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..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
ing, you will receive e-mail notification of product enhancements, new driver versions,
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For additional information, see the following HP websites:
•h
ttp://www.hp.com
•http://www.hp.com/go/storage
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Business Copy XP user guide
9
10
About this guide
1Business CopyXP(BC)forthe
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 configuration. 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 first 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 first 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 objectsLogical device
Number of copiesMaximum 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
configured. 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
specified as P-VOLs or S-VOLs.
Volumes that form a Flex Copy XP pair cannot be specified as P-VOLs. A Flex
Copy XP P-VOL can be specified 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 HPStorageWorks 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 specified as
VOLs.
lumes for HP StorageWorks Continuous Access XP Journal cannot be
ion.
ions can be performed with External Storage XP operations to create
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 figuring
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)
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
offline and split the pair before using the S-VOL. If the P-VOL cannot be taken
offline, 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 firmware 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 configuring 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.
• 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)
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:
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:
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-L7 (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 5.5GB2
Up to 6.8GB3
Up to 2.7GB
Up to 5.5GB2
Up to 8.4GB
Up to 11.2GB
Up to 13.5GB
33.9GB13
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 29.9GB2Up to 508.9GB
Up to 44.9GB
Up to 59.8GB
Up to 74.8GB
Up to 89.8GB6Up to 568.8GB38
Up to 104.7GB
Up to 119.7GB8Up to 598.7GB
Up to 134.7GB
Up to 149.6GB
Up to 164.6GB
Up to 179.6GB12Up 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 299.3GB20Up to 778.3GB52Up to 1,257.3GB
Up to 314.3GB
Up to 329.3GB22Up to 803.3GB
1
3Upto523.9GB35Upto1,002.8GB67
4
5
7
9Upto613.7GB
10Up t o 628 .7 GB
11
13U p t o 67 3 . 5 G B
14
15
16
17
18
19
21Up to 793.3GB53Up to 1,272.3GB85
Up to 493.9GB
Up to 538.8GB36Up to 1,017.8GB68
Up to 553.8GB37Up to 1,032.8GB69
Up to 583.7GB39Up to 1,062.7GB
Up to 643.6GB43
Up to 688.6GB
Up to 703.5GB
Up to 718.4GB48Up to 1,197.4GB
Up to 733.4GB49Up to 1,212.4GB
Up to 748.4GB
Up to 763.4GB
1
Differen-
Capacity
1
tial tables
33Up to 972.9GB65
34
40
41
42
44
45
46
47
50
51
54
Up to 987.9GB66
Up to 1,047.8GB
Up to 1,077.7GB72
Up to 1,092.7GB73
Up to 1,107.6GB
U p t o 1,12 2. 6 G B
U p t o 1,13 7. 6 G B76
Up to 1,152.5GB
Up to 1,167.6GB78
Up to 1,182.5GB79
Up to 1,227.4GB
Up to 1,242.5GB
Up to 1,287.3GB86
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 389.1GB26Up to 868.1GB58
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 1,511.8GB101Up to 2,005.8GB
Up to 1,526.8GB102Up to 2,020.7GB135
Up to 1,541.7GB
Up to 1,556.7GB
Up to 1,571.7GB105Up to 2,065.6GB138Up to 2,559.6GB
Up to 1,586.6GB106Up to 2,080.7GB139
Up to 1,601.6GB107Up to 2,095.6GB
Up to 1,616.6GB108Up to 2,110.5GB
Up to 1,631.5GB109Up 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 1,706.4GB114Up to 2,200.4GB147Up to 2,694.3GB
Up to 1,7
Up to 1,736.3GB116Up to 2,230.3GB
Up to 1,751.3GB
Up to 1,766.3GB118Up to 2,260.2GB
Up to 1,781.2GB119Up to 2,275.2GB152Up to 2,769.2GB185
Up to 1,796.2GB120Up to 2,290.2GB153
Up to 1,
Up to 1,826.1GB122Up to 2,320.1GB
Up to 1,841.1GB
6.4GB
21.4GB
811. 2 GB
23Up to 823.2GB
24
25Up to 853.2GB
27Up to 883.1GB59Up to 1,362.1G
28Up to 898.1GB60Up to 1,377.1GB92
29Up to 913.0GB61Up to 1,392.0GB93
30Up to 928.0GB62
31
32Up to 957.9GB
97
9 8U p t o 1,9 6 0 . 9 G B131
99Up to 1,975.8GB132
100Up to 1,990 .
