HP StoreVirtual 4000 9.0 HP StorageWorks P4000 Remote Copy User Guide
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- HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 1
Remote Copy user guide Abstract This guide provides information about configuring and using asynchronous replication of storage volumes and snapshots across geographic distances. For the latest version of this guide, see the HP website http://www.hp.com/support/manuals. Part Number: AX696-96032 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 2
L.P. Confidential computer software. Valid license from HP required for possession, use or copying. 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 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 3
26 Viewing the status in the Remote Snapshot Details window 26 Scheduling remote snapshots ...29 Best practices for scheduling remote snapshots 29 P4000 Remote Copy user guide 3 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 4
the Volume Failover/Failback Wizard 34 Converting a primary volume to a remote volume 34 Using failover to remote volume 35 Resuming production after failover 36 Synchronizing data after failover 36 Example scenario ...36 Returning operations to original primary site 36 Synchronizing the data - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 5
service ...59 HP Insight Remote Support Software 59 New and changed information in this edition 60 Related information ...60 HP websites ...60 Typographic conventions ...60 Customer self repair ...61 HP product documentation survey 62 Glossary 63 Index 71 P4000 Remote Copy user guide - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 6
Figures 1 Basic flow of Remote Copy 9 2 Icons depicting the primary snapshot copying to the remote snapshot 10 3 Icons for Remote Copy in the Graphical Legend window 11 4 Remote copy in progress 19 5 Calculating a custom value for setting remote bandwidth 24 6 Viewing remote snapshot details - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 7
3 Snapshot retention policy and maximum number of retained snapshots 14 4 Scheduled Remote Copy planning checklist 15 5 Fields for Remote Snapshot Details window 27 6 Timeline of failover 36 7 Creating snapshots of data to synchronize 37 8 Document conventions 60 P4000 Remote Copy user guide 7 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 8
8 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 9
basic flow of Remote Copy. Reproducing data using Remote Copy follows a three-step process: 1. At the production location, create a snapshot of the primary volume. This is called the primary snapshot. 2. Create a remote snapshot. Figure 1 Basic flow of Remote Copy . P4000 Remote Copy user guide 9 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 10
Copy can be used on the same site, even in the same management group and cluster. Graphical representations of Remote Copy The HP StorageWorks P4000 Centralized Management Console displays special graphical representations of Remote Copy. Copying the primary snapshot to the remote snapshot When the - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 11
data. Using synchronous Network RAID on multiple storage systems within a cluster in combination with asynchronous Remote Copy on a different cluster of storage systems creates a robust, high-availability original volume for use by other application servers. P4000 Remote Copy user guide 11 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 12
Remote Copy works at the management group, cluster, volume, and snapshot levels. Review Table 2 on page 12 for common configurations at these levels. Table 2 Remote Copy, SAN/iQ, and storage systems Storage system level Remote Copy configuration Management groups • Create remote snapshots in the - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 13
Planning the Remote Copy schedule Planning is critical. The following issues impact the amount of storage available in the system: • Recurrence • Capacity • Retention Recurrence How often do you copy to finish. 3. Create another remote snapshot of the primary volume. P4000 Remote Copy user guide 13 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 14
for the primary and remote snapshots. For example, you can choose to retain two primary snapshots and five remote snapshots. The number of snapshots retained refers to completed snapshots. Take the following characteristics of scheduled remote snapshots into account when planning retention policies - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 15
remote snapshot retention policy Maximum number of snapshots retained n of only incremental copying is required for remote snapshots. • Review your remote copy schedule to ensure that the frequency Select one of the following options: • Maximum number of snapshots (#) • Set period of time (minutes - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 16
take additional space on the cluster while copying. Also, the system will not delete the last fully synchronized snapshot. For space calculations, figure n+2 where n=maximum number of snapshots. • Set period of time (minutes, hours, days or weeks) 16 Understanding and planning Remote Copy - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 17
group. • Log in to the remote management group. • Create a primary snapshot of the primary volume manually. When setting up a schedule to create a remote snapshot of a volume, the software automatically creates a Snapshot window where remote copy procedures start. P4000 Remote Copy user guide 17 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 18
snapshot, select the Application-Managed Snapshot check box. This option requires the use of the VSS Provider. For more information, see the HP StorageWorks P4000 SAN Solution user guide or online help. If the VSS Provider is not installed, use SAN/iQ to create a point-in-time snapshot (not using - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 19
application (volume set). For example, you may set up Exchange to use two volumes to support a StorageGroup: one for mailbox data and one for logs. Those two volumes make a for application-managed snapshots, see the HP StorageWorks P4000 SAN Solution user guide or online help. P4000 Remote Copy - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 20
