HP XP Business Copy Software User Manual
HP StorageWorks
XP24000/XP20000 Business Copy Software
User Guide
Abstract
This guide explains how to use HP StorageWorks XP Business Copy Software to create nondisruptive, high-speed internal
copies of information stored by open-systems hosts on HP Storage Works XP24000 and XP20000 disk arrays and attached
heterogeneous external storage systems. Topics include how to create, split, suspend, resynchronize, and troubleshoot XP
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 XP storage systems and Remote Web Console.
HP Part Number: T5213-96034
Published: May 2011
Edition: Twelfth
© Copyright 2007, 2011 Hewlett-Packard Development Company, L.P.
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Revision History
DescriptionDateEdition
This edition applies to microcode version 60-01-31-00/00 or later.June 2007First
This edition applies to microcode version 60-02-04-00/00 or later.September 2007Second
This edition applies to microcode version 60-02-25-00/00 or later.January 2008Third
This edition applies to microcode version 60-02-48-00/00 or later.April 2008Fourth
This edition applies to microcode version 60-03-04-00/00 or later.June 2008Fifth
This edition applies to microcode version 60-03-24-00/00 or later.September 2008Sixth
This edition applies to microcode version 60-04-04-00/00 or later.December 2008Seventh
This edition applies to microcode version 60-05-00-00/00 or later.June 2009Eighth
This edition applies to microcode version 60-06-05-00/xx or later.December 2009Ninth
This edition applies to microcode version 60-07-00-00/00 or later.June 2010Tenth
This edition applies to microcode version 60-07-50-00/00 or later.October 2010Eleventh
This edition applies to microcode version 60-08-01-00/00 or later.May 2011Twelfth
Contents
1 Overview of HP StorageWorks XP Business Copy Software..............................6
XP Business Copy.....................................................................................................................6
Business Benefits.......................................................................................................................7
Feature Highlights.....................................................................................................................7
2 About XP Business Copy Operations.............................................................8
XP Business Copy Components...................................................................................................8
Volume Pairs and Consistency Groups....................................................................................9
XP Business Copy Software...................................................................................................9
License...............................................................................................................................9
RAID Manager....................................................................................................................9
XP Business Copy Operations.....................................................................................................9
Set Reserve Attribute Operation.............................................................................................9
Create Pair Operation........................................................................................................10
Split Pair Operation...........................................................................................................13
Suspend Pair Operation......................................................................................................15
Resynchronize Pair Operations.............................................................................................15
Delete Pair Operation.........................................................................................................20
Pair Status.............................................................................................................................20
XP Business Copy Options.......................................................................................................23
Swap&Freeze Option.........................................................................................................23
Host I/O Performance Option..............................................................................................24
Copy Threshold Option.......................................................................................................24
3 Interoperability with Other Products and Functions........................................26
Open Volume Management.....................................................................................................26
Cache Residency Manager......................................................................................................26
LUN Manager........................................................................................................................26
Data Retention Utility...............................................................................................................26
XP Auto LUN..........................................................................................................................27
HP StorageWorks XP External Storage Software..........................................................................28
XP Continuous Access.............................................................................................................28
XP Continuous Access Journal..................................................................................................31
XP Continuous Access and XP Continuous Access Journal.............................................................34
HP StorageWorks XP Thin Provisioning Software.........................................................................37
VERITAS NetBackup DataCenter...............................................................................................39
4 Preparing for XP Business Copy Operations.................................................40
System Requirements...............................................................................................................40
Volume Requirements..........................................................................................................40
XP Business Copy Software Requirements..............................................................................41
License Requirements..........................................................................................................41
Requirements for RAID Manager..........................................................................................43
Assessing Requirements...........................................................................................................43
Calculating Maximum Number of Pairs.................................................................................43
Calculation of the Number of Differential Tables and Pair Tables Required for One Pair..........44
Conditions for the Number of XP Business Copy Pairs That Can Be Created (When No LUSE
Volume Exists)...............................................................................................................46
Contents 3
Conditions for the Number of XP Business Copy Pairs That Can Be Created (When LUSE
Volume Exists)...............................................................................................................47
Performance Considerations................................................................................................48
Identifying the Source and Target Volumes............................................................................49
Requirements for Maintaining XP Business Copy.........................................................................50
Cautions on Maintaining the Devices....................................................................................50
Cautions on Maintaining the Cache.....................................................................................51
Cautions on Switching Off the Power Supply..........................................................................51
Installing XP Business Copy......................................................................................................51
Starting XP Business Copy........................................................................................................52
5 Using the XP Business Copy GUI................................................................53
Pair Operation Window..........................................................................................................53
Volume List........................................................................................................................54
Preview List.......................................................................................................................57
History Window.....................................................................................................................59
Option Window.....................................................................................................................61
6 Performing XP Business Copy Operations.....................................................62
Configuring the Volume List......................................................................................................62
Changing or Deleting the Settings in Preview List........................................................................64
Changing the Settings in Preview List....................................................................................64
Deleting the Settings in Preview List......................................................................................64
Setting or Resetting the Reserve Attribute....................................................................................64
Setting the Reserve Attribute................................................................................................65
Resetting the Reserve Attribute.............................................................................................66
Setting Options......................................................................................................................67
Creating Pairs........................................................................................................................68
Creating L1 Pairs...............................................................................................................71
Creating L2 Pairs...............................................................................................................72
Splitting Pairs.........................................................................................................................74
Performing Only Pair Splitting..............................................................................................78
Performing Pair Creation and Pair Splitting............................................................................79
Performing At-Time Split Operation (Multiple Pair Splitting)......................................................80
Suspending Pairs....................................................................................................................82
Resynchronizing Pairs..............................................................................................................84
Deleting Pairs.........................................................................................................................88
Viewing Detailed Volume and Pair Information...........................................................................90
Viewing S-VOL Path Information................................................................................................92
Viewing the Number of Pairs and License Information..................................................................93
Viewing Pair Operation History................................................................................................95
7 Troubleshooting........................................................................................97
Troubleshooting......................................................................................................................97
Troubleshooting When Using RAID Manager.............................................................................98
Calling HP Technical Support.................................................................................................106
8 Support and Other Resources...................................................................108
Related Documentation..........................................................................................................108
Conventions for Storage Capacity Values.................................................................................108
HP Technical Support............................................................................................................108
Subscription Service..............................................................................................................109
4 Contents
HP Websites........................................................................................................................109
Documentation Feedback.......................................................................................................109
Glossary..................................................................................................110
Index.......................................................................................................112
Contents 5
1 Overview of HP StorageWorks XP Business Copy Software
This chapter provides an overview of HP StorageWorks XP Business Copy Software for HP
StorageWorks XP disk arrays. Topics include the following:
• “XP Business Copy” (page 6)
• “Business Benefits” (page 7)
• “Feature Highlights” (page 7)
Unless otherwise specified, the term storage system in this guide refers to the following disk arrays:
• HP StorageWorks XP24000 Disk Array
• HP StorageWorks XP20000 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.
