatically.
d. Click Set to create (add) the S-VOL to the selected P-VOL. The S-VOL is displayed next to the
selected P-VOL.
e. To add a second and third S-VOL to the same P-VOL, repeat step 6b — step 6d. Each pair to
be created is displayed separately in the list of pairs in the Paircreate window.
7. Repeat step 6 until all pairs are displayed. Click Change to replace an S-VOL, click Set to add an
S-VOL, and use the Delete command to remove pairs.
8. When the Paircreate window displays the new pairs, click OK to reect all pairs (settings) in the list
tothePresetVolumelistontheBCmainscreen.
9. From the BC main screen, click Apply to create the pairs.
When the initial copy operations start, the BC main screen shows new pairs with COPY(PD) status and progress (%) of the initial copy operations.
10. Click Refresh () to monitor the progress of the initial copy operations.
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CAUTION:
The L2 paircreate operation overwrites all existing data on the L2 S-VOLs. You are responsible for backing up the data on the S-VOLs before creating BC pairs.
Creating L2 pairs
1. Ensure that the L2 S-VOLs are unmounted.
2. In the BC main screen, select the L1 pairs to which you want to add the L2 pairs, right-click the
selected L1 pairs, and select Paircreate. The Paircreate window appears.
3. InthePaircreatewindow,selecttheL1nodevolume,selecttheMUnumber(1 or 2)intheSelect MU
list, and select the S-VOL for the new L2 pair (MU=0 was already used as the L1 S-VOL).
4. Click Cascade to add the L2 pair to the list of pairs.
5. Repeat until all L2 pairs are displayed. Click Change to replace an S-VOL, click Cascade to add an
S-VOL, and use the Delete command to remove pairs.
6. When the Paircreate window displays all new pairs, click OK to reect all pairs (settings) in the list to
thePresetVolumelistontheBCmainscreen.
7. In the BC main screen, click Apply to create the pairs.
When the initial copy operations start, the BC main screen shows new pairs with COPY(PD) status and progress (%) of the initial copy operations.
8. Click Refresh () to monitor the progress of the initial copy operations.
Splitting BC pairs (Pairsplit)
The Pairsplit window displays volume and pair information for volumes and/or pairs selected on the BC main screen. Use the Pairsplit window to split existing BC pairs, or simultaneously create and split new BC pairs (see Creating and splitting pairs ). To open the Pairsplit window, select volumes or pairs in the Volume list on the BC main screen, right-click the selected volumes or pairs, and click Pairsplit.
Figure 35 Pairsplit window
The Pairsplit window consists of the following components:
• Pairsplit Volume List
• Window options
•SelectS-Volbox
•Buttons
• Splitting pairs
• Creating and splitting pairs
Pairsplit Volume List
This list in the upper half of the Pairsplit window displays the following information about the P-VOL and S-VOL of the pair you want to split:
Port: Port ID (cluster and channel number) of the P-VOL
Group (G-ID):HostgroupIDoftheP-VOL
(Path) LUN:CU:LDEVoftheP-VOL
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NOTE:
An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external volume.
MU:MUnumberoftheP-VOL
Status:StatusoftheP-VOL
Port: Port ID (cluster and channel number) of the rst S-VOL of each volume pair
Group (G-ID): Host group ID of the S-VOL
SvolMode (LUN(S)):CU:LDEVoftheS-VOL
NOTE:
An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external volume.
Type: Emulation type of the P-VOL and S-VOL
Capacity (MB): Volume capacity displayed in megabytes (MB)
CLPR(P):Cac
CLPR(S): Cache logical partition of the S-VOL
Window options
Copy Pace list
Usethislisttoselectthecopypace(Slower, Medium,orFaster)forallpairsyouaresplitting. TheSet button appl
he logical partition of the P-VOL
ies the same copy pace to all pairs you are splitting.
Select MU list
Use this list to select the MU number for each pair being created: 0, 1,and2 for L1 pairs, and 1 and 2 for L2 pairs.
NOTE:
You can select an MU number for a cascade pair. You cannot select the same MU number for different cascade pairs of the same P-VOL (root or node volume).
Select Split Type list
Use this list to select the pairsplit type: Quick Split or Steady Split.
Select S-Vol box
This box lters S-VOLs displayed in the S-VOL list.
Port: Display available S-VOLs by port.
Volume Type:
Internal Vol: Select available S-VOLs that are internal volumes.
External Vol: Select available S-VOLs that are external volumes.
NOTE:
You can only select external volumes when External Storage XP is available.
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te: Select available S-VOLs that are reserved when the Reserved check box is selected, or that are unreserved when the Not Reserved check box is selected. You can also select pairs that can be set as L2 pairs when the Pair check box is selected.
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Buttons
NOTE:
The number of secondary volumes that can be displayed in the S-VOL List at one time is limited to 1,024. If the number of volumes defined in the disk array exceeds this limit, use the Previous and Next buttons on the upper right of the S-VOL List to turn the pages of the S-VOL List and see the entire list.
Previous button: Returns to the previous page of the S-VOL List. This button is selectable only when
the number of volumes dened in the disk array exceeds 1,024, which is the maximum number of volumes that can be displayed on one page. The button is unavailable if the total number of volumes dened in the disk array is less than 1,024.