. This option requires the use of the VSS Provider. For information about the requirements for application-managed snapshots, see the HP StorageWorks P4000 SAN Solution user guide or online help. This option quiesces VSS-aware applications on the server before SAN/iQ creates the snapshot. The system - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 21
volume. • Create a new remote volume manually. • Create a new remote volume during creation of a remote snapshot. • Use the Management Groups, Clusters, and Volumes wizard in the "Getting Started" launch pad. See the HP StorageWorks P4000 SAN Solution user guide for details on working through the - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 22
help, see the "Getting Started" chapter in the HP StorageWorks P4000 SAN Solution user guide for details on working through the wizards. The wizard the data directly over the WAN using Remote Copy. Use the storage systems intended for the remote site to configure the remote management group onsite - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 23
management group over gigabit Ethernet. See "Creating a remote snapshot" on page 17. 3. Ship the storage systems to the remote Site B. 4. Power them on and discover them in the CMC to Remote Copy PrimeSync - Creating Initial Copy" at http://www.hp.com/support/manuals. P4000 Remote Copy user guide 23 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 24
Viewing a list of remote snapshots View a list of remote snapshots associated with management groups, clusters, volumes, or snapshots. 1. In the navigation window, select a cluster to view its list of remote snapshots. 2. Click the Remote Snapshot. The report in the Remote Snapshot tab lists - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 25
select a snapshot, click the Details tab, and then view the Snapshot Set field. For information about snapshot sets, see the HP StorageWorks P4000 SAN Solution user guide or online help. HP recommends that you keep or delete all snapshots for a volume set. If you need to roll back to a snapshot, you - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 26
can also receive event notification through email and SNMP traps. For information about configuring event notification, see the HP StorageWorks P4000 SAN Solution user guide. Monitoring details from the Remote Snapshots feature You can view information about each remote snapshot in both the Remote - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 27
Remote Snapshot Original Mgmt Group Original Snapshot Status Manual | Scheduled Snapshot Scanned (%) State Time Fields The was created. This is used with PrimeSync feature. Whether the snapshot was created manually or with a scheduled snapshot The percentage complete of the copy process. Values are - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 28
. The field format is MM/DD/YYYY HH:MM:SS [AM/PM] The number of days, hours, minutes, and seconds since the copy began processing. The field Xs X. N/A signifies completed copies or in-progress copies not yet calculated. The number of days, hours, minutes, and seconds estimated to remain in the copy - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 29
volume manually, • If you are performing daily remote copies, schedule • Use NTP to set all storage systems in the management group to for the primary snapshot, either number of days or number of snapshots. You can retain up snapshots" in the HP StorageWorks P4000 SAN Solution user guide. If the VSS - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 30
set). For example, you may set up Exchange to use two volumes to support a StorageGroup: one for mailbox data and one for logs. Those two volumes the requirements for application-managed snapshots, see the HP StorageWorks P4000 SAN Solution user guide or online help. When you first create the - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 31
either number of days or number of -managed snapshots" in the HP StorageWorks P4000 SAN Solution user guide. If the VSS Provider all volumes in the volume set. 13. Review the information about the volume set and the window is the time zone of the storage system through which you first logged in - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 32
What the system does If you created a new volume for the remote volume, the system creates a new primary snapshot of the primary volume and a remote snapshot of the remote volume. See "Best practices for scheduling remote snapshots" on page 29. If you selected an existing volume to become the remote - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 33
are the current volumes in the volume set. For more information, see "Understanding schedules to snapshot volume sets" in the HP StorageWorks P4000 SAN Solution user guide. 1. In the navigation window, select the primary volume that has the schedule you want to edit. 2. Click the Schedules tab - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 34
review the Snapshot Set field. For more information about volume sets and snapshot sets, see the HP StorageWorks P4000 SAN Solution user guide User Manual and the sample scripts available at http:// www.hp.com and the recovered, or newly configured, production site primary volume. NOTE: When - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 35
choice if your primary volume is not available and you want to get an acting primary volume into production. 5. Select To failover to the remote volume, and click Next. The next window reminds you to of the actions and a reminder to reconnect your iSCSI sessions. P4000 Remote Copy user guide 35 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 36
the resulting volume's attributes. For more information, see the HP StorageWorks P4000 SAN Solution user guide or online help. Resuming production after failover After failover occurs, three scenarios exist for resuming production: • Failback returns operations to the original primary site it - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 37