XP Business Copy
HP provides innovative, storage-based technology solutions for enabling continuous business
operations. By partnering with customers to understand key business challenges and requirements,
HP is able to deliver robust, application-focused storage solutions that enhance operational efficiency
and resilience.
An essential component of business continuity and risk mitigation strategies and optimized IT
operations is the ability to replicate data quickly for critical application processing, testing and
development of new applications, zero-downtime recovery, data migration, and necessary backup
operations. The high-speed nondisruptive local mirroring technology of XP Business Copy In-System
Replication software rapidly creates multiple copies of mission-critical information within storage
systems in open-systems environments. XP Business Copy keeps data RAID-protected and fully
recoverable without affecting service or performance levels. Replicated data volumes can be split
from the host applications and used for system backups, application testing, and data mining
applications while business continues to run at full capacity.
XP Business Copy provides heterogeneous replication between any storage systems within a
virtualized storage pool managed by the storage system. Data that resides on an externally attached
storage system can be moved from the source to a target data volume anywhere in the storage
pool, including to another externally attached system. Using XP Business Copy, you can migrate
data volumes from one platform to another through the storage system and maximize the use of
your storage infrastructure. By providing nondisruptive, high-speed data replication within any
storage system or within the virtualized storage pool, XP Business Copy software enables immediate
use of data in decision support, software testing and development, and data protection operations.
This document describes and provides instructions for performing XP Business Copy operations on
the storage system using the XP Business Copy software on HP StorageWorks Remote Web Console.
The licensed XP Business Copy software displays the XP Business Copy information and allows
you to perform XP Business Copy operations. For further information on Remote Web Console,
see the HP StorageWorks XP24000/XP20000 Remote Web Console User Guide.
XP Business Copy operations can also be performed from the open-systems host using the RAID
Manager software. For information and instructions on using RAID Manager to perform XP Business
Copy operations, see the HP StorageWorks RAID Manager User Guide.
If you use the HP StorageWorks DKA Encryption License Key, you can create an XP Business Copy
pair by using an encrypted volume and a non-encrypted volume. For example, you can create the
pair specifying an encrypted volume as the P-VOL and a non-encrypted volume as the S-VOL. In
this case, data in the encrypted P-VOL will be copied as non-encrypted data in the non-encrypted
S-VOL.
6 Overview of HP StorageWorks XP Business Copy Software
Business Benefits
Ensure Business Continuity
• Shortens restart and recovery times with the consistency-group function, which provides
multivolume, point-in-time copies for applications and databases that share or span multiple
volumes
• Reduces recovery from data corruption time dramatically through the Business Copy
QuickRestore feature, which allows an immediate restore to a disk-resident, point-in-time data
copy
• Replicates large data volumes without having an impact on service levels, timing out, or
affecting performance levels
Improve Productivity and Processes
• Reduces testing and deployment time and increases the accuracy of application development
by providing always-available copies of current production data
• Increases competitive advantage through the Business Copy QuickSplit function by facilitating
the sharing of and immediate access to time-critical information for decision support, populating
data warehouses, performing analysis, or other data-mining operations
• Enables normal backup operations on a copy of up-to-date production data while critical
applications continue to run unaffected
• Simplifies data migration between storage systems
• Reduces operational and capital costs
• Allows business to remain online during data center activities, eliminating the need for 24/7
resources to perform these tasks
• Maximizes the storage infrastructure by leveraging the virtualization capabilities of the XP
Disk Array
• Allows the use of cost-effective storage for enhanced data protection purposes
Feature Highlights
Consistency Groups. For storage systems, the XP Business Copy software consistency-group function
allows a user-defined group of XP Business Copy volume pairs to be split simultaneously, with a
single command. This copy method creates a consistent point-in-time copy of an entire system,
database, or any related sets of volumes—a technique that can replicate data between a primary
system and secondary systems anywhere in the world, with full data integrity.
Business Benefits 7
2 About XP Business Copy Operations
This chapter describes XP Business Copy operations.
• “XP Business Copy Components” (page 8)
• “XP Business Copy Operations” (page 9)
• “Pair Status” (page 20)
• “XP Business Copy Options” (page 23)
XP Business Copy Components
A system using XP Business Copy usually contains the following components.
• Pair of volumes (P-VOL and S-VOL)
• Licensed XP Business Copy program product
Figure 1 (page 8) shows a typical XP Business Copy configuration using Remote Web Console.
Figure 1 XP Business Copy Components
8 About XP Business Copy Operations
You operate XP Business Copy from the Remote Web Console computer, and copy volumes in the
storage system. A volume that has original data is called a P-VOL, and a volume to which the data
is copied is called an S-VOL. A pair of the P-VOL and the S-VOL made by XP Business Copy is
called an XP Business Copy pair.
