HP StorageWorks P9000 Business Copy User Guide
HP StorageWorks
P9000 Business Copy User Guide
Abstract
This guide explains how to use HP StorageWorks P9000 Business Copy Software to create nondisruptive, high-speed internal
copies of information stored by open-systems hosts on HP Storage Works P9000 disk arrays and attached heterogeneous
external storage systems. Topics include how to create, split, suspend, resynchronize, and troubleshoot Business Copy pairs
using the Remote Web Console web client. The intended audience is a storage system administrator or authorized service
provider with independent knowledge of HP StorageWorks P9000 disk arrays and the HP StorageWorks Remote Web Console.
HP Part Number: AV400-96342
Published: January 2011
Edition: Third
© Copyright 2010, 2011 Hewlett-Packard Development Company, L.P.
Confidential computer software. Valid license from HP required for possession, use or copying. Consistent with FAR 12.211 and 12.212, Commercial
Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under
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The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express
warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall
not be liable for technical or editorial errors or omissions contained herein.
Acknowledgements
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Revision History
DescriptionDateEdition
Applies to microcode version 70-01-01-00/00 or later.October 2010First
Applies to microcode version 70-01-24-00/00 or later.November 2010Second
Applies to microcode version 70-01-62-00/00 or later.January 2011Third
Contents
1 Business Copy overview..............................................................................5
Business Copy software.............................................................................................................5
How Business Copy works.........................................................................................................5
Hardware and software components ..........................................................................................5
Volume pairs (P-VOLs and S-VOLs)..........................................................................................6
Cascaded pairs .............................................................................................................6
Remote Web Console GUI....................................................................................................7
RAID Manager and consistency groups..................................................................................7
Initial and update copy operations..............................................................................................7
Initial copy..........................................................................................................................8
Update copy.......................................................................................................................8
2 Requirements and planning.......................................................................10
System requirements................................................................................................................10
License capacity requirements..................................................................................................11
Planning pair volumes.............................................................................................................11
Planning number of pairs....................................................................................................12
Calculating number of differential, pair tables...................................................................12
Calculating maximum number of pairs ............................................................................13
Organizing volumes into P-VOLs and S-VOLs.........................................................................15
Planning for performance .......................................................................................................15
System options.......................................................................................................................16
3 Sharing Business Copy volumes..................................................................18
Open Volume Management.....................................................................................................18
Cache Residency....................................................................................................................18
LUN Manager........................................................................................................................18
Data Retention.......................................................................................................................18
Auto LUN .............................................................................................................................18
External Storage ....................................................................................................................19
Continuous Access Synchronous...............................................................................................19
Continuous Access Journal.......................................................................................................19
Continuous Access Synchronous and Continuous Access Journal...................................................19
Thin Provisioning....................................................................................................................20
4 Performing configuration operations............................................................22
Configuration workflow ..........................................................................................................22
Set up primary and secondary volumes.....................................................................................22
Reserve S-VOLs......................................................................................................................22
Set Host I/O Performance option..............................................................................................23
5 Performing pair operations........................................................................25
Pair operations workflow.........................................................................................................25
Check pair status....................................................................................................................25
Create pairs..........................................................................................................................25
Split, create and pairs.............................................................................................................27
Splitting consistency group pairs with At-Time Split.................................................................30
Suspend pair creation.............................................................................................................30
Contents 3
Resynchronize pairs................................................................................................................32
Delete pairs...........................................................................................................................34
6 Monitoring and maintaining the system.......................................................36
Monitoring the system ............................................................................................................36
Monitoring pair activity, status ............................................................................................36
Pair status definitions.....................................................................................................36
Operations permitted for L1, L2 pairs ..............................................................................37
Reviewing pair, volume details.............................................................................................38
Reviewing S-VOL path information........................................................................................40
Reviewing pair, license information ......................................................................................41
Reviewing a pair’s operation history.....................................................................................43
Maintaining the system............................................................................................................44
Remove reserve attribute from a volume................................................................................44
Pair operations during system, device maintenance.................................................................45
When maintaining physical and logical devices................................................................45
When switching power off..............................................................................................46
7 Troubleshooting........................................................................................47
General troubleshooting..........................................................................................................47
Troubleshooting with RAID Manager.........................................................................................47
Troubleshooting the At-Time Split operation...........................................................................54
8 Support and other resources......................................................................56
Contacting HP........................................................................................................................56
Subscription service............................................................................................................56
Related information.................................................................................................................56
HP websites......................................................................................................................56
Conventions for storage capacity values....................................................................................57
Typographic conventions.........................................................................................................57
HP product documentation survey.............................................................................................58
A Business Copy GUI reference.....................................................................59
Pair Operation Window..........................................................................................................59
Main Components ............................................................................................................59
Volume List........................................................................................................................60
Preview List.......................................................................................................................62
Pair Operations command menu..........................................................................................62
Display Filter dialog box.....................................................................................................63
History window......................................................................................................................64
Option window......................................................................................................................65
Glossary....................................................................................................67
Index.........................................................................................................70
4 Contents
1 Business Copy overview
Unless otherwise specified, the term P9000 in this guide refers to the following disk array:
• P9500 Disk Array
The GUI illustrations in this guide were created using a Windows computer with the Internet Explorer
browser. Actual windows may differ depending on the operating system and browser used. GUI
contents also vary with licensed program products, storage system models, and firmware versions.