snapshot back to the original primary volume. Creating a new primary volume at the original production site If the original primary volume is not available, designate a new primary volume, synchronize for the scheduled remote snapshots on the new primary volume. P4000 Remote Copy user guide 37 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 38
at the original production site. Making the backup site into the new production site Turn the backup site into the new production site and designate about volume sets and snapshot sets, see the HP StorageWorks P4000 SAN Solution user guide or online help. Prerequisites Stop applications from - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 39
that you want to roll back to. 3. Review the snapshot Details tab to ensure you have selected the you convert the remote volume into a primary volume and then perform the steps in Rolling back a primary volume. If a HP StorageWorks P4000 SAN Solution user guide or online help. P4000 Remote Copy - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 40
knowledge between those groups. Best practice for disassociating management groups NOTE: Do this only if a group no longer exists, or if instructed by Customer Support. 1. Log in to both management groups that you want to disassociate. 2. In the navigation window, select the remote management group - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 41
1. Click OK. The Edit Management Group window is displayed on top again, and the remote management group you disassociated from is gone from the list. 2. Click OK to return to the navigation window. P4000 Remote Copy user guide 41 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 42
42 Using Remote Copy - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 43
availability configuration. • Configure primary and backup application servers. During normal operation, the production application server reads and writes to the primary volume. • Set up a schedule for VSS to quiesce the application before creating remote snapshots. P4000 Remote Copy user guide 43 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 44
the backup application server. The remote volume and remote snapshots become acting primary, and the backup application server becomes the acting production application server, accessing data from the acting primary volume. Figure 11 High availability configuration during failover . 44 Sample Remote - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 45
last remote snapshot was created is unavailable until the volume or production application server is restored. Failover to the backup application server CLIQ-The SAN/iQ Command-Line Interface User Manual and the sample scripts available at http://www.hp.com/go/P4000downloads. 3. Because the backup - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 46
Figure 10 on page 44 uses three storage systems per cluster. However, this scenario can use any number of storage systems. For information about creating clusters and volumes, see the HP StorageWorks P4000 SAN Solution user guide. • In the production location, create a management group and a cluster - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 47
primary volumes, and ensures that you have copies of your data in the remote site on storage systems as well as on tape. Configuration for affordable disaster recovery To configure affordable disaster recovery site locations to be the destination for remote snapshots. P4000 Remote Copy user guide 47 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 48
configuration for disaster recovery. Figure 14 Affordable disaster recovery example configuration . How this works for affordable disaster recovery If the storage systems in your primary location fail or volumes become unavailable, the off-site location contains the most recent remote snapshots - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 49
access it more efficiently. Figure 15 Restoring from a remote volume . In Figure 15 on page 49 note the volume labeled Primary Snapshot in the Production Site. It originated as a read only backup, but is brought into use as an acting primary. Figure 16 Restoring from tape backup . P4000 Remote - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 50
creating remote snapshots accordingly. If you do not want a large number of remote snapshots to accumulate on your remote volume, you can use your remote volume against storage system failure. Example configuration • In the production location, create a cluster of three storage systems, all with - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 51
data directly from recent remote snapshots rather than using tape backups. Otherwise, retrieve data as you normally would from the tape backup. P4000 Remote Copy user guide 51 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 52
to facilitate easy rollback of the primary volume. NOTE: Retention of snapshots affects the amount of space that is used in the cluster of storage systems. Balance the number of snapshots to retain with the amount of space you are willing to use. You can still access remote snapshots or tape backups - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 53
back the remote volume instead. Figure 19 on page 54 shows rollback of the primary snapshot while leaving the remote snapshots intact. P4000 Remote Copy user guide 53 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 54
Figure 19 nondestructive rollback from the primary snapshot . • To roll back the remote snapshot, you must first make the remote volume into a primary volume. This stops scheduled creation of remote snapshots, which may jeopardize your high availability, disaster recovery, or routine backup - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 55
the primary volume that you want to roll back by creating a one-time (manual) remote snapshot of it. 2. Roll back the volume. Before roll back, scheduled production application server. This capability supports a number of uses such as data mining or content distribution. P4000 Remote Copy user guide - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 56
read/write volume, make it into a primary volume. Configuration for data migration To make a copy of a volume in a remote location, configure a cluster of storage systems in the remote location with enough space to accommodate the volume. See Figure 21 on page 56 for an example configuration. Figure - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 57