You may operate XP Business Copy directly from the host if you use RAID Manager. For details,
see “RAID Manager” (page 9).
Volume Pairs and Consistency Groups
XP Business Copy performs internal copy operations for logical volume pairs established by the
user. Therefore, XP Business Copy needs at least two volumes, one for the copy source (P-VOL)
and the other for the copy target (S-VOL). Each P-VOL can have up to three S-VOLs that are located
on the same storage system.
The XP Business Copy P-VOLs are the primary volumes that contain the original data. The XP
Business Copy S-VOLs are the secondary volumes that contain the backup data. Each S-VOL must
be paired with only one P-VOL. During XP Business Copy operations, the P-VOLs remain available
to all hosts for read and write I/O online operations (except during reverse copy and quick restore
operations). When the pair status is PAIR and if the P-VOL is updated, the differential data between
P-VOL and S-VOL will be copied to the S-VOL regularly. However, since XP Business Copy S-VOLs
are updated asynchronously, the P-VOL and S-VOL of the pair in PAIR status may not be identical.
Remember that the S-VOLs become available for host access only after the pair has been split.
Using RAID Manager, you can define multiple XP Business Copy pairs as one consistency group.
If you have defined a consistency group, you can split all XP Business Copy pairs in the group by
using the At-Time Split function. For details about the At-Time Split function, see “Split Pair Operation”
(page 13).
XP Business Copy Software
You can operate XP Business Copy by using the Remote Web Console computer. Remote Web
Console is attached to the storage systems through the TCP/IP local-area network (LAN). Remote
Web Console communicates and exchanges data directly with the service processor (SVP) of the
attached storage systems. You can view the structure or status of the storage system, or issue
commands to the storage system.
License
You need to purchase the XP Business Copy license and make sure that there is enough licensed
capacity for the capacity of the pairs you are going to create.
P-VOLs, S-VOLs, and reserved volumes require XP Business Copy licenses for volume capacity and
management. Before purchasing a volume capacity license, determine how much volume capacity
you will need. The total volume capacity you need to use cannot exceed the maximum licensed
volume capacity you have purchased.
RAID Manager
To operate XP Business Copy without using Remote Web Console, you can use RAID Manager.
By using RAID Manager, you can issue the commands directly from the host and operate XP Business
Copy.
XP Business Copy Operations
This section describes the main operations of XP Business Copy.
Set Reserve Attribute Operation
The XP Business Copy set reserve attribute operation reserves a volume so that it can be used as
an XP Business Copy S-VOL. Reserved volumes can only be used as XP Business Copy S-VOLs. The
XP Business Copy Operations 9
storage system rejects all write operations to reserved volumes, except when the pair is in PSUS
or PSUS(SP) status. For details about pair status, see “XP Business Copy Pair Status” (page 22).
You can reserve up to 16,384 volumes in one storage system.
Create Pair Operation
To create an XP Business Copy pair, the P-VOL must be in SMPL status. You may set a reserve
attribute on the S-VOL before creating a pair. You can also create a pair with an unreserved SMPL
volume. For details about how to create XP Business Copy pairs, see “Creating Pairs” (page 68)
and “Performing Pair Creation and Pair Splitting” (page 79).
You can specify up to three S-VOLs for one XP Business Copy P-VOL and create three pairs. In
addition, the XP Business Copy cascade function allows you to create a second layer of up to two
S-VOLs for each S-VOL in the first layer. Pairs created between the first and second layer are called
cascaded pairs. Figure 2 (page 11) illustrates cascaded XP Business Copy pairs.
10 About XP Business Copy Operations
Figure 2 Cascade Pairs
The first cascade layer (L1) is the original XP Business Copy pair. In case of cascaded pairs, the
P-VOL of the L1 pair is called root volume, and the S-VOL is called node volume. The P-VOL of the
second cascade layer (L2) is the node volume of L1 pair, and the S-VOL of the L2 pair is called
leaf volume. As shown in Figure 2 (page 11), this layering scheme allows you to create up to nine
XP Business Copy Operations 11
copies (S-VOLs) of one XP Business Copy P-VOL. Figure 2 (page 11), MU# refers to the MU number,
which identifies each MU. For example, MU# = 1 under the S-VOL1 means that the MU number
of the P-VOL, that pairs with the S-VOL, is 1.
Combination of L1 and L2 pairs with the HP StorageWorks XP Continuous Access Software volumes
is allowed; however, node volumes and leaf volumes are both considered secondary volumes
(S-VOLs) by XP Continuous Access.
When you create a new volume pair, an initial copy starts and all the data in the P-VOL is copied
to the S-VOL. Figure 3 (page 12) shows the change of the status of a pair from the start to the end
of the initial copy operation.
Figure 3 Change of Pair Status When You Create a Pair
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.
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 operations start
and the differential data of the P-VOL is copied to the S-VOL. As write I/Os are performed on a
duplex P-VOL, the storage system stores the differential bitmap, and then performs update copy
operations periodically based on the amount of differential data present on the P-VOL, as well as
the elapsed time between update copy operations. Figure 4 (page 13) illustrates an update copy
operation in an XP Business Copy pair with only one S-VOL.
12 About XP Business Copy Operations
Figure 4 Update Copy Operation
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. Whether the P-VOL and the S-VOL have the same data
depends on the condition of the storage system. To make the P-VOL data and the S-VOL data equal,
split the pair and make the pair status PSUS.
• Update copy operations are not performed for pairs with the following status: COPY(PD),
COPY(SP), PSUS(SP), PSUS, COPY(RS), COPY(RS-R), and PSUE.
• Update copy operations do not occur every time a host issues a write I/O operation to the
P-VOL of an XP Business Copy pair. XP Business Copy update copy operations are performed
asynchronously according to the differential bitmap, which is stored in shared memory.