Next button: Turns to the next page of the S-VOL List. This button is selectable only when the
number of volumes dened in the disk array exceeds 1,024, which is the maximum number of volumes that can be displayed on one page. The button is unavailable if the total number of volumes dened in the disk array is less than 1,024.
The S-VOL List displays the following information related to S-VOLs:
Port: Port ID (cluster and channel number) of the S-VOL
Group (G-ID):HostgroupIDoftheS-VOL
S-Vol Path (LUN):CU:LDEVoftheS-VOL
Pair Num: Number of pairs
Type: Emulation type of the S-VOL
Capacity (MB): Capacity of the S-VOL in megabytes (MB)
CLPR: The cache logical partition (CLPR) of the S-VOL
Set: Adds the selected S-VOL and P-VOL to the Pairsplit Volume List as an L1 pair.
Change: Replaces the existing S-VOL of the selected L1 pair (that is, the S-VOL of the pair after
completing the operation selected in the Pairsplit Volume List) with the selected S-VOL.
Cascade: Adds the selected S-VOL and P-VOL (node volume) to the Pairsplit Volume List as an L2
pair. To use the Cascade button, select one of the listed L1 pairs.
OK: Adds the operation (setting) to split a pair composed of the P-VOL and S-VOL selected in
thePairsplitwindowtothePresetListontheBCmainscreen.
NOTE:
To apply the new setting displayed in the Preset List to the disk array, click Apply on the BC main screen.
Cancel: Cancels operations set in the Pairsplit window and closes the Pairsplit window.
To remove any volumes from the Pairsplit Volume List or the S-VOL List, select the volumes, right-click the selected volumes, and select Delete.
Splitting pairs
1. If you
want the split S-VOLs to be identical to the P-VOLs, stop all write operations to the P-VOLs before splitting the pairs. This ensures there are no updates to the P-VOLs while the pairsplit operations are synchronizing the S-VOLs to the P-VOLs.
CAUTION:
The P-VOL and S-VOL are synchronized only when the pair status changes from COPY(SP)
US(SP) to PSUS. Due to the BC asynchronous update copy operations, this status
or PS transition can take several minutes.
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2. In the BC main screen, select the port, host group, or P-VOL in the Tree View box to lter the volumes
displayed in the Volume list.
3. Select the pairs you want to split, right-click the selected P-VOLs, and select Pairsplit.ThePairsplit
window appears. You cannot split a suspended (PSUE) pair.
4. In the Pairsplit window, set the copy pace (Slower, Medium,orFaster) for all pairs being split. If
you change the setting, the latest setting is applied to all pairs
5. Setthesplittype(Quick Split or Steady Split) for each pair being split. The split type is set for all
pairs being split. If you change the setting, the latest setting is applied to all pairs.
6. When the Pairsplit window displays the pairs you want, click OK to add all pairs to the Preset Volume
list on the BC main pane. Use the Delete command to remove any pairs from the list.
7. In the BC main screen, click Apply to split the pairs.
When the pairsplit operations start, the BC main screen shows new pairs with COPY(SP) or PSUS(SP) status and progress (%) of the update copy operations. The PSUS status is displayed right away if there were no pending update copy operations
8. Click Refresh () to monitor the progress of the pairsplit operations.
Creating and splitting pairs
Use the pai operation changes the pair status from SMPL to COPY(SP) or PSUS(SP), copies all data on the P-VOL to the S-VOL, and changes the pair status to PSUS.
1. IfyouwantthesplitS-VOLstobeidenticaltotheP-VOLs,stopallwriteoperationstotheP-VOLs
2. In the BC main screen, select the port, host group, or P-VOL in the Tree View box to lter the volumes
3. Select the volumes that will be the P-VOLs of the new pairs to be created and split, right-click the
4. Set the copy pace (Slower, Medium,orFaster)andsplittype(Quick or Steady) for all pairs being
5. Specify the S-VOLs as follows:
rsplit operation to simultaneously create and split new BC pairs. In this case, the pairsplit
before cr pairsplit operations are synchronizing the S-VOLs to the P-VOLs.
CAUTION:
The P-VOL and S-VOL are synchronized only when the pair status changes from COPY(SP) or PSUS(SP) to PSUS. Due to the BC asynchronous update copy operations, this status transit
displayed in the Volume list.
selected P-VOLs, and select Pairsplit. The Pairsplit window appears.
created and split.
a. Select the P-VOL. b. In the Select MU list, select the MU number (0, 1,or2) for the L1 pair to be created. c. Select the port in the Port list, display either reserved or unreserved volumes, and click the S-VOL. d. Click Set to add the S-VOL to the selected P-VOL. The S-VOL is now displayed next to the
eating and splitting the pairs. This ensures there are no updates to the P-VOLs while the
ion can take several minutes.
selected P-VOL.
e. To add another S-VOL to the same P-VOL, repeat step 5c — step 5d. Each pair to be created
and split is displayed separately in the list of pairs.
6. Repeat step 5 until the L1 pairs are displayed. Click Change to replace S-VOLs, click Set to add L1
S-VOLs, and use the Delete command to remove pairs.
7. To create and split L2 cascade pairs, add the L2 S-VOLs to the L1 pairs as follows:
a. Select the L1 pair from the list of pairs to be created and split.