Business Copy uses local mirroring technology to create and maintain a full copy of any volume
in the storage system.
This guide provides instructions for planning, pair operation, checking operational status, and
troubleshooting.
Business Copy software
With Business Copy software you create multiple copies of a data volume within the same storage
system. Business Copy backup data volumes can be used as backups or with target host
applications, data mining applications, and for testing — while the source business operations
continue to run at full capacity with the source data volume.
How Business Copy works
A pair is created when you:
• Select a volume that you want to duplicate. This will become the primary volume.
• Identify another volume to contain the copy. This will become the secondary volume.
• Associate the source and secondary volumes.
• Perform the initial copy.
During the initial copy, the primary volume (P-VOL) remains available for read/write. After the
copy is completed, subsequent write operations to the P-VOL are regularly duplicated to the
secondary volume (S-VOL).
The P-VOL and S-VOL remain paired until they are split. When the pair is split, the primary volume
continues to be updated, but data in the secondary volume remains as it was at the time of the
split. The S-VOL contains a mirror image of the original volume at that point in time.
• S-VOL data is consistent and usable. It becomes available for read/write access by target
host applications.
• Changes to the P-VOL and S-VOL are managed by differential bitmaps.
• The volumes can be paired again by re-synchronizing the update data from P-VOL-to-S-VOL,
or from S-VOL-to-P-VOL, as circumstance dictates.
Hardware and software components
A typical configuration consists of a P9500 storage system, a host connected to the storage system,
Business Copy software, a primary volume, a secondary volume or volumes, and interface tools
for operating Business Copy.
Interface tools include HP Remote Web Console graphical user interface (GUI) and RAID Manager.
Business Copy software 5
Figure 1 Business Copy configuration
Volume pairs (P-VOLs and S-VOLs)
A pair consists of the primary and secondary data volumes. Each P-VOL can be paired with up to
three S-VOLs. Thus, you can create three pairs using one P-VOL.
During most operations, the P-VOL remains available to the host for I/O operations. When the
P-VOL is updated, the new data, called differential data, is copied to the S-VOL regularly. Because
S-VOLs are updated asynchronously, the P-VOL and S-VOL may not be identical. S-VOLs become
available for host access only after the pair has been split or deleted.
Cascaded pairs
Each Business Copy S-VOL can be further paired with a second level S-VOL. A first level (L1) S-VOL
may be paired with two second level (L2) S-VOLs. Thus, up to nine S-VOLs can be available for
one P-VOL.
L2 pairs are referred to as "cascaded pairs."
6 Business Copy overview
Figure 2 Structure of cascaded pairs
• The P-VOL of the L1 pair is the "root volume."
• An S-VOL of the L1 pair is a "node volume."
• A P-VOL of an L2 pair is an L1 S-VOL — a node volume.
• An S-VOL of an L2 pair is a "leaf volume."
Business Copy cascaded pairs may be used as Continuous Access Synchronous pairs. No distinction
is made in Continuous Access Synchronous between node and leaf volumes. Both are considered
as S-VOLs.
Remote Web Console GUI
The Remote Web Console GUI communicates with the storage system’s service processor (SVP)
over defined TCP/IP connections. Remote Web Console is LAN-attached to the system.
With the GUI, you enable the Business Copy license key, configure the system, perform copy
operations, and perform monitoring, maintenance, and troubleshooting.
RAID Manager and consistency groups
RAID Manager can be used to perform most of the same operations as with Remote Web Console,
but using a command line interface. Pair operation commands are issued directly from the host.