• If shared memory is lost (for example, during an offline micro exchange), the differential bitmap
is also lost. In this case, the storage system treats the entire volume as differential data. For
pairs with COPY(SP) or PSUS(SP) status, the storage system changes the status to PSUE due
to the loss of the differential bitmap. Note that if shared memory has been lost, extra time is
required for XP Business Copy operations, since the storage system needs to copy the entire
volume.
Split Pair Operation
The XP Business Copy split capability provides point-in-time backup of your data and also facilitates
real data testing by making the XP Business Copy copies (S-VOLs) available for host access.
The XP Business Copy pairsplit operation copies whole P-VOL data or differential data at that time
to the S-VOL to make the S-VOL identical to the P-VOL. If there are many host I/Os for the P-VOL,
it may take time to synchronize the P-VOL and the S-VOL. When the pairsplit operation is complete,
the pair status changes to PSUS. The pairsplit operations cannot be performed on the pair whose
status is PSUE, COPY(RS), or COPY(RS-R).
While the pair is split, the storage system establishes a differential bitmap for the split P-VOL and
S-VOL and records all updates to both volumes. The P-VOL remains fully accessible during the
pairsplit operation. Whether you can access the S-VOL depends on what split type is specified.
There are two kinds of split types: Quick Split and Steady Split. In addition to the split types, there
is At-Time Split, that allows you to split all the pairs in the consistency group. You can perform
XP Business Copy Operations 13
Quick Split and Steady Split in the Pairsplit dialog box. However, you need RAID Manager to
perform At-Time Split.
• Pairsplit by Quick Split:
When you specify Quick Split, the pair status changes to PSUS(SP). The S-VOL is available
immediately for read and write I/Os (even though it is still reserved). The entire P-VOL data
or differential data will be copied to the S-VOL in the background.
• Pairsplit by Steady Split:
When you specify Steady Split, the pair status changes to COPY(SP), and the whole P-VOL
data or differential data at that time will be copied to the S-VOL. When the Steady Split
operation is complete, you have full read/write access to the split S-VOL (even though it is
still reserved). To quickly complete the copy operation to access the S-VOL, make the P-VOL
offline before the operation.
• Pairsplit by At-Time Split:
Pairsplit operation by At-Time Split can be performed by using RAID Manager.
When the XP Business Copy At-Time Split function is enabled, data in all P-VOLs in the same
consistency group is created in the corresponding S-VOLs when the storage system receives
the pairsplit request from the host server. Figure 5 (page 14) shows an overview of the XP
Business Copy At-Time Split function.
Figure 5 Overview of At-Time Split Function
Consistency groups are defined by RAID Manager’s configuration definition file, which is
created by users. The XP Business Copy software on the Remote Web Console computer
displays consistency group information, however, you cannot perform the At-Time Split operation
by using Remote Web Console. Use RAID Manager from the host to perform the At-Time Split
14 About XP Business Copy Operations
operation. For further information on RAID Manager, see the HP StorageWorks XP RAID
Manager User Guide.
• Triggers for the change of pair status to PSUS
The performance in the state of PSUS(SP) or COPY(SP) is different depending on the value of
system option mode 459 (ON or OFF, OFF by default) and whether the S-VOL or the volume
in a pool that is associated with the S-VOL is an external volume or internal volume.
Table 1 Performance in PSUS(SP) or COPY(SP) vs. SOM 459 and S-VOL.
PSUS(SP) or COPY(SP)S-VOL*System option mode 459
*If the S-VOL is a Dynamic Provisioning volume, it is the volume associated with the S-VOL in the pool volumes.
Suspend Pair Operation
When you suspend copy operations (using the RAID Manager pairsplit-E command), the P-VOL
and S-VOL status become PSUE and SSUE, respectively, and every track on the P-VOL is marked
as differential data. Performing pairresync on a suspended pair is similar to making an initial copy
and is not as fast as performing pairresync on a split pair.
The storage system will automatically suspend an XP Business Copy pair when it cannot keep the
pair mirrored for any reason. When the storage system suspends a pair, sense information is
generated to notify the host. The storage system will automatically suspend a pair under the following
conditions:
• When the storage system detects an error condition related to an update copy operation.
• When the differential bitmap in shared memory is lost (for example, due to offline microcode
exchange). This applies to COPY(SP) and PSUS(SP) pairs only. For PAIR, PSUS, COPY(RS),
or COPY(RS-R) pairs, the pair is not suspended but the entire P-VOL (S-VOL for reverse or quick
restore pairresync) is marked as difference data.
Internal volumeOFF
External volume
Internal volumeON
External volume
The pair status changes to PSUS after
all the differential data are copied to
the cache in the storage system.
The pair status changes to PSUS after
all the differential data are copied to
the cache in the storage system, and
the destage in the external storage
system has completed.
Resynchronize Pair Operations
To change the status of the pairs from PSUS to PAIR or from PSUE to PAIR, you must resynchronize
the pairs. XP Business Copy allows you to perform four different types of pairresync operations:
forward pairresync (Normal Copy and Quick Resync) and reverse pairresync (Reverse Copy and
Quick Copy). Forward pairresync means copying P-VOL data to the S-VOL, and reverse pairresync
means copying S-VOL data to the P-VOL.
• Normal Copy (forward pairresync in normal speed)
The normal pairresync operation (see Figure 6 (page 17)) first reads the differential bitmap
of the P-VOL and S-VOL, and then resynchronizes the S-VOL with the P-VOL based on the
differential bitmap. The copy direction for a normal pairresync operation is P-VOL to S-VOL.
Pair status changes to PAIR when the copying process of differential data completes. The pair
XP Business Copy Operations 15
status during a normal pairresync operation is COPY(RS), and the P-VOL remains accessible
to all hosts for both read and write operations during a normal pairresync.