4. Configure the application server in the new location to access the new primary volume. Figure 22 on page 57 shows the migration of data after converting a remote volume into a primary volume. Figure 22 Configuration after data migration . P4000 Remote Copy user guide 57 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 58
58 Sample Remote Copy configurations - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 59
://www.hp.com/support Before contacting HP, collect the following information: • Product model names and numbers • Technical support registration number (if applicable) • Product serial numbers • Error messages • Operating system type and revision level • Detailed questions Subscription service HP - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 60
Multi-Site HA/DR Solution Pack user guide • CLIQ - The SAN/iQ Command-Line Interface User Manual You can find these documents from the Manuals page of the HP Business Support Center website: http://www.hp.com/support/manuals In the Storage section, click Disk Storage Systems and then select P4000 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 61
HP-authorized service provider will determine whether a repair can be accomplished by CSR. For more information about CSR, contact your local service provider, or see the CSR website: http://www.hp.com/go/selfrepair This product has no customer replaceable components. P4000 Remote Copy user guide - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 62
and complete our online survey. This will provide us with valuable information that we will use to improve your experience in the future. http://www.hp.com/support/storagedocsurvey Thank you for your time and your investment in HP storage products. 62 Support and other resources - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 63
network bonding in which the logical interface performs load balancing of data transmission. add- storage systems that create the storage pool from which you create volumes. CMC Centralized Management Console. See HP StorageWorks P4000 Centralized Management Console. P4000 Remote Copy user guide - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 64
the volumes, snapshots, storage systems, and iSCSI sessions in the HP StorageWorks P4000 SAN Solution. It provides an overview of the storage network broken out by which the user transfers operation of the application server over to the remote volume. This can be a manual operation, a scripted - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 65
reports Hardware reports display point-in-time statistics about the performance and health of the storage system, its drives, and configuration. hostname The hostname on a storage system is the user-definable name that displays below the storage system icon in the network window. It is also - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 66
to protect data in an HP P4000 SAN solution. network window Graphically depicts the status of each storage system. Storage systems on the network are The primary volume that fails and then is returned to service. overprovisioned cluster An overprovisioned cluster occurs when the total - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 67
add-on applications. Registration requires sending in the storage system serial numbers to purchase the license keys, which are then applied to the storage system. The primary volume and its related remote volume is in the midst of a different reconfiguration. P4000 Remote Copy user guide 67 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 68
the primary site fails, customers can manually recover quorum in the secondary site. user-designated location in which storage systems are installed. Multi-Site SAN configurations have multiple sites with storage threshold is reached. solution pack HP StorageWorks P4000 Windows Solution Pack - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 69
storage server Storage server software maintains the customer's data. It reads to and writes from disks in response to customer reads and writes of SANiQ volumes. stripe Striped data is stored across all disks in the array, which increases performance Copy Service P4000 Remote Copy user guide 69 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 70
VSS Provider writable space HP StorageWorks P4000 VSS Provider is the hardware provider that supports the Volume Shadow Copy Service on the HP P4000 SAN Solution. See temporary space 70 Glossary - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 71
snapshots schedule, 15 C canceling remote snapshots, 25 changing backup site into new production site, 38 primary volume into remote volume, 34 clone of volume, 11 47 document conventions, 60 related information, 60 documentation HP website, 60 providing feedback, 62 P4000 Remote Copy user guide 71 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 72
34 failover configuring, 33 data availability during, 45 planning, 34 resuming production after, 36 scripting for, 34 setting up new site, 38 synchronizing configuration of Remote Copy, 47 HP technical support, 59 I icons for Remote Copy, 10 Insight Remote Support software, 59 M management groups - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 73
primary, 18 retention policy, 14 remote support software, 59 remote volumes adding, 21 creating manually, 21 creating on the fly, 21 using primary volumes and original primary volumes, 37 T technical support HP, 59 service locator website, 60 text symbols, 61 timeline of failover Copy user guide 73 - HP StoreVirtual 4000 | 9.0 HP StorageWorks P4000 Remote Copy User Guide - Page 74
W websites customer self repair, 61 HP, 60 HP Subscriber's Choice for Business, 59 product manuals, 60 74
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HP StorageWorks
P4000 Remote Copy user guide
Abstract
This guide provides information about configuring and using asynchronous replication of storage volumes and
snapshots across geographic distances.
For the latest version of this guide, see the HP website
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Part Number: AX696-96032
Fourth edition: November 2010