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b. Ensure that the L1 pairs are split (status = PSUS). c. In the Select MU list, select the MU number (1 or 2) for the L2 pair to be created. d. From the Pairsplit Volume List, select the volume to assign as the S-VOL for the L2 pair. e. Click Cascade to add the L2 S-VOL to the selected L1 pair. The new L2 pair is now displayed. f. To add another L2 S-VOL to the same L1 pair, repeat step 7b — step 7e. Each L2 pair to be
created and split is displayed separately in the list of pairs.
8. Repeat step 7 until the pairs are displayed. Click Change to replace S-VOLs, click Cascade to add L2
S-VOLs, and use the Delete command to remove pairs.
9. When the Pairsplit window displays the L1 and L2 pairs, click OK to reect the settings to the Preset
Volume list on the BC main screen.
10. In the BC main screen, click Apply to create and split the pairs.
When the pairsplit operations start, the BC main screen shows new pairs with COPY(SP) or PSUS(SP) status.
11 . Click Refresh () to monitor the progress of the pairsplit operations.
Resynchron
izing BC pairs (Pairresync)
The Pairre Pairresync window to resynchronize pairs. To open the Pairresync window, select one or more PSUS or PSUE pairs in the Volume list on the BC main screen, right-click the selected pair, and select Pairresync.
Figure 36 Pairresync window
The Pairresync window consists of the following components.
sync window displays pair information for pairs selected on the BC main screen. Use the
Pairresync Volume List
TheVolumeListlocatedontheuppersideofthePairresyncwindowdisplaysthefollowinginformation about the P-VOL and S-VOL of the pair you want to resynchronize:
Port: Port ID (cluster and channel number) of the P-VOL
Group (G-ID):HostgroupIDoftheP-VOL
(Path) LUN:CU:LDEVoftheP-VOL
NOTE:
An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external volume.
MU:MUnumberoftheP-VOL
Status: Status of the P-VOL
Port: Port ID (cluster and channel number) of the rst S-VOL of each volume pair
Group (G-ID):HostgroupIDoftheS-VOL
SvolMode (LUN(S)):CU:LDEVoftheS-VOL
NOTE:
An LDEV number ending with # (for example, 00:01#)indicates the LDEV is an external volume.
Type: Emulation type of the P-VOL and S-VOL
Capacity (MB): Volume capacity displayed in megabytes (MB)
CLPR(P): Cache logical partition of the P-VOL
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CLPR(S): Cache logical partition of the S-VOL
Window options
Use the Resync Type list to select the pairresync type for pairs being resynchronized (Normal
Copy, Quick Res
UsetheCopyPacelisttoselectthecopypace(Slower, Medium,orFaster) for all pairs being
resynchronized.
The OK button a
resynchroni
NOTE:
You must clic
The Cancel button cancels operations set in the Pairresync window and closes the Pairsplit window.
To remove any volumes from the Pairresync Volume List, right-click the selected volumes, and
click Delete.
ync, Reverse Copy,orQuick Restore).
dds the operation setting displayed in the Pairresync Volume List for
zing the specied pairs to the Preset List on the BC main screen.
k Apply on the BC main pane to start the pairresync operation for the specied pairs.
Resynchronizing one or more BC pairs
1. Unmount the split (PSUS) S-VOLs before starting the pairresync operations. When the pairresync
operation starts, the disk array stops accepting write I/Os to the S-VOL.
2. In the BC main screen, select the port, host group, or P-VOL in the Tree View box to lter the volumes
displayed in the Volume list.
3. In the BC main screen, select the pairs to resync, right-click the selected pairs, and select Pairresync.
The Pairresync window appears.
4. In the Pairresync window, select the pairs, and set the copy pace (Slower, Medium,orFaster)and
resync type (Normal Copy, Quick Resync, Reverse Copy,orQuick Restore) for each pair. Reverse and quick restore pairresync cannot be performed on suspended pairs (PSUE) or L2 cascade pairs.
NOTE:
When a quick restore operation is in progress, the array management user interface may display old conguration information. To update the information in the user interface, wait for the quick restore operation to nish, and click Refresh.
CAUTION:
Ensure that the correct resync direction (normal/quick, or reverse/quick restore) is selected.
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CAUTION:
During the quick restore operation, the RAID levels, HDD types, and Cache LUN settings are swapped. To avoid performance impact due to quick restore operations:
• Ensure that the P-VOL and S-VOL have the same RAID level and HDD type before performing the quick restore operation. To restore the original RAID levels after quick restore, stop host I/Os to the pair, split the pair, perform the quick restore operation for that pair again, and restart host I/Os to the pair.
• Because the Cache LUN settings are exchanged during a quick restore operation, you must perform one of the following operations. If you do not, the change of location of the cacheresidenceareasmaycauseI/OperformancetotheCacheLUNdatatobedown.
• SetthesameCacheLUNsettings(locations)fortheP-VOLandS-VOLbefore
performing the quick restore operation.
• Release the Cache LUN settings of the P-VOL and S-VOL before the quick restore
operation, and reset the Cache LUN settings of the P-VOL and S-VOL after the pair changestoPAIRstatusasaresultofthequickrestoreoperation.
If you do not want to resynchronize the P-VOL and S-VOL after the quick restore operation, set the Swap&Freeze option before performing the quick restore operation.
5. Click OK. Repeat step 4 — step 5 until the Preset Volume list on the BC main screen displays the
pairs (settings).