• Quick Resync (forward pairresync in fast speed)
The quick pairresync operation (see Figure 6 (page 17)) first reads the differential bitmap of
P-VOL and S-VOL, and changes the pair status to PAIR. The differential data based on the
differential bitmap will be copied when update copy operations are performed for the pair
in PAIR status. The pairresync operation by Quick Resync is faster than Normal Copy because
Quick Resync changes pair status to PAIR before actually copying differential data to the
S-VOL.
The pair status during a quick pairresync operation is COPY(RS). The P-VOL remains accessible
to all hosts for both read and write operations. The S-VOL becomes inaccessible to all hosts
during a quick pairresync operation.
Figure 6 (page 17) illustrates how the data changes during the forward pairresync operations.
16 About XP Business Copy Operations
Figure 6 Forward Pairresync Operations
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. Whether the P-VOL and the S-VOL have the same data
depends on the condition of the storage system. To make the P-VOL data and the S-VOL data equal,
split the pair and make the pair status PSUS.
• Reverse Copy (reverse pairresync in normal speed)
The reverse pairresync operation (see Figure 7 (page 19)) synchronizes the P-VOL with the
S-VOL. The copy direction for a reverse pairresync operation is S-VOL to P-VOL. The pair status
during a reverse copy operation is COPY(RS-R). The P-VOL and the S-VOL become inaccessible
to all hosts for write operations during a reverse pairresync operation. As soon as the reverse
pairresync is complete, the P-VOL becomes accessible.
The P-VOL remains read-enabled during the reverse pairresync operation only to enable the
volume to be recognized by the host. The data on the P-VOL is not guaranteed until the reverse
pairresync operation is complete and the status changes to PAIR.
• Quick Restore (reverse pairresync in fast speed)
The quick restore operation (see Figure 7 (page 19)) speeds up reverse copy by changing
the volume map in the storage system to swap the contents of the P-VOL and S-VOL without
copying the S-VOL data to the P-VOL. The P-VOL (used to be the S-VOL) and S-VOL (used to
XP Business Copy Operations 17
be the P-VOL) are resynchronized when update copy operations are performed for pairs in
the 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.
◦ After quick restore operation is executed, the Remote Web Console window may display
old configuration information on components such as logical volumes (LDEVs). The window
may display configurations before the quick restore operation is performed. To update
configuration information on Remote Web Console, wait until the quick restore operation
completes and then click File and then Refresh on the menu bar of the window.
◦ If the differential data between P-VOL and S-VOL is small, the reverse copy operation
may be completed faster than the quick restore operation.
◦ If you create a pair by using an encrypted volume and a non-encrypted volume and then
execute Quick Restore, the P-VOL encryption status and the S-VOL encryption status will
be reversed. For example, if you perform Quick Restore on an encrypted P-VOL and a
non-encrypted S-VOL, P-VOL will be a non-encrypted volume, and S-VOL will be an
encrypted volume.
Figure 7 (page 19) illustrates how the data changes during the reverse pairresync operations.
18 About XP Business Copy Operations
Figure 7 Backward Pairresync Operations
• The P-VOL remains read-enabled during the quick restore operation only to enable the volume
to be recognized by the host. The data on the P-VOL is not guaranteed until the quick restore
operation is complete and the status changes to PAIR.
• During reverse or quick restore pairresync, you cannot perform paircreate, pairsplit, or
pairresync for any other pair that shares the same P-VOL (pairsplit-S and pairsplit-E are allowed).
Pairresync operation time depends on the pair status, PSUS or PSUE. The relationship between the
pair status and the time required for pairresync operations are as follows:
• Pairresync for PSUS pair
When a normal/quick pairresync operation is performed on a split pair (status = PSUS), the
storage system copies all differential tracks from the P-VOL to the S-VOL. When a reverse or
quick restore pairresync operation is performed on a split pair, the storage system copies all
differential tracks from the S-VOL to the P-VOL. This ensures that the P-VOL and S-VOL are
XP Business Copy Operations 19
properly resynchronized in the desired direction, and also greatly reduces the time needed
to resynchronize the pair.
• Pairresync for PSUE pair
When a normal/quick pairresync operation is performed on a suspended pair (status = PSUE),
the storage system copies all data on the P-VOL to the S-VOL, since all P-VOL tracks were
regarded as difference data when the pair was suspended. The normal pairresync operation
for suspended pairs is equivalent to and takes as long as the XP Business Copy initial copy
operation. If you perform the quick pairresync operation on the suspended pairs, the update
copy operation will be performed, and all the data will be copied to the S-VOL. In this case,
the update copy operation will take much more time than the initial copy operation.
Delete Pair Operation
The XP Business Copy pairsplit-S operation (delete pair) stops the copy operations to the S-VOL of
the pair and changes the pair status of both volumes to SMPL. An XP Business Copy pair can be
deleted by the user at any time except during the quick pairsplit operation (that is, any status except
SMPL and PSUS(SP)).
When a delete pair operation is performed on a pair in PSUS status, the reserve attribute of the
S-VOL is reset automatically.
The S-VOL of a duplex pair (PAIR status) may not be identical to its P-VOL, because of the
asynchronous XP Business Copy update copy operations. See “Deleting Pairs” (page 88) for
instructions on synchronizing the volumes before deleting the pair.
CAUTION:
• If you delete a pair, the volume status changes from SMPL(PD) to SMPL. You can check the
• After an XP Business Copy pair is deleted, to execute a command to perform tasks such as
Pair Status
Figure 8 (page 21) illustrates the XP Business Copy pair status transitions and the relationship
between the pair status and the XP Business Copy operations.
volume status in the Pair Operation window.
Although you can check the volume status by using the Pairdisplay command of RAID Manager,
this command does not enable you to distinguish between SMPL and SMPL(PD). To distinguish
between SMPL and SMPL(PD), perform the inqraid command. Check whether or not the volume
is used by XP Business Copy. If the volume is used by XP Business Copy, the volume status is
SMPL(PD). If the volume is not used by XP Business Copy, the volume status is SMPL.
pair operation or event waiting, wait at least 10 seconds, until the volume status changes from
SMPL(PD) to SMPL. If you do not wait, the command might end abnormally.