103Up to 2,035
104
110
111
11 2
11 3
11 5
11 7
121U p t o 2 ,
123Up to 2,335.1GB156Up to 2,829.0GB189
Up to 838.2GB56Up to 1,317.2GB88
Up to 943.0GB
Up to 1,945.9GB
Up to 2,050.7GB137
Up to 2,140.5GB143Up to 2,634.4GB
Up to 2,155.4GB144Up to 2,649.4GB
Up to 2,17
Up to 2,185.4GB146
Up to 2,215.3GB
Up to 2,245.3GB
1
8GB
.7GB
0.4GB
305.1GB
Differen-
Capacity
tial tables
55
57
63
64Up to 1,436.9GB
13 0
13 3
13 4U p t o 2 , 4 9 9. 7 G B
13 6U p t o 2 , 5 2 9
14 0
141Up to 2,604.5GB174
14 2
14 5U p t o 2 , 6 6
14 8
149Up to 2,724.3GB
15 0U p t o 2 ,7 39 . 2 G B18 3
151
15 4
15 5
Up to 1,302.2GB87
Up to 1,332.2GB89
Up to 1,347.1GB
Up to 1,407.0GB94
Up to 1,422.0GB
Up to 2,439.9GB
Up to 2,454.8GB164
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 2,589.5GB173
Up to 2,619.5GB
Up to 2,679.3GB179
Up to 2,709.3GB181
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 1,871.0GB125Up to 2,365.0GB158Up to 2,859.0GB191
Up to 1,886.0GB126Up to 2,380.0GB159Up to 2,873.9GB192
Up to 1,901.0GB127
Up to 1,915.9GB128
Up to 1,930.9GB129
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 0U p t o 2 ,8 8 0 . 0 GB19 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=3870≤ 13 , 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=30≤ 13 , 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, offline 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 first 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 finish the copy operation quickly in order to access the S-VOL, take the P-VOL
offline 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
configuration information. To update the information in the user interface, wait for the quick restore
operation to finish, 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 fulfill 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 specified pair must be in the PSUS state. All other pairs sharing the same
P-VOL as the specified 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).
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 flagged 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
flagged 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 flagged 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 offline
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
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 figure 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 first layer of BC pairs. Pairs created
in the first and second layer are called cascaded pairs. Figure 12 illustrates cascaded BC volume pairs.
The first 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 first 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.
32
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 first 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 first 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=0becausethisisthefirst 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 classified
using the following terms (as shown in the previous figure):
• 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 first 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
• 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 identifies 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
PSUSOKOKOK
COPY(RS)OK
COPY(RS-R)OK
PSUEOK
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-EPairsplit-S
OKOK
OKOK
OKOK
OKOK
OKOK
OKOK
OKOK
OKOK
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-EPairsplit-S
Quick
Restore
COPY(PD)OK
PAIR
COPY(SP)
PSUS(SP)
PSUSOK
COPY(RS)OK
COPY(RS-R)
PSUEOK
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
OKOKOKOKOK
OKOKOKOKOK
2
NO
(CMD RJT)NO(CMD RJT)
2
NO
(CMD RJT)NO(CMD RJT)
NO
(CMD RJT)
NO
(CMD RJT)
OKOK
OKOK
OKOKOKOKOK
OKOKOKOKOK
NO
2
————
(CMD RJT)
OKOKOKOKOK
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 OnlyRead OnlyRead OnlyRead OnlyRead OnlyRead Only
Read OnlyRead OnlyRead OnlyRead OnlyRead OnlyRead Only
Read OnlyRead OnlyRead OnlyRead OnlyRead OnlyRead Only
Read/ WriteRead/ WriteRead/ WriteRead/ WriteRead/ WriteRead/ Write
Read OnlyRead OnlyRead OnlyRead OnlyRead OnlyRead Only
Read OnlyRead OnlyRead OnlyRead OnlyRead OnlyRead Only
Read OnlyRead OnlyRead OnlyRead OnlyRead OnlyRead 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 OnlyRead OnlyRead 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-defined 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 configure up to 128 consistency groups in a disk array, including BC consistency groups.
• Anumber(0
number whe
number automatically.
• You can define 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 Configuration and Security Manager XP user guide for theXP12000/XP10000.