Business Copy pair operations can also be automated with RAID Manager using scripts.
Using RAID Manager, you can specify multiple pairs as a consistency group. With a consistency
group, pair operations can be performed on multiple pairs at one time. This also allows you to
change the pair status for all the pairs in a group.
Initial and update copy operations
When you create a pair, the system executes an initial copy. When the pair is created, the storage
system asynchronously copies updates received by the P-VOL to the S-VOL.
Initial and update copy operations 7
Initial copy
When you create a pair, the initial copy is started by the system, and all the data in the P-VOL is
copied to the S-VOL.
• Before the pair creation the pair’s status is SMPL.
• While the initial copy is in progress, the status is COPY.
• The status changes to PAIR when the initial copy is complete.
Figure 3 Initial copy operations
A P-VOL continues receiving updates from the host during the initial copy. When the initial copy
is completed, update copy operations start.
Update copy
I/O sent to the P-VOL in PAIR status is marked as differential data and stored in bitmaps for transfer
to the S-VOL. Update copy operations are performed periodically by the system. The timing of the
update copy operation is based on the amount of differential data that accumulates and the elapsed
time since the previous update.
8 Business Copy overview
Figure 4 Update copy operations
Although an initial copy completes and pair status changes to PAIR, the data in the P-VOL and
S-VOL may not be the same because the copy of the update data is performed asynchronously.
To insure that P-VOL and S-VOL data are the same at a certain point in time, the pair must be split.
CAUTION: If the copy operation is completed without any host I/O, the data in the P-VOL and
the data in the S-VOL may not be the same. To make the P-VOL data and the S-VOL data equal,
split the pair and make the pair status PSUS.
Initial and update copy operations 9
2 Requirements and planning
This chapter describes system requirements and recommendations for planning a Business Copy
system.
System requirements
The following table shows minimum requirements for Business Copy.
Table 1 System Requirements
RequirementItem
Based on purchased capacity. See “License capacity requirements” (page 11).Business Copy license
capacity
Must be installed. See HP StorageWorks P9000 Remote Web Console User Guide for
instructions.
License key
RAID 1, RAID 5, RAID 6RAID level
If you use Remote Web Console, it is necessary to be in Modify mode to perform pair
operations.
Remote Web Console
RAID Manager requires a command device. See the HP StorageWorks P9000 RAID
Manager User Guide for more information.
RAID Manager
• Number of P-VOLs per S-VOL: one
• Number of S-VOLs per P-VOL:
For L1 pairs, a maximum of three S-VOLs per P-VOL.
For L2 pairs, a maximum of two S-VOLs per P-VOL.
(For information on pair-layers, see “Cascaded pairs ” (page 6)).
• Volume Capacity. P-VOL and S-VOL must have the same capacity.
• Supported Emulation Types. Emulation types is the same as those of SMPL.
• Supported Volume Types
- Internal system volumes.
- External volumes. External Storage license required.
- Custom-sized volumes. VLL required. Pair volumes must have same capacity and
emulation type
- LUSE volumes require LUSE license. Business Copy S-VOLs must have the same size
and structure as the P-VOL. For example, if the P-VOL is a LUSE volume in which volumes
of 1 GB, 2 GB, and 3 GB are combined in this order, the S-VOL must also be a LUSE
volume with volumes of 1 GB, 2 GB, and 3 GB combined in the same order.
• MU number (mirror unit number).
- For an L1 pair, use 0, 1, or 2.
- For an L2 pair, use 1 or 2.
• Sharing volumes with other program products is supported. See “Sharing Business
Copy volumes” (page 18).
• The following cannot be used as pair volumes:
- Continuous Access Journal journal volumes.
- Virtual volumes (except Thin Provisioning volumes).
- Pool volumes.
Pair volumes
10 Requirements and planning
Table 1 System Requirements (continued)
RequirementItem
Maximum number possible per storage system is 16,384 pairs (when one S-VOL per
P-VOL). Actual number is based on amount of additional shared memory. See “Planning
number of pairs” (page 12) for further information.
Maximum number of pairs decreases if LUSE volumes are used.
Maximum Number of Pairs
• You can configure up to 128 consistency groups in a storage system, including Business
Copy consistency groups and Snapshot consistency groups.
Note: Business Copy Z pairs, and Snapshot pairs cannot co-exist in the same consistency
group.
• You can define up to 8,192 Business Copy pairs in a consistency group.