NOTE:
Ensure that the S-VOLs are taken ofinebeforestartingpairresyncoperations.
6. In the BC main screen, click Apply to resync the specied pairs.
The BC main screen displays the results of the pairresync operations (that is, the pair status changed to COPY(
7. Click Refresh () to monitor the progress of the pairresync operations.
RS), COPY(RS-R), or PAIR).
Suspending BC pairs (Pairsplit-E)
The Pairsplit-E window displays pair information for pairs selected on the BC main screen. Use the Pairsplit-E window to suspend pairs. To open the Pairsplit-E window, select one or more pairs (except SMPL and PSUE pairs) in the Volume list on the BC main screen, right-click the selected pairs, and click Pairsplit-E.
Figure 37 Pairsplit-E window
The Pairsplit-E window lists pairs selected on the BC main screen and shows pair status and copy pace for each pair. The OK button suspends the selected pairs. The Cancel button closes the Pairsplit-E window and returns to the BC main screen.
SuspendingoneormoreBCpairs
1. In
2. Select the pairs to suspend (or the volumes whose pairs you want to suspend), right-click the selected
3. In the Pairsplit-E window, select the pairs to suspend, and click OK to reect the settings to the Preset
the BC main screen, click the port, host group, or P-VOL in the Tree View box to lter the volumes
displayed in the Volume list.
airs, and click Pairsplit-E. The Pairsplit-E window appears.
p
Volume list on the BC main screen.
o remove the pairs from the list, right-click while selecting the pairs, and select Delete.
T
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4. Repeat step 2 — step 3 to suspend additional pairs in the list.
5. In the BC main screen, click Apply to suspend the specied pairs.
The BC main screen now displays the results of the pairsplit-E operations (that is, pair status changed to PSUE).
6. Click Refresh () to display the latest information.
Deleting BC pa
The Pairsplit Pairsplit-S window to delete pairs. To open the Pairsplit-S window, select one or more pairs (except SMPL and PSUS(SP) pairs) in the Volume list on the BC main screen, right-click the selected pairs, and select Pairs
Figure 38 Pai
The Pairsplit-S window lists pairs selected on the BC main screen and shows pair status and copy pace for each pair. The OK button deletes selected pairs. The Cancel button closes the Pairsplit-S window and returns to th
irs (Pairsplit-S)
-S window displays pair information for pairs selected on the BC main screen. Use the
plit-S.
rsplit-S window
eBCmainscreen.
Deleting one or more BC pairs
1. To synchronize the P-VOL and S-VOL before deleting the pair:
a. Wait until all write I/Os to the P-VOL are complete, and take the P-VOL ofine to prevent the
P-VOL from being updated during or after the pairsplit-S operation.
b. After the P-VOL is ofine, suspend the pair to copy all pending updates to the S-VOL. c. When the pair status changes to PSUE, the P-VOL and S-VOL are synchronized.
2. In the BC main screen, select the port, host group, or P-VOL in the Tree View box to lter the volumes
displayed in the Volume list.
3. Select the pairs to delete (or the volumes whose pairs you want to delete), right-click the selected
pairs or volumes, and select Pairsplit-S. The Pairsplit-S window appears.
NOTE:
Pairs with PSUS(SP) status cannot be deleted. To remove pairs from the list, right-click whileselectingthepairs,andselectDelete.
4. In the Pairsplit-S window, select the pairs to delete, and click OK to reect the settings to the Preset
Volume list on the BC main screen.
5. In the BC main screen, click Apply to delete the specied pairs or volumes.
The BC main screen now displays the results of the pairsplit-S operations.
6. Click Refresh () to display the latest information.
Viewing BC pair status and history
TheHistorypanedisplayscurrentBCpairstatusinformationandBCpairhistoryinformationforthe selected port. To open the History pane, click the History tab on the BC main screen.
74
Business Copy XP (BC) for the Array
Figure 39 History pane
NOTE:
If Snapshot XP is installed, the lower area of the pane lists the operation history of Snapshot XP pairs. For more information, see the
HP StorageWorks Snapshot XP user guide
.
The upper area of the History pane lists the operation history of BC pairs. The upper area of the History pane displays the following information:
BC pair activity listed by date and time, LU information (port, host group ID, LUN) and volume ID
(CU:LDEV) of the P-VOL and S-VOL, and BC code and message (see Table 22). The Time button sorts the list by date and time. The P-Vol and S-Vol buttons sort the list by P-VOL or S-VOL.The Code button sorts the list by code number. The Message button sorts by message type.
NOTE:
The maximum number of records that can be listed in the History pane is 16,384.
The Refresh button () updates all information in the History pane.
If you perfor
m an operation on a pair before the copy operation starts, the History pane will not display
information about the operation. You may need to wait for a while until the History pane displays operation history if the total number
of the follow
ing pairs is 500 or more:
BC pairs
Snapshot XP pairs
ShadowImag
eforz/OSpairs
Hitachi® FlashCopy® Mirroring pairs
Auto LUN XP pairs
Flex Copy X
P pairs
Even if the total number of pairs is less than 500, displaying operation history may take time when some of the pairs include LUSE volumes.