• BC pairs
• To configure BC consistency groups, use the RAID Manager software. However, to confirm 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 OnlyRead 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 figure 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. Define a consistency group for BC pairs. You cannot define 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
• 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 defined. If
youexecutethepaircreatecommandwiththeAt-TimeSplitoption(-m)undertheseconditions,the
paircreate command might be rejected. In this case, first findaconsistencygroupnumberthatisnot
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 defined in the RAID Manager configuration file. 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 first I/O to each logical unit (LU) can be up to approximately
five seconds in the worst case. This worst case should be in a one-to-three BC pair situation and 36
LDEV LUSE configuration.
Pair status
The BC remote console software displays the pair status of all BC volumes (LUs) on the specified port of
the connected disk array. The following figure 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:
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.
38
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 StatusDescriptionS-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 first 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
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 configuration 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 first 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
configurations.
• 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 first
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 configuration 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 configuration 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 configuration 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 configuration 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 configuration 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
nfiguration shown in Figure 17, you cannot perform the Business Copy XP and Continuous
P Journal copy operations at the same time. In Figure 17, first 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
configuration 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
Reverse resync and quick restore operations cannot be performed on BC/Continuous Access XP shared
volume pairs.
The configuration 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 configuration, 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 configuration 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 configuration, 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 file.
The configuration 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 configuration, you can perform the following:
• 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 configuration 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 configuration, 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 first, 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 configuration, 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 configuration, 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
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-VOLS-VOL
OKOK
OK
OK
OK
Availability of BC operations
P-VOLS-VOL
OK
OK
1
OK
OK
NONO
OK
OKOK
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 VMAVolume 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
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 insufficient, 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 first 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 defined 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 filter 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 filter 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 defined 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
IconLDEV 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 specified, 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 specified operations displayed in the Preset Volume list.
• Volume: Total number of volumes defined 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 filter 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 defined 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 defined in the disk array exceeds 1,024, which is the maximum number of
volumes t
defined vo
• The Apply button performs BC operations displayed in the Preset Volume list in the disk array. If
the specified operations complete successfully, the Preset Volume list is cleared. If an error occurs
during a
code an
• The Cancel button cancels all operations specified 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 defined 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 filter 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 first 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
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
SMPLCOPY
(PD)
YesYesYesYesYesYesYesYesYes
NoNoNoNoNoNoNoNo
YesYesYes
c
NoNoNoNo
No
No
Yes
No
YesYesYesYesYesYesYes
YesYesYes
NoNoNoNoNoNoNoNo
YesYesYesYesYesYesYesYes
PAIR
COPY
(SP)
NoNoNoNoNoNo
PSUS
PSUSCOPY
(SP)
YesYes
No
YesYesYes
COPY
(RS)
NoNo
(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 defined 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 filt
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:
• 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 specified 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 specified 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 specified 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 first 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 XPuser 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 specified 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 reflecting 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
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 reflected in the Preset Volume list on the BC main screen.
6. From the BC main screen, click Apply.
7. Verify that the settings are reflected 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 reflecting 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.
62
Business Copy XP (BC) for the Array
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 reflected in the Preset Volume list on the BC main screen.
6. In the BC main screen, click Apply.
7. Verify that the settings are reflected 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
Business Copy XP user guide
63
•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 first 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 specified in the Paircreate window is in effect before the settings
are reflected 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.
64
Business Copy XP (BC) for the Array
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 filters 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 defined 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 defined 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 defined 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
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 filter 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 reflect 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.
66
Business Copy XP (BC) for the Array
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 reflect 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
Business Copy XP user guide
67
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 first 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)
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 fi 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.
• Attribu
68
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.
Business Copy XP (BC) for the Array
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 defined 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 defined 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 defined 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 defined 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
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.
Business Copy XP user guide
69
2. In the BC main screen, select the port, host group, or P-VOL in the Tree View box to filter 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.
2. In the BC main screen, select the port, host group, or P-VOL in the Tree View box to filter 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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Business Copy XP (BC) for the Array
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 reflect 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 first 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
Business Copy XP user guide
71
• 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 specified pairs to the Preset List on the BC main screen.
k Apply on the BC main pane to start the pairresync operation for the specified 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 filter 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 configuration information. To update the information in the user interface, wait
for the quick restore operation to finish, and click Refresh.
CAUTION:
Ensure that the correct resync direction (normal/quick, or reverse/quick restore) is selected.