Note: LUSE volumes that contain n LDEVs should be counted as n volumes. For further
information on LUSE volumes, see HP StorageWorks P9000 Provisioning for Open
Systems User Guide.
• A number (0–7F) is assigned to each consistency group. You can specify a consistency
group number when you create Business Copy pairs, or if you do not specify a number,
the storage system assigns a number automatically.
Consistency groups
License capacity requirements
The total capacity of your pair volumes must be less than the maximum volume capacity licensed
to you.
After operations begin, you should be aware of capacity requirements in order to keep volumes’
total size within purchased capacity.
• P-VOLs, S-VOLs, and volumes that have been reserved for use as S-VOLs must have licensed
capacity. The total of these volumes capacity must not be more than licensed capacity.
• Snapshot P-VOLs and pool volumes require the Business Copy license capacity.
• The capacity of a volume used for multiple purposes is counted only once; there is no need
to multiply the capacity by the number of purposes it is used for.
• When a Thin Provisioning volume is used as a Business Copy P-VOL or S-VOL including a
reserved volume, the capacity of the Thin Provisioning pool is added to the Business Copy
license capacity. The reason is because Thin Provisioning volumes are not updated in real
time. As a result, some write requests may cause data excess, which is saved in the pool.
When your Business Copy volumes exceed license capacity, you are allowed to use the
volumes for additional 30 days. After that, Business Copy operations can no longer be
performed, except for deleting pairs.
Planning pair volumes
You must create volumes for P-VOLs and S-VOLs prior to creating pairs. Review system requirements
for pair volumes in Table 1 (page 10). Also, the following options can be used:
• Before you create a pair, you can reserve a volume as an S-VOL. This insures that no I/O
occurs in the reserved volume before creating a pair. Reserved volumes may only be used as
S-VOLs.
• If you use , you can place a group of pairs in a consistency group. Using the consistency
group, you can perform pair operations on all the pairs in the group at the same time, including
the At-Time Split operation with which you can specify the split time. See the HP StorageWorks
P9000 RAID Manager User Guide for information on setting up consistency groups and
performing pair operations.
License capacity requirements 11
Planning number of pairs
This section provides instructions for calculating the number of system resources required for one
Business Copy pair. With this information you can calculate the maximum number of pairs.
When you create pairs, differential tables (tables managing differential bitmaps) and pair tables
are required. These must be available in sufficient number to handle all the pairs you will create.
The number of differential and pair tables that are present in the system depends on additional
shared memory that is installed. Therefore, you must insure that you have sufficient additional
shared memory to handle the number of pairs.
The following table shows the number of differential and pair tables and the number of volumes
allowed per additional shared memory. The maximum number of pairs is half the number of volumes
shown, when P-VOLs and S-VOLs are in a one-to-one relationship.
For example, if additional shared memory is not installed, since the number of volumes is 16,384,
then the number of pairs you can create is 8,192. This example assumes one S-VOL per P-VOL. If
there are more S-VOLs than P-VOLs, then the number of allowed pairs decreases.
However, for Extension 1 and Extension 2, the maximum number of pairs is 16,384, regardless
of the total number of system volumes.
Table 2 Differential tables, pair tables and additional shared memory
Number of System
Volumes
Number of Pair TablesNumber of Diff. TablesAdditional Shared Memory for Business
Copy
16,3848,19226,176Base (No additional shared memory)
65,53616,384104,768Extension 1
65,53616,384209,600Extension 2
You can determine the maximum number of pairs which can be created on your system by
calculating the number of differential and pair tables your system needs to create Business Copy
pairs. This number must be equal to or less than the difference of the total number of differential
and pair tables in the storage system minus the number of tables being used by the other products
such as Compatible FlashCopy.
The following program products also use differential tables:
• Compatible FlashCopy
• Auto LUN
• Snapshot
The following program products also use pair tables:
• Compatible FlashCopy
• Auto LUN (using migration plans)
Calculations in the following sections assume only Business Copy is used in the system.
NOTE: You can use the ’s inqraid command to query the number of differential tables required
when you create Business Copy pairs. You can also query the number of the differential tables not
used in the storage system by using this command. For details about the inqraid command, see
the HP StorageWorks P9000 RAID Manager User Guide.
Calculating number of differential, pair tables
The emulation type of your volumes affects the number of differential and pair tables.
12 Requirements and planning
To calculate the number differential and pair tables except for OPEN-V
Total number of differential tables per pair = ((volume capacity KB ÷ 48) + (number of the control
cylinders* × 15) ÷ (20,448**)
* See the following table.