Business Copy XP user guide
75
Table 22 BC pair activity codes, messages, and descriptions
Code
4710 - 471F PAIR START 4720 - 472F PAIR END
4730 - 473F PSUS START
4740 - 474F PSUS END
4750 - 475F COPY(RS) STARTCOPY(RS-R)
4760 - 476F COPY(RS) ENDCOPY(RS-R)
4780 - 478F S MPL
4790 - 479F
47A0 - 47AF COPY WARNING END 47B0 - 47B
47C0 - 47CF COPY ABNORMAL
Message
START
END
PSUE
F
COPY ABNO END(PVOL
END(SVOL BLOCKADE)
RMAL
BLOCKADE)
Description
BC initial copy BC initial copy operation ended, and pair status changed
to PAIR. BC pairsplit operation started, and pair status changed
to COPY(SP) or PSUS(SP). BC pairsplit operation ended, and pair status changed
to PSUS. BC pairresync operation started, and pair status changed
to COPY(RS) or COPY(RS-R). BC pairresync operation ended, and pair status changed
to PAIR. BC pairsplit-S operation was performed, and pair status
changed to SMPL. BC pairsplit-E operation was performed, and pair status
changed to PSUE. Copy ended with a warning. Copy ended abnormally due to P-VOL blockade.
Copy ended abnormally due to S-VOL blockade.
operation started.
47D0 - 47DF COPY ABNORMAL END 47E7 COMPULSION PAIR
47E9 SI SM INITIALIZATION START
47EA SI SM INITIALIZATION END
47EB SI SM INITIALIZATION FAILED
7FF1 - 02
FFFF
ing BC options
Sett
You c display the Option screen, click the Option tab on the BC main screen.
Copy ended abnormally (reason other than above).
SUSPEND
COPY ABNORMAL END (MULTIPLE PAIRS)
ReferenceCodeunknown Thereferencecodeisunknown.
Apairwa
Initialization of BC extension table was started (SM = shared memory).
Initialization of BC extension table was completed (SM = shared memory).
Initialization of BC extension table failed (SM = shared memory).
Multiple copies ended abnormally. This reference code is reported at a ve-minute interval (one report per ve minutes). If a pair ended abnormally, the pair status changed to PSUE.
ssuspendedcompulsorily.
an set the BC options by selecting and/or clearing the option check boxes on the Option screen. To
Figure 40 Option screen
The Select Option box displays check boxes for the BC options.
76
Business Copy XP (BC) for the Array
NOTE:
More options will be supported in the future. See BC options for further information.
The Apply button applies the option settings in the Select Option box.
Setting a BC option (Swap&Freeze option)
1. In the BC main screen, click Option to display the Select Option box.
Select the option check box. If you do not want to set any option, clear all check boxes in the Select Option box.
2. Click Apply. You can now perform a BC operation with the specied option.
BC error codes
BC displays error messages when error conditions occur during BC operations. The BC Error window displays the BC error code and message. To display the Error window, select the failed volume in the Preset Volume list on the BC main screen (Display tab), right-click, and select Detail. The following table describes the BC error codes and provides instructions for resolving each error condition.
Table 23 BC error codes
Error Code
0401
0402
0801
080B 0810
0811
0812
0813
0814
0817
Description Corrective Action
Alockingtime-outwasdetectedduringan internal processing.
A command (Paircreate, Pairsplit, or Reserve Volume) could not be completed because it was not in the SMPL status internally.
The BC feature could not be used.
The request could not be accepted. Retry about one minute later. The specied command cannot be accepted in
this status. (The command was rejected.) The specied command is treated as an NOP. The specied command is treated as an NOP.
Thenewpaircouldnotbecreatedbecausea path group is set.
The Pairsplit command was issued to a pair in the PSUS status.
ThePaircreatecommandwasissuedtothepair in the PAIR status.
A Reserve volume cannot be set because a path group is set.
A retry may result in a normal termination. Retry about ve seconds later.
A retry may result in a normal termination. Retry about ve seconds later.
Ensure that the disk array has the correct microcode level for BC, the disk array has BC installed and enabled, and the Command View XP management station or XP Remote Web Console has BC installed and enabled.
Check the pair status, and ensure that the pair status is correct for the command.
(NOP means the command can end without errors, but executes nothing.)
Disconnect from host, or cancel Continuous Access XP path.
On the Continuous Access XP main screen, conrm the specied S-VOL is simplex, specify the Delete Pair by Force option, and retry the operation.
The Pairsplit command cannot be issued because the pair is already in PSUS status.
The Paircreate command cannot be issued because the pair is already in PAIR status.
Disconnect volume to be reserved from host, or delete Continuous Access XP path.
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77
Error Code
0 818
081F
0830
0831
Description Corrective Action
The Pairresync or Pairsplit-E command cannot be issued because a path group is set.
Command Reject. P-VOL is used from HOST or by CA.
A pair cannot be created because the track format is different.
A pair cannot be created because a number ofslotsisdifferent.
Unmount the S-VOL (ofine from the host), or delete Continuous Access XP path.
Disconnect from host, or cancel Continuous Access XP path.
Ensure that the emulation type of the P-VOL and S-VOL is the same.
Ensure that the capacity of the P-VOL and S-VOL is the same.
0834
0835
0836
0840 0841 0842 0848 0849 084A 084B 0852
0880­08FF
0C70
0C71
0C72 0C80
0C81
0C82 0C90
0C91
0C92 1001 1002 1003
The emulation type of the specied P-VOL is not supported by BC.