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Business Copy XP (BC) for the Array
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.
• 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 offlinebeforestartingpairresyncoperations.
6. In the BC main screen, click Apply to resync the specified 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 reflect the settings to the Preset
the BC main screen, click the port, host group, or P-VOL in the Tree View box to filter 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
Business Copy XP user guide
73
4. Repeat step 2 — step 3 to suspend additional pairs in the list.
5. In the BC main screen, click Apply to suspend the specified 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 offline to prevent the
P-VOL from being updated during or after the pairsplit-S operation.
b. After the P-VOL is offline, 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 filter 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 reflect the settings to the Preset
Volume list on the BC main screen.
5. In the BC main screen, click Apply to delete the specified 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 - 471FPAIR START
4720 - 472FPAIR END
4730 - 473FPSUS START
4740 - 474FPSUS END
4750 - 475FCOPY(RS) STARTCOPY(RS-R)
4760 - 476FCOPY(RS) ENDCOPY(RS-R)
4780 - 478FS MPL
4790 - 479F
47A0 - 47AFCOPY WARNING END
47B0 - 47B
47C0 - 47CFCOPY 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 - 47DFCOPY ABNORMAL END
47E7COMPULSION PAIR
47E9SI SM INITIALIZATION START
47EASI SM INITIALIZATION END
47EBSI 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)
ReferenceCodeunknownThereferencecodeisunknown.
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 five-minute interval (one report per five
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 specified 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.
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 specified command cannot be accepted in
this status. (The command was rejected.)
The specified command is treated as an NOP.The specified 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 five seconds later.
A retry may result in a normal termination. Retry
about five 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,
confirm the specified 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.
Business Copy XP user guide
77
Error
Code
0 818
081F
0830
0831
DescriptionCorrective 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 (offline 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 specified P-VOL is not
supported by BC.
The emulation type of the specified 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
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
DescriptionCorrective 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 specified to be a
Reserve volume has already been used for a
Reserve volume.
The number of the volume specified to be a
Reserve volume has already been used for a
primary BC volume.
The number of the volume specified 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 specified to be a
Reserve volume has already been used for a
hierarchical control destination volume.
The volume specified 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 specified as P-VOL
is node volume already.
It is impossible to make a pair because the
volume that was specified as P-VOL is leaf
volume already.
It is impossible to make a pair because the
volume that was specified as S-VOL is leaf
volume already.
P-VOLisusedassourcevolumeforHIHSM.Confirm a matching condition.
P-VOL is used as destination volume for HIHSM.Confirm a matching condition.
The specified P-VOL number does not exist.Retry after refreshing the screen.
The specified P-VOL has been set as a Reserve
volume.
No more pairs can be created for the specified
P-VOL.
an appropriately be allocated
oes not exist among Reserve
ssible to make a pair any more
the volume that was specified 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.
Confirm 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
DescriptionCorrective Action
The specified P-VOL is not really a P-VOL.
The specified 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 specified 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 specified S-VOL does not exist.
S-VOLisusedasdestinationvolumeforHIHSM. Confirm a matching condition.
The speci
used as th
The specified S-VOL is not a BC S-VOL.
The specified secondary volume is being used
as a CA P-VOL.
ble to make a pair because volume
ified as S-VOL is node volume
fied S-VOL number has already been
at of an S-VOL.
Check pair status.
Confirm a pair condition.
Confirm 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 specified 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 specified P-VOL and S-VOL are not a BC
pair.
The vol
S-VOL a
Requestcouldnotbeaccepted
Requestcouldnotbeaccepted
S-VOLisnodevolumewhoseL2statusis
SP-Pend.
The status mode specification (status modec) in
the Status Check command is incorrect.
ified secondary volume is being used
VOL.
me specified as a Reserve volume is
sed as a CA P-VOL.
ume numbers of the specified 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
Confirm a matching condition.
Confirm a matching condition.
Confirm
Call HP technical support for assistance.
a matching condition.
80
Business Copy XP (BC) for the Array
Error
Code
1071
1072
DescriptionCorrective Action
The status classification (statusindc) in the Status
Check command is incorrect.
The CU number specified 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.
Confirm a matching condition.
Confirm a mat
Confirm a matching condition.
Confirm a matching condition.
Confirm a matching condition.
Confirm a matching condition.
Confirm a matching condition.
Confirm
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
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