** Number of the slots that can be managed by a differential table
Round up the total number to the nearest whole number. For example, if the number of the cylinders
of the divided volume is 2,403,360 KB , the calculation of the total number of the differential tables
is as follows.
↑ (2,403,360 ÷ 48 + 8 × 15) ÷ 20,448 = 2.4545...
When you round up 2.4545 to the nearest whole number, it becomes 3. In this example, the total
number of the differential tables for one pair is 3. Because one pair table is used for up to 36
differential tables, the total number of the pair tables for a pair in this example is 1.
To calculate the number differential and pair tables for OPEN-V
Total number of the differential tables per pair = (volume capacity KB ÷ 256) ÷ 20,448*
* Number of the slots that can be managed by a differential table
Round up the total number to the nearest whole number. For example, if the number of the cylinders
of the divided volume is 3,019,898,880 KB , the calculation of the total number of the differential
tables is as follows.
↑ (3,019,898,880 ÷ 256) ÷ 20,448 = 576.9014...
When you round up 576.9014 to the nearest whole number, it becomes 577. In this example,
the total number of the differential tables for one pair is 577. Because one pair table is used for
up to 36 differential tables, the total number of the pair tables for a pair is 17. (Only OPEN-V can
use more than one pair table per pair.)
Table 3 Control cylinders per emulation type
Number of control cylindersEmulation type
8 (5,760KB)OPEN-3
27 (19,440KB)OPEN-8, OPEN-9
19 (13,680KB)OPEN-E
9 (6,480KB)OPEN-K
7 (5,040KB)OPEN-L
0 (0KB)OPEN-V
9 (6,480KB)NFOP-K
If the volume is divided by VLL, use the volume capacity after the division. Note that VLL operations
cannot be performed on OPEN-L volumes.
Having determined the number of differential and pair tables required per pair on your storage
system, you can now calculate the maximum number of pairs.
Calculating maximum number of pairs
Finding the number of pairs which can be created on your system depends on whether you use
LUSE volumes or not. Two calculations are provided below, one without LUSE, and one with LUSE.
To calculate the maximum number of pairs allowed on your system without LUSE volumes
Use the following formula:
Planning pair volumes 13
Σ {(α) x (the number of Business Copy pairs)} ≤ (β) and Σ {(γ) x (the number of Business Copy
pairs)} ≤ (δ)
where:
• (α): Required number of differential tables per pair (per previous calculation).
• (β): Number of differential tables available in the system (Table 2 (page 12)).
• (γ): The required number of pair tables per pair (per previous calculation).
• (δ): The number of pair tables available in the system (Table 2 (page 12)).
For example, if you are to create 10 pairs of OPEN-3 volumes and 20 pairs of OPEN-V volumes
in a storage system that has 26,176 differential tables, you can use the equation as follows:
When the emulation type is OPEN-3, and if the capacity of the volume is 2,403,360 kB, the
number of differential tables required for a pair will be 3, and the number of pair tables required
for a pair will be 1. When the emulation type is OPEN-V, and if the capacity of the volume is
3,019,898,880 kB, the number of differential tables required for a pair will be 577, and the
number of pair tables required for a pair will be 17.
If you apply these numbers in equation:
3 x 10 + 577 x 20 = 11,570 less-than-or-equal-to 26,167 and also
1 x 10 + 17 x 20 = 350 less-than-or-equal-to 8,192
Thus, 10 pairs of OPEN-3 volumes and 20 pairs of OPEN V volumes can be created.
To calculate the maximum number of pairs allowed on your system with LUSE volumes
Σ[Σ {(α) x (the number of the volumes that forms LUSE volumes)} x (the number of Business Copy
pairs)] ≤ (β)
and also
Σ[Σ {(γ) x (the number of the volumes that forms LUSE volumes)} x (the number of Business Copy
pairs)] ≤ (δ)
where:
• (α): Required number of differential tables that forms LUSE volume.
When you use LUSE volumes, each volume forming the LUSE volume uses the differential
tables. For example, if you create a Business Copy pair using LUSE volumes, which are created
by combining two OPEN-V volumes, you need differential tables for two OPEN-V pairs.
• (β): Number of differential tables available in the system (Table 2 (page 12)).
• (γ): The required number of pair tables for each volume that forms a LUSE volume.
• (δ): The number of pair tables available in the system (Table 2 (page 12)).