The emulation type of the specied S-VOL is not supported by BC.
The pair cannot be created.
Logical cont Logical contradiction. Logical contradiction. Logical con Logical contradiction. Logical contradiction. Logical cont Command Reject. P-VOL and S-VOL are used
from HOST or by CA. Logical contradiction.
A P-VOL is not installed. Volumes that are not installed cannot be
The P-VOL cannot be used. Call HP technical support to make the P-VOL
The P-VOL is being formatted. Wait until formatting the P-VOL completes. The S-VOL is not installed. Volumes that are not installed cannot be
The S-VOL cannot be used. Call HP technical support to make the P-VOL
The S-VOL is being formatted. Wait until formatting the S-VOL completes. The volume to be Reserved is not installed. Volumes that are not installed cannot be
ThevolumetobeReservedcannotbeused. CallHPtechnicalsupporttomakethevolume
ThevolumetobeReservedisbeingformatted. Waituntilformattingthevolumecompletes. Logical contradiction. Logical contradiction. Logical contradiction.
radiction.
tradiction.
radiction.
Ensure that BC supports the emulation type of the P-VOL.
Ensure that BC supports the emulation type of the S-VOL.
The emulation type of the P-VOL and S-VOL is not the same.
Call HP technical support for assistance. Call HP technical support for assistance. Call HP technical support for assistance. Call HP technical support for assistance. Call HP technical support for assistance. Call HP technical support for assistance. Call HP technical support for assistance. Disconnect from the host, or cancel Continuous
Access XP path. Call HP technical support for assistance.
processed.
status normal.
processed.
status normal.
processed.
status normal.
Call HP Call HP technical support for assistance. Call HP technical support for assistance.
technical support for assistance.
78
Business Copy XP (BC) for the Array
Error Code
1004 1005 1007 1009 1010 1011
1012
1013
Description Corrective Action
Logical contradiction. Logical contra Logical contradiction. The number of BC pairs exceeded the maximum. Delete some of the pairs. Logical contra The number of the volume specied to be a
Reserve volume has already been used for a Reserve volume.
The number of the volume specied to be a Reserve volume has already been used for a primary BC volume.
The number of the volume specied to be a Reserve volume has already been used for a hierarchical control primary volume.
diction.
diction.
Call HP technical support for assistance. Call HP technical support for assistance. Call HP technical support for assistance.
Call HP technical support for assistance. Change the volume number for specifying a
Reserve volume.
Change the volume number for specifying a Reserve volume.
Change the volume number for specifying a Reserve volume.
1014
1015
1016
1017
101E
102 6
102 7
102 8
1029
102 E 102 F 1030 1031
1032
The number of the volume specied to be a Reserve volume has already been used for a hierarchical control destination volume.
The volume specied to be a Reserve volume is not set as a Reserve volume.
Thevolumec as an S-VOL d volumes.
A Reserve volume cannot be set because the max. number of Reserve volumes was exceeded.
The Reserve volume itself does not exist in the system.
It is impo because is root v
It is impossible to make a pair any more because the volume that was specied as P-VOL is node volume already.
It is impossible to make a pair because the volume that was specied as P-VOL is leaf volume already.
It is impossible to make a pair because the volume that was specied as S-VOL is leaf volume already.
P-VOLisusedassourcevolumeforHIHSM. Confirm a matching condition. P-VOL is used as destination volume for HIHSM. Conrm a matching condition. The specied P-VOL number does not exist. Retry after refreshing the screen. The specied P-VOL has been set as a Reserve
volume. No more pairs can be created for the specied
P-VOL.
an appropriately be allocated
oes not exist among Reserve
ssible to make a pair any more
the volume that was specied as P-VOL
olume already.
Change the volume number for specifying a Reserve volume.
Check volume status.
Delete any R as an S-VOL.
Delete any Reserve volumes.
Set one or more Reserve volumes.
Delete some of the pairs of root volume.
Delete some of the pairs of node volume.
Conrm a pair condition.
Confir
Check pair status.
Delete any pairs formed by the P-VOL.
eserve volume that can be allocated
mapaircondition.
Business Copy XP user guide
79
Error Code
1033 1037
Description Corrective Action
The specied P-VOL is not really a P-VOL. The specied P-VOL has been set as a BC
S-VOL.
Check pair status. Check pair stat
us.
103A
103B
103C
103D
103E
103F
1040 1042 1043
1044 1046
The Pairresync command was issued to a device in the SMPL status.
It is impossible to make a pair because volume that was specied as S-VOL is root volume already.
It is impossi that was spec already.
It is impossible for L2 pair to require a split becauseL1pairisnotinthesplitcondition.
A new pair was created with a P-VOL forming the CA cooperation pattern.
A pair status cannot be changed to form the CA cooperation pattern.
The specied S-VOL does not exist. S-VOLisusedasdestinationvolumeforHIHSM. Confirm a matching condition. The speci
used as th The specied S-VOL is not a BC S-VOL. The specied secondary volume is being used
as a CA P-VOL.
ble to make a pair because volume
ied as S-VOL is node volume
ed S-VOL number has already been
at of an S-VOL.
Check pair status.
Conrm a pair condition.
Conrm a pair condition.
After making L1 pair a split condition, re-execute.
Place the BC pair in SMPL status, or place the Continuous Access XP pair that uses the BC S-VOLasaP-VOLinSMPLstatus.