20 About XP Business Copy Operations
Figure 8 XP Business Copy Pair Status Transitions
1. If a volume is not assigned to an XP Business Copy pair, the volume's status is SMPL.
2. Select the SMPL volumes for P-VOL and S-VOL to create an XP Business Copy pair. When you
create an XP Business Copy 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. When the initial
copy is completed, the differential data between the P-VOL and the S-VOL will be copied by
the update copy.
4. There are two kinds of pair status (PSUS and PSUE) when the pair is not synchronized.
• When you split a pair (pairsplit), the pair status changes to PSUS.
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
Pair Status 21
operation is complete, the pair status changes to PSUS to enable you to access the split
S-VOL. The update copy operation is not performed on the pairs that have status PSUS.
• If the storage system cannot maintain PAIR status for any reason, or if you suspend the
pair (pairsplit-E), the pair status changes to PSUE.
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.
• When you specify Reverse Copy or Quick Restore mode for a pairresync operation, the
pair status changes to COPY(RS-R).
• When you delete a pair (pairsplit-S), the status of the volumes that were used by the pair
changes to SMPL. You cannot delete the pair that has status PSUS(SP).
• When you specify Reverse Copy or Quick Restore mode for a pairresync operation, the
pair status changes to COPY(RS-R).
• When you delete a pair (pairsplit-S), the status of the volumes that were used by the pair
changes to SMPL. You cannot delete the pair that has status PSUS(SP).
Table 2 (page 22) lists and describes the XP Business Copy pair status conditions.
Table 2 XP Business Copy Pair Status
S-VOL AccessDescriptionPair Status
SMPL
COPY(PD)
PAIR
COPY(SP)
PSUS(SP)
The storage system accepts read and write I/Os for all
SMPL volumes that are not reserved.
initial copy will be performed.1The storage system
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.
system starts performing 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.
accepted normally. The split operation triggers a copy
operation.1All P-VOL updates prior to the pairsplit
command are being copied to the S-VOL. When these
updates are complete, the split S-VOL is identical to the
state of the P-VOL when the split started.
The pairsplit operation in the quick split mode has been
accepted normally. The split operation triggers a copy
operation.1Only the P-VOL differential data is being copied
to the S-VOL in background. The PSUS(SP) pairs cannot
be deleted.
N/A (there is no S-VOL yet).The volume is not assigned to an XP Business Copy pair.
Read only.The paircreate operation has been accepted normally. The
Read only.The initial copy operation is complete, and the storage
Read only.The pairsplit operation in the steady split mode has been
Read and write. The S-VOL can be
mounted.
PSUS
22 About XP Business Copy Operations
The storage system stops performing update copy
operations for PSUS (split) pairs, and starts accepting write
I/Os for PSUS S-VOLs. The storage system keeps track of
all updates to the split P-VOL and S-VOL, so that the pair
can be resynchronized quickly.
Read and write. The S-VOL can be
mounted.
Table 2 XP Business Copy Pair Status (continued)
S-VOL AccessDescriptionPair Status
COPY(RS)
pairresync operation triggers a copy operation.1When a
split pair is resynchronized in normal mode, the storage
system copies only the P-VOL differential data to the S-VOL.
When a PSUE (suspended) pair is resynchronized, the
storage system copies the entire P-VOL to the S-VOL. No
update copy operations are performed during the
pairresync operation.
COPY(RS-R)
normally. The reverse pairresync operation triggers a copy
operation.1When a split pair is resynchronized in reverse
or quick restore mode, the storage system 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.
PSUE
I/Os for a PSUE (suspended) P-VOL, but does not perform
update copy operations to a PSUE S-VOL. The storage
system marks the entire P-VOL track map as difference data
so that the entire P-VOL is copied to the S-VOL when the
PSUE pair is resumed. Use the pairresync command to
resume a PSUE pair.
1 It may take time until the copy starts, because the starting time of the copy depends on the number of pairs and the
system environment.
Read only.The pairresync operation has been accepted normally. The
Read only.The reverse pairresync operation has been accepted
Read only.The storage system continues accepting read and write
XP Business Copy Options
You can use the options shown in Table 3 (page 23) for XP Business Copy operations.
Table 3 Types of XP Business Copy Options
Swap&Freeze
Host I/O
Performance
Copy Threshold
Available option types depend on the storage system settings.
Swap&Freeze Option
The Swap&Freeze option allows the S-VOLs of an XP Business Copy pair to remain unchanged
after the quick restore operation. If the quick restore operation is performed on an XP Business
Copy pair with the Swap&Freeze option, update copy operations are suppressed and not performed
for pairs in the 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 the PAIR status.
Make sure that the Swap&Freeze option remains in effect until the pair status changes to PAIR after
the quick restore operation.
Swap&Freeze option suppresses the update copy. For
details, see “Swap&Freeze Option” (page 23).
operations by XP Business Copy. For details, see “Host
I/O Performance Option” (page 24).
of XP Business Copy. For details, see “Copy Threshold
Option” (page 24).
RequirementFeaturesOption Type
You must change the storage system
setting to allow the quick restore
operation.
-Host I/O Performance option suppresses the copy
-Copy Threshold option temporarily stops the copy operation
XP Business Copy Options 23
Figure 9 (page 24) shows the state of the S-VOL after the quick restore operation with or without
the Swap&Freeze option.
Figure 9 Quick Restore Operation With or Without Swap&Freeze Option
The Quick Restore pairresync operation on a pair with status PSUS exchanges the data in the
P-VOL and the S-VOL of the pair. If you use 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, the data of the P-VOL and the S-VOL is kept exchanged.
If you do not use 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 the data in the P-VOL overwrites the S-VOL.