For example, if you are to create 10 pairs of LUSE volumes consisting respectively of three OPEN-3
volumes in a storage system that has 26,176 differential tables, you can use the condition inequation
as follows:
When the emulation type is OPEN-3, and if the capacity of the volume is 2,403,360 kB, the
number of differential tables required for a pair is 3, and the number of pair tables required for a
pair will be 1.
If you apply this number to the above-mentioned inequation:
(3 x 3) x 10 = 90 <= 26,176
and also
(1 x 3) x 10 = 30 <= 8,192
Therefore, you can see that 10 Business Copy pairs, which are formed by three OPEN-3, volumes
can be created.
14 Requirements and planning
Organizing volumes into P-VOLs and S-VOLs
Before creating pairs, it is necessary to prepare volumes for Business Copy. The following table
provides an example of volume information to prepare volumes.
Table 4 Volume information for Business Copy
Associated L2
P-VOL
Associated
L2 S-VOLs
Associated L1
P-VOLs
Associated L1
S-VOLs
Pair Volume
Type
GID:
LUN
PortCU
NANANA1B-0:00,
2A-0:00,
2B-0:00
L1 P-VOL0:001A0
NANANA1B-0:01,
2A-0:01,
2B-0:01
L1 P-VOL0:011A0
NANANANANANANAetc...
NA3A-0:00,
3A-0:01
1A-0:00NAL1 S-VOL
L2 P-VOL
0:001B0
NA3B-0:00,
3B-0:01
1A-0:00NAL1 S-VOL
L2 P-VOL
0:011B0
NANANANANANANAetc...
NA4A-0:00,
3B-0:01
1A-0:00NAL1 S-VOL
L2 P-VOL
0:002A0
NA4B-0:00,
3B-0:01
1A-0:00NAL1 S-VOL
L2 P-VOL
0:012A0
NANANANANANANAetc...
1B-0:00NANANAL2 S-VOL0:003A0
1B-0:00NANANAL2 S-VOL0:013A0
Planning for performance
Pair operations affect I/O performance on the storage system. The following information is provided
to help calibrate your system:
• Performance versus number of pairs. Compare the importance of performance with the number
of pairs and copy pace (rate at which data is copied).
◦ Assigning multiple S-VOLs to a P-VOL uses more system resources and lowers performance.
◦ The slower the copy pace, the less impact on I/O performance; a fast pace has a greater
impact on performance. (You assign copy pace during the create, split, and resync
operations.)
• Load sharing on parity groups.
A parity group should contain an even distribution of P-VOLs and S-VOLs, rather than a
concentration of one or the other.
◦
◦ When multiple pair operations are to be performed simultaneously, the pairs should be
in different parity groups.
Planning for performance 15
◦ For copy pace, specify Slower when you create, split, or resynchronize.
◦ When you need to perform a copy operation on multiple pairs on the same parity group,
perform the operation on one pair at a time.
◦ If the system is overloaded, increase parity groups, cache, and/or DKAs. Assign S-VOLs
to newly installed parity groups.
• When using multiple program products simultaneously. If you are using more than program
product at the same time, ensure that your storage system is configured for optimal performance
(for example, sufficient cache). Contact HP Technical Support. Concurrent use affects the
performance and the operation of the other program products.
• When using AIX host servers. Best performance results when P-VOLs are located on one AIX
host server and paired S-VOLs on another. The problem with using one AIX host server for
both P-VOLs and S-VOLs is that during the paircreate or pairresync operation, the P-VOL and
S-VOL have the same PVID. If the host server reboots when this is the case, it can mis-identify
the volumes and identify the S-VOL as the P-VOL after rebooting.
• Preparing for resynchronization by Quick Restore. During a quick restore operation, in which
the contents of the P-VOL and S-VOL are swapped, the RAID levels, HDD types, and Cache
Residency settings of the two volumes are also exchanged. To avoid performance impact,
consider the following:
◦ Both pair volumes should have the same RAID level and HDD type before performing the
quick restore operation. You can resume the original RAID levels after the quick restore
by again splitting the pair and performing the quick restore.
◦ Set the same Cache Residency settings (locations) for the P-VOL and S-VOL before the
quick restore operation.
Alternatively, you can release Cache Residency settings before the quick restore operation,
then reset them when the operation is completed.
See the HP StorageWorks P9000 Performance for Open and Mainframe Systems User
Guide for more information on settings.
CAUTION: It is recommended that Quick Restore should not be performed when the P-VOL
and S-VOL are in different CLPRs. If you perform Quick Restore, the CLPR of the P-VOL and
the CLPR of the S-VOL will be reversed after Quick Restore.
System options
Business Copy provides the following options. To enable Copy Threshold option, call your service
representative. Swap&Freeze and Host I/O Performance option can be set by using Remote Web
Console.
• Swap&Freeze. This option alters the behavior of the quick restore operation. With
Swap&Freeze, update copy operations are suppressed when the quick restore is completed
and the pair is in PAIR status. Differential data is not copied to the new S-VOL. You use the
Swap&Freeze option, when you want to remain the S-VOLs of a Business Copy pair unchanged
after the quick restore operation.
• Host I/O Performance. This option increases I/O performance while suppressing Business
Copy copy processing. This results in longer copy time.
• Copy Threshold. This option temporarily stops copy operations when the workload on the
storage system is heavy. This is done to minimize degradation to host I/O performance during
peak periods.
16 Requirements and planning
NOTE: The Copy Threshold option performs only when workload is heavy; The Host I/O
Performance option suppresses copy operations at all times regardless of workload level.
When the Copy Threshold Option is set, the option is effective for all of the following program
product:
◦ Business Copy
◦ Business Copy Z
◦ Compatible FlashCopy
◦ Snapshot
◦ Auto LUN
System options 17
3 Sharing Business Copy volumes
Business Copy volumes can be shared with other HP program products. This chapter discusses
requirements, recommendations, and restrictions for using Business Copy with other products.
Open Volume Management
Both LUSE and Virtual LUN volumes can be used as Business Copy volumes.
• With LUSE volumes, the P-VOL and S-VOL must have the same configuration (the same LU
capacity and the same number of LUs).
• With Virtual LUN volumes, the P-VOL and S-VOL must have the same capacity.
Cache Residency
Volumes with Cache Residency settings can be used as Business Copy P-VOLs and S-VOLs.
NOTE: See the bullet on Quick Restore in “Planning for performance ” (page 15) for important
information about performing quick restore operations on volumes that have Cache Residency
settings.
LUN Manager
LUN Manager operations do not affect Business Copy operations. Volumes that are under secure
ports and/or that are assigned to World Wide Name (WWN) groups and/or LUN groups can
also be assigned to Business Copy pairs. Volumes that are assigned to Business Copy pairs can
also be used in LUN Manager operations, such as assignment to WWN groups, and/or LUN
groups.
Business Copy S-VOLs cannot be accessed by a host except when the pair is split.
Data Retention
You can create Business Copy pairs using volumes to which the following Data Retention’s access
attributes are set:
• Read/Write
• Read Only (Volume)
• Protect
However, a volume with the S-VOL Disable attribute cannot be used as a Business Copy S-VOL.
• The only Business Copy operation you can perform on the Business Copy S-VOL that has the
S-VOL Disable attribute is the Delete operation.
• All operations can be performed on Business Copy P-VOL that have the S-VOL Disable attribute.
Auto LUN
The following Business Copy volumes can be assigned to migration volumes of Auto LUN:
• L1 P-VOL with up to two S-VOLs.
• L2 P-VOL with one or no S-VOLs.
• Reserved volumes.
Business Copy pairs must be deleted and any reserved Business Copy S-VOLs must be un-reserved
before assigning or reserving those volumes to Auto LUN migration volumes.
Business Copy volumes cannot be used for destination volumes.
18 Sharing Business Copy volumes
Migration, destination, and reserved volumes of Auto LUN cannot be used for Business Copy pair
operations. To perform a Business Copy operations, the Auto LUN volumes must be released first.
External Storage
If Business Copy is used with External Storage, you can create pairs to use the external volumes.
For information about the external volumes, see the HP StorageWorks P9000 External Storage for
Open and Mainframe Systems User Guide.
Continuous Access Synchronous
Continuous Access Synchronous volumes can be shared with Business Copy volumes.
• You can share Business Copy P-VOLs and S-VOLs with Continuous Access Synchronous P-VOLs
and S-VOLs. However, You cannot share Business Copy S-VOLs with Continuous Access
Synchronous S-VOLs.
• When you share a Business Copy P-VOL with a Continuous Access Synchronous S-VOL, the
write operation on the Continuous Access Synchronous P-VOL takes time. Especially, when
the Business Copy pair is in the PSUS(SP) status, the write operation on the Continuous Access
Synchronous P-VOL may take extra time depending on the time for copying process of the
Business Copy pair.
• You can use both L1 and L2 pairs with Continuous Access Synchronous volumes. Both node
and leaf S-VOLs are considered secondary volumes by Continuous Access Synchronous.
• The Quick Restore operation can be performed on a Business Copy pair when the Continuous
Access Synchronous pair is suspended.
For details, see the section on sharing volumes with Business Copy in the HP StorageWorks P9000
Continuous Access Synchronous User Guide.
Continuous Access Journal
Continuous Access Journal volumes can be shared with Business Copy volumes.
• You can share Business Copy P-VOLs and S-VOLs with Continuous Access Journal P-VOLs and
S-VOLs.
• You can use both L1 and L2 pairs with Continuous Access Journal volumes. Both node and
leaf S-VOLs are considered secondary volumes by Continuous Access Journal.
• The Quick Restore operation can be performed on a Business Copy pair when the Continuous
Access Journal pair is suspended
For details, see the appendix on sharing Business Copy volumes in the HP StorageWorks P9000
Continuous Access Journal User Guide.
Continuous Access Synchronous and Continuous Access Journal
A Business Copy P-VOL can be shared with shared Continuous Access Synchronous and Continuous
Access Journal volumes in certain configurations.
External Storage 19
Figure 5 Cnt Ac-J, Cnt Ac-S, and BC shared volume configuration 1
Figure 6 Cnt Ac-J, Cnt Ac-S, and BC shared volume configuration 2
All Business Copy operations, with the following exceptions, can be performed in the Continuous
Access Synchronous and Continuous Access Journal secondary sites, irrespective of Continuous
Access Synchronous pair status. The Continuous Access Journal delta resync pair’s status must be
HOLD or HLDE.
• The Reverse Copy can only be performed only when the Continuous Access Synchronous and
Continuous Access Journal pair status is PSUE.
• The Quick Restore can not be performed.
P9500 currently does not support the configuration where Continuous Access Synchronous volumes
can be used as Continuous Access Journal volumes or vice versa. For information about when this
configuration will be supported, contact HP Technical Support.
Thin Provisioning
Thin Provisioning volumes can be used with Business Copy P-VOLs, S-VOLs, and reserved volumes
with the following restrictions:
• It is recommended that Thin Provisioning volumes are used for both the P-VOL and S-VOL.
• When a Thin Provisioning volume is used for only the P-VOL, you cannot perform Quick
Restore.
20 Sharing Business Copy volumes
• When a Thin Provisioning volume is used for only the S-VOL, you cannot perform Quick
Restore. And, it is not recommended since the S-VOL consumes the same amount of the pool
capacity as the P-VOL.
• You cannot perform Business Copy pair operations while you increase the capacity of Thin
Provisioning volumes.
• The maximum size of a Thin Provisioning volume that can be used as a Business Copy P-VOL,
S-VOL, and reserve volume is 4 TB.
Thin Provisioning 21
4 Performing configuration operations
This chapter provides configuration information and instructions.
Configuration workflow
Setup for Business Copy consists of the following:
• Making certain that primary and secondary volumes are set up correctly.
• Reserving volumes for use as S-VOLs. (Optional.)
• Setting the HOST I/O Performance option, which boosts I/O performance though copy time
slows as a result. (Optional.)
Set up primary and secondary volumes
The primary and secondary volumes must be set up prior to making copies. Insure that the volumes
you plan to use meet the requirements for pair volumes in “Planning pair volumes” (page 11).
Reserve S-VOLs
This is an optional feature that allows you to reserve SMPL volumes for use as S-VOLs. The system
rejects write I/Os to reserved volumes (except in PSUS status).
Prerequisite Information
Volumes to be reserved must be:
• In SMPL status
• Unreserved and unpaired
To reserve a volume for use as an S-VOL:
1. Set the volume or volumes that you want to reserve offline from the host.
2. Click Actions > Local Copy > Business Copy/Snapshot > Pair Operation to open the Pair
Operation window.
3. Change to Modify mode by clicking the icon.
4. In the tree, select the appropriate port or host group for the volumes you want to reserve.
Related volumes display in the volume list.
5. To show only SMPL, unreserved volumes, click Display Filter, then clear the Reserve and Pair
check boxes, select Non-Pair, and click OK.
6. In the volume list, right-click the desired SMPL volume(s), then click Change Reserve from the
menu.
The Set Reserve Attribute dialog box displays.
22 Performing configuration operations
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