Place the C the BC S-V status.
Set one or more Reserve volumes.
Check pair status.
Check pair status. Delete the Continuous Access XP pair.
ontinuous Access XP pair that uses
OL as a P-VOL in PSUE or SMPL
1047
104A
104B 104E
104F
1050
1051
1053 1054 1058
1070
The spec as a CA S-
The specied secondary volume is being used as a BC P-VOL.
S-VOLisusedassourcevolumeforHIHSM. Confirm a matching condition. The volu
being u Thevolumespecified as a Reserve volume is
being used as a CA S-VOL. The specied P-VOL and S-VOL are not a BC
pair. The vol
S-VOL a Requestcouldnotbeaccepted Requestcouldnotbeaccepted S-VOLisnodevolumewhoseL2statusis
SP-Pend. The status mode specication (status modec) in
the Status Check command is incorrect.
ied secondary volume is being used
VOL.
me specied as a Reserve volume is
sed as a CA P-VOL.
ume numbers of the specied P-VOL and
re the same.
Delete the Continuous Access XP pair.
Check the pair status.
Delete the Continuous Access XP pair.
Delete the Continuous Access XP pair.
Check the pair status.
fter refreshing the screen.
Retry a
Conrm a matching condition. Conrm a matching condition. Conrm
Call HP technical support for assistance.
a matching condition.
80
Business Copy XP (BC) for the Array
Error Code
1071
1072
Description Corrective Action
The status classication (statusindc) in the Status Check command is incorrect.
The CU number specied by the Status Check command (volume status) does not exist.
Call HP technical support for assistance.
Call HP technical support for assistance.
1084
1085
1086
1087 1095
1096
1097
1098
1099
109A
109B
109C
Volume was used for reserve volume of HIHSM.
P-VOL was used for reserve volume of HIHSM.
S-VOL was used for reserve volume of HIHSM.
P-VOLisusedassourcevolumeforHIHSM. Confirm a matching condition. Request could not be accepted because status of
pair who shared with P-VOL was Reverse-copy. RequestcouldnotbeacceptedbecauseL1pair
status was Reverse-copy. RequestcouldnotbeacceptedbecauseL2pair
status was Reverse-copy. Reverse-Copy could not be accepted because
pair status was not Split. Reverse-
because s was neith
Reverse-copy could not be accepted because P-VOL was shared with CA P-VOL whose status was not Suspend.
Reverse-copy could not be accepted because P-VOL was shared with CA S-VOL whose status was not Suspend.
Reverse-copy could not be accepted because S-VOL was shared with CA P-VOL.
copy to L2 pair could not be accepted
tatus of pair who shared with P-VOL
er Split nor Suspend.
Check the volume, or cancel the reserve volume of HIHSM.
Check the P-VOL, or cancel the reserve volume of HIHSM.
Check the S-V of HIHSM.
Conrm a matching condition.
Conrm a mat
Conrm a matching condition.
Conrm a matching condition.
Conrm a matching condition.
Conrm a matching condition.
Conrm a matching condition.
Conrm
OL, or cancel the reserve volume
ching condition.
a matching condition.
Business Copy XP user guide
81
82
Business Copy XP (BC) for the Array
Index
A
access attributes
copying,49 license capacity,51
setting with LUN Security XP Extension,49 At-Time Split function,36 attributes
copying,49
license capacity,51
resetting reserve,62
setting with LUN Security XP Extension,49 audience,7 Auto LUN, combining with BC,43
B
backward pairresync operation,25 BC main screen,53
C
Cache LUN, combining with BC,43 cache maintenance,15 cascade function,23,32 cascade pairs
access attributes, copying,51
creating,23,32
dened,13
MU numbers,68
resynchronizing,72 combining with other data management operations,43 Command View XP management station,13 components,11 Continuous Access XP Journal, combining with BC,43,43 Continuous Access XP, combining with BC,43,
46
conventions
document,8 Copy Pace list,64,68 Copy Threshold,13 Copy threshold option,13 COPY(PD) status
about,40
operations available,34
read/write operations,35 COPY(RS) status
about,40
LUN Security XP Extension operations,51
operations available,34
pairresync operation,24
read/write operations,35
COPY(RS-R) status
about,40 LUN Security XP Extension operations,51 operations available,34 pairresync operation,24 read/write operations,35
COPY(SP) status
about,40 creating and splitting pairs,70 operations available,34
read/write operations,35 creating and splitting pairs,70 CVS operations, combining with BC,43
D
deleting pairs (pairsplit-S),74 Detail window,57 differential tables,15,21 Display Filter,54 Display Filter window,59 Display pane,53 document
conventions,8
prerequisites,7
related documentation,7 documentation
HP website,7
providing feedback,9
E
error codes,77 External Storage XP, combining with BC,43
F
failures,15 features,11 forward pairresync operation,25
H
help
obtaining,8 History pane,74 host I/O performance,32,41,42 HP
technical support,8
I
I/O performance,32,41,42
Business Copy XP user guide
83
initial copy operation,21 inqraid command,16
L
L1 pairs,33,66 L2 pairs,33,67 LDEV maintenance,15 leaf volume,33 license capacity, LUN Security XP Extension,51 LUN Security XP Extension
combining with BC,49
license capacity,51 LUN Security, combining with BC,43 LUs, maximum number of pairs, 20, 20 LUSE operations