Host I/O Performance Option
The Host I/O Performance option improves host I/O responses over XP Business Copy copying
processing time. When the Host I/O Performance option is used, the storage system suppresses
the execution of XP Business Copy copying processing, and consequently the host I/O responses
improve.
When XP Business Copy copy processing is suppressed by the Host I/O Performance option, the
time taken for copying increases. Also, if XP Business Copy™ for Mainframe pairs exist, host I/O
responses might not be faster. In this case, set the Host I/O Performance option for ShadowImage
for Mainframe as well.
Copy Threshold Option
If the load of the storage system increases, the host server I/O performance (response) may be
degraded. If XP Business Copy performs copy operations when the load of the storage system is
heavy, it is more likely that host server I/O performance (response) may be degraded. The Copy
Threshold option temporarily stops the copy operations when the load of the storage system is
heavy. If you set this option, you can minimize the degradation of host I/O performance by
temporarily stopping XP Business Copy copy operations when the storage system load is heavy.
XP Business Copy has another option called the Host I/O Performance option, which maintains
host I/O performance (response). The Host I/O Performance option suppresses the copy operations
regardless of the status of the storage system. However, the Copy Threshold option is effective only
24 About XP Business Copy Operations
when the storage system load is heavy. When the Copy Threshold option is in effect, all the XP
Business Copy copy operations stop.
For information about setting the Host I/O Performance option, see “Host I/O Performance Option”
(page 24). For information about setting the Copy Threshold option, call HP technical support.
Copy operations that are stopped by the Copy Threshold option will resume when the load of the
storage system becomes light. If this option is valid, the copy operation and the copy operations
of the following program products will stop when the load of the storage system is heavy:
• ShadowImage for Mainframe
• HP StorageWorks XP for FlashCopy Mirroring Software
• HP StorageWorks XP for FlashCopy Mirroring V2 Software
• HP StorageWorks XP Snapshot Software
• HP StorageWorks XP Auto LUN Software
XP Business Copy Options 25
3 Interoperability with Other Products and Functions
XP Business Copy supports concurrent operations with the following data management functions:
• “Open Volume Management” (page 26)
• “Cache Residency Manager” (page 26)
• “LUN Manager” (page 26)
• “Data Retention Utility” (page 26)
• “XP Auto LUN” (page 27)
• “HP StorageWorks XP External Storage Software” (page 28)
• “XP Continuous Access” (page 28)
• “XP Continuous Access Journal” (page 31)
• “XP Continuous Access and XP Continuous Access Journal” (page 34)
• “HP StorageWorks XP Thin Provisioning Software” (page 37)
• “VERITAS NetBackup DataCenter” (page 39)
Open Volume Management
Virtual LUN volumes can be assigned to XP Business Copy pairs, provided that the S-VOL has the
same capacity as the P-VOL. If you need to perform Open Volume Management operations on an
existing XP Business Copy P-VOL or S-VOL, you must delete the pair first to return the volume to
SMPL status.
LUSE volumes can be assigned to XP Business Copy pairs, provided that the P-VOL and S-VOL
have the same LU type and the same number of LDEVs (same size). If you need to perform LUSE
operations on an existing XP Business Copy P-VOL or S-VOL, you must delete the pair first to return
the volume to SMPL status.
Cache Residency Manager
Volumes that have Cache Residency Manager settings can be assigned to XP Business Copy pairs,
and Cache Residency Manager operations can be performed on XP Business Copy P-VOLs and
S-VOLs.
IMPORTANT: See “Performance Considerations” (page 48) for important information about
performing quick restore operations on volumes that have Cache Residency Manager settings.
LUN Manager
LUN Security operations do not affect XP Business Copy operations. Volumes that are under secure
ports and/or that are assigned to WWN groups and/or LUN groups can also be assigned to XP
Business Copy pairs. Volumes that are assigned to XP Business Copy pairs can also be assigned
to secure ports, WWN groups, and/or LUN groups for LUN Security.
XP Business Copy S-VOLs cannot be accessed by any host except when the pair is split.
Data Retention Utility
XP Business Copy can create pairs using volumes to which access attribute is set by Data Retention
Utility. However, you cannot create an XP Business Copy pair specifying the volume with S-VOL
Disable attribute as an S-VOL.
26 Interoperability with Other Products and Functions
Table 4 (page 27) describes whether you can or cannot specify the volume with access attribute
as a P-VOL or S-VOL of an XP Business Copy pair.
Table 4 Access Attribute and Availability as a Volume of XP Business Copy Pair
Availability as a Volume of XP Business Copy PairAccess Attribute
S-VOLP-VOL
YesYesRead/Write
YesYesRead Only (Volume)
YesYesProtect
NoYesS-VOL Disable
Table 5 (page 27) describes whether you can or cannot perform the XP Business Copy operations
to the volume with S-VOL Disable attribute.
Table 5 Availability of XP Business Copy Operations to the Volume with S-VOL Disable Attribute
Availability of XP Business Copy OperationsXP Business Copy Operations
S-VOLP-VOL
NoYesPaircreate
NoYesPairsplit
1
NoYesPaircreate and Pairsplit
1 Paircreate and Pairsplit means that you simultaneously create and split XP Business Copy pairs (see “Performing Pair
Creation and Pair Splitting” (page 79)).
XP Auto LUN
The following XP Business Copy volumes can be assigned to migration volumes of XP Auto LUN:
• Root volumes that are paired with two or fewer node volumes
• Node volumes that are paired with one leaf volumes
• Node volumes that are not paired with any leaf volumes
• Reserved volumes
To:
• Assign the XP Business Copy volumes to migration volumes, or
• Reserve the XP Business Copy volumes as the migration volumes, or
• Assign the XP Business Copy volumes that do not meet the above mentioned conditions,
NoYesForward Pairresync
NoNoBackward Pairresync
NoYesSuspend
YesYesDelete
You must delete the XP Business Copy volumes or unreserve XP Business Copy volumes before
using the volumes by XP Auto LUN.
