6 performing xp continuous access pair operations, Preparing for xp continuous access pair operations – HP StorageWorks XP Remote Web Console Software User Manual
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6 Performing XP Continuous Access Pair Operations
This chapter provides instructions for performing XP Continuous Access pair operations
•
“Preparing for XP Continuous Access Pair Operations” (page 120)
•
“Pair Operation Window” (page 