BC, combining with,43
pairs, maximum number of,20,20
M
main screen,53 MU numbers,32,64,68
N
node volume,33 normal pairresync operation,25
O
OPEN volumes, differential tables,17 operational requirements,13 operations
overview of,11
pair status and,34 Option screen,76
P
P-VOLs
At-Time Split function,36 backward pairresync operation,25 cascade function,23,32 Continuous Access XP,46 Continuous Access XP Journal,43 creating and splitting pairs,70 data copying operations,12 dened,11 Detail window,57 error codes,77 forward pairresync operation,25 initial copy operation,21 license capacity,51 LUN Security XP Extension,49 paircreate operation,21,63 pairresync operation,25,71 pairs, maximum number of,12 pairsplit operation,23 pairsplit-E (suspend) operation,30,73 pairsplit-S (delete) operation,31,74 preparing for BC operations,42 RAID groups,13 requirements,14 Swap&Freeze,31 update copy operation,22
Volume list,54,55 P. I. T. b acku p s,15 PAIR status
about,40
operations available,34
pairresync operation,24
read/write operations,35 pair status
displaying,38
error codes,77
history,74
icons,54
L1 and L2,34
power supply, switching off,40
types of,40 paircreate operation
about,21
pair status,34
using,63 Paircreate Volume List,64 Paircreate window,63 pairresync operation
about,24
pair status,34
split pairs,30
suspended pairs,30
using,71 Pairresync Volume List,71 Pairresync window,71
84
pairs
At-Time Split function,36 backward resynchronization,25 cascade,13,23,32 Continuous Access XP Journal,43 creating and splitting,70 deleting,31,74 Detail window,57 forward resynchronization,25 initial copy operation,21 license capacity,51 LUN Security XP Extension,49 maximum number of,12 MU numbers,32,64,68 requirements,14 resynchronizing,24,71 settings,54 status,38 suspending,30,73 Swap&Freeze option,31 update copy operation,22
pairsplit operation
about,23 pair status,34
using,67,70 Pairsplit Volume List,67 Pairsplit window,67 pairsplit-E operation
about,30
pair status,34
using,73 Pairsplit-E window,73 pairsplit-S operation
about,31
pair status,34
using,74 Pairsplit-S window,74 PDEV maintenance,15 point-in-time backups,15 power supply, switching off,40 preparing for operations,42 prerequisites,7 Preset Volume list,54,60 PSUE status
about,40
LUN Security XP Extension operations,51
operations available,34
pairresync operation,30
read/write operations,35
resynchronizing pairs,72
PSUS status
about,40 creating and splitting pairs,70 LUN Security XP Extension operations operations available,34 pairresync operation,24,30 read/write operations,35 resynchronizing pairs,72
PSUS(SP) status
about,40 creating and splitting pairs,70 operations available,34 read/write operations,35
Q
quick pairresync operation,25 quick restore operation,31,34 quick restore pairresync operation,26 quick split operation,68
R
RAID groups,13,14 RAID Manager
At-Time Split function,37
differential tables,16 related documentation,7 requirements,13 reserve volumes,21,61,62 reset reserve attribute operation,21 Reset Reserve Attribute window,62 resynchronizing pairs
pairresync operation,71
Swap&Freeze,31 resynchronizing S-VOLs,25 reverse pairresync operation,26,34 root volume,33
S
S-Vol Path window,58
,51
Business Copy XP user guide
85
S-VOLs
At-Time Split function,36 backward pairresync operation,25 cascade function,32 Continuous Access XP,46 Continuous Access XP Journal,43 creating and splitting pairs,70 data copying operations,12 dened,11 Detail window,57 error codes,77 forward pairresync operation,25 initial copy operation,21 license capacity,51 LUN Security XP Extension,49 paircreate operation,21,63 pairresync operation,25,71 pairs, maximum number of,12 pairsplit operation,23 pairsplit-E (suspend) operation,30,73 pairsplit-S (delete) operation,31,74 Path window,58 preparing for BC operations,42 RAID groups,13 requirements,14 reserving,61 Select box,68 Select list,65 set reserve attribute operation,21 Swap&Freeze,31 update copy operation,22
Volume list,54,55 Select MU list,64,68 Select S-VOL box,65,68 set reserve attribute operation,21 Set Reserve Attribute window,61 SMPL status
about,40
creating and splitting pairs,70 speed
copy pace,64,68
copy processing time,41
host I/O performance,32,41,42
initial copy operation,22
pair resynchronization,30 split pairs, pairresync for,30
splitting
cascade pairs,33 pairsplit operation,70
using Pairsplit window,67 starting operations,52 status
error codes,77
history,74
icons,54
L1 and L2 pairs,34
pairs,38
power supply, switching off,40 steady split operation,68 Subscriber's Choice, HP,9 suspending pairs (pairsplit-E),30,73 Swap&Freeze option,31,77 synchronizing volume pairs,12 system requirements,41
T
technical support
HP,8
service locator website,9 Tree View,53 troubleshooting
error codes,77
failures,15
U
unreserving volumes,62 update copy operation,22
V
VMAs (Volume Management Areas),49,51 Volume list,54,55 volumes for BC operations,42
W
websites
HP ,9
HP Subscriber's Choice for Business,9
product manuals,7
86
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