If you assign XP Business Copy volumes that do not meet the condition to the migration volumes,
or if you assign XP Business Copy volumes to XP Auto LUN volumes other than migration volumes,
the command will be rejected. Also, if you split the XP Business Copy pair that is assigned to the
XP Auto LUN migration volumes, migration of those volumes will be canceled.
XP Auto LUN 27
You cannot use migration volumes, destination volumes, or reserved volumes of XP Auto LUN for
XP Business Copy pair operations (the command will be rejected). To use XP Auto LUN volumes
for XP Business Copy pair operations, you must release the volumes by using XP Auto LUN.
HP StorageWorks XP External Storage Software
XP Business Copy operations can also be performed in conjunction with XP External Storage
operations to create pairs with the external volumes. For information about the external volumes,
see the HP StorageWorks XP24000/XP20000 External Storage Software User Guide.
XP Continuous Access
XP Continuous Access volumes can be assigned to XP Business Copy pairs and vice versa.
XP Business Copy and XP Continuous Access can function together in the same storage system to
provide both internal and remote backup for your important data.
CAUTION: When performing the Quick Restore pairresync operation on the XP Business Copy
pair that shares the volume with HP StorageWorks XP Continuous Access Asynchronous Software,
XP Business Copy P-VOL and S-VOL must be allocated to the same CLPR. Specify the Reverse Copy
mode instead of the Quick Restore mode when resynchronizing the XP Business Copy pair whose
P-VOL and S-VOL are allocated to the different CLPR.
• XP Business Copy is recommended for intra-storage system copy operations. If XP Business
Copy is not installed, XP Continuous Access (synchronous only) can be used to copy within
the same storage system. This XP Continuous Access configuration requires at least one external
ESCON cable loop (minimum of two is recommended).
• Combination of XP Business Copy L1 and L2 pairs with XP Continuous Access volumes is
allowed. Node volumes and leaf volumes are both considered S-VOLs by XP Continuous
Access.
The configuration shown in Figure 10 (page 28) is an example of a volume that is functioning as
both an XP Continuous Access P-VOL and an XP Business Copy P-VOL. This configuration allows:
• On-site backup copies of XP Continuous Access P-VOLs
• Remote backup copies of XP Business Copy P-VOLs
Figure 10 Shared Volume of XP Business Copy and XP Continuous Access: P-VOL
28 Interoperability with Other Products and Functions
Figure 11 (page 29) illustrates a volume that is functioning as both an XP Continuous Access S-VOL
and an XP Business Copy P-VOL, which allows you to use XP Business Copy to provide remote
copies of XP Continuous Access S-VOLs.
Figure 11 Shared Volume of XP Business Copy and XP Continuous Access: P-VOL/S-VOL
CAUTION: When you use an XP Business Copy P-VOL with an XP Continuous Access S-VOL as
shown in Figure 11 (page 29), the write operation to the XP Continuous Access P-VOL takes extra
time. Especially, when the XP Business Copy pair is in the PSUS(SP) status, the write operation to
the XP Continuous Access P-VOL may take time according to the time for copying process of the
XP Business Copy pair.
In addition, in the case of HP StorageWorks XP Continuous Access Journal Software, the XP
Continuous Access pair may be suspended by failure because of the shortage of the capacity of
its journal volume.
When you split XP Business Copy pairs, if a volume is shared with XP Continuous Access
asynchronous and XP Business Copy, consider the following points:
• Split the XP Business Copy pair, after you have changed the status of the XP Continuous Access
asynchronous pair to PSUS or PSUE.
• If you split the XP Business Copy pairs for each consistency group, split the pairs after you
change the status of all XP Continuous Access asynchronous pairs in the specified consistency
group to PSUS or PSUE, and also made the consistency time (C/T) of the consistency group
equal to the C/T of each XP Continuous Access asynchronous pair.
You can also prevent the XP Business Copy pairsplit operation, which is under the condition
described above. For details, call technical support.
The configuration shown in Figure 12 (page 30) illustrates a volume that is functioning as both an
XP Continuous Access P-VOL and an XP Business Copy P-VOL, while the S-VOL of the same XP
Continuous Access pair is also functioning as the P-VOL of another XP Business Copy pair. This
configuration allows:
• On-site backup copies of XP Continuous Access P-VOLs and S-VOLs
• Remote backup of XP Business Copy P-VOLs
XP Continuous Access 29
Figure 12 Shared Volumes of XP Business Copy and XP Continuous Access: P-VOL/P-VOL and
P-VOL/S-VOL
Figure 13 (page 30) illustrates a volume functioning as both an XP Business Copy S-VOL and an
XP Continuous Access P-VOL, which allows you to use XP Continuous Access to provide
asynchronous remote copy.
Figure 13 Shared Volume of XP Business Copy and XP Continuous Access: S-VOL/P-VOL
• This configuration does not allow XP Business Copy and XP Continuous Access to copy at the
same time. Create the XP Business Copy pair first, and then split the pair before creating the
XP Continuous Access pair. You must suspend the XP Continuous Access pair to resynchronize
the XP Business Copy pair. The XP Continuous Access pair status cannot be changed when
the XP Business Copy pair is in the PSUS(SP) status.
• Usually, XP Continuous Access and XP Continuous Access Journal can share the volumes with
XP Business Copy. However, in some cases, you cannot create XP Business Copy pairs using
the volume shared with XP Continuous Access and XP Continuous Access Journal. “XP Business
Copy, XP Continuous Access Journal, and XP Continuous Access: Combination that is Allowed
(Example 1)” (page 35) and “XP Business Copy, XP Continuous Access, and XP Continuous
Access Journal: Combination That Is Allowed (Example 2)” (page 35) show that you cannot
30 Interoperability with Other Products and Functions
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