HP StorageWorks Continuous Access XP user guide for the XP10000/XP12000 (December 2005)

Continuous Access XP user guide for the XP10000/XP12000 87
Continuous Access XP pairs still using that path, and you cannot delete a group until you delete all
Continuous Access XP Asynchronous pairs in that group.
1. Delete all Continuous Access XP pairs from MCUs (pairsplit-S, see ”Deleting Continuous Access XP
volume pairs (Pairsplit-S)” on page 99). For Continuous Access XP Async pairs, use the Delete
Range-Group option to delete all pairs in a group at one time. Verify that the pair status changed to
SMPL for all Continuous Access XP volumes before continuing.
2. Delete Continuous Access XP Async groups from MCUs (see ”Deleting consistency groups (Delete CT
Group)” on page 79). The RCU automatically deletes a group when all pairs in the group are deleted.
3. Delete RCUs (see ”Deleting RCUs (Delete RCU)” on page 70). Check each CU image of each MCU to
ensure that all RCUs are deleted before continuing.
4. Remove remote copy connections (physical paths). If you are not familiar with the operation of remote
copy hardware components, call HP technical support for assistance.
5. For Fibre Channel interface, reset initiator ports to ordinary targets at MCUs (see ”Port change
operation” on page 74).
Performing Continuous Access XP pair operations
Preparing for Continuous Access XP volume pair operations
Before starting Continuous Access XP operations, consider the relative importance of disk array I/O
performance and disaster recovery preparation. As described in ”Optimizing Continuous Access XP
operations and disk array performance” on page 85, remote copy operations can affect I/O performance
of MCUs and RCUs. Continuous Access XP provides many options (initial copy options, pair options,
group options, async options) to control impact of Continuous Access XP operations on I/O performance.
These options can be set separately for each pair, Continuous Access XP Async group, and MCU to
provide maximum flexibility. You can select options that minimize impact of Continuous Access XP
operations on disk array performance or options that maximize effectiveness of Continuous Access XP
operations to ensure the best level of backup data integrity. System-level factors (for example, number of
paths) can also affect Continuous Access XP operations and disk array performance (see Table 24).
For Continuous Access XP disaster recovery operations, ensure that RCUs are attached to a host server to
enable sense information reporting and host failover information transferring. If the remote site is
unattended, attach RCUs to a host server at the main site, so the system administrator can monitor
operational condition of RCUs.
To prepare for Continuous Access XP volume pair operations, identify volumes (by port, TID, and LUN
and/or by LDEV ID) for which you want to establish Continuous Access XP remote copy operations.
Identify volumes required for system operations and volumes containing important data to be backed up
(for example, DB log files). Copying these volumes to the remote site enables faster disaster recovery than
maintaining a current version of these files at the remote site. For large databases spanning multiple
volumes, plan to establish a Continuous Access XP Asynchronous consistency group for each database, so
update sequence consistency of the database can be ensured at the remote site.
Start creating Continuous Access XP volume pairs as soon as you have:
• Identified volumes (LUs) that will become Continuous Access XP P-VOLs (and S-VOLs).
• Ensured that all system and Continuous Access XP requirements are met (see ”System requirements” on
page 31 and ”Requirements and restrictions” on page 31).
• Completed hardware and software installation (see ”Installing hardware” on page 33 and ”Fibre
Channel remote copy connections” on page 34).
• Configured MCUs and RCUs for Continuous Access XP operations (see ”Configuring MCUs and RCUs
for Continuous Access XP operations” on page 37).
If you will use Continuous Access XP to perform remote copy operations, the Command View XP
management station must be LAN-attached to the MCU of each Continuous Access XP volume pair. You
should also install and attach a Command View XP management station to RCUs at your remote site. If you
will use RAID Manager commands instead of Continuous Access XP, contact your HP account support
representative for information about Continuous Access XP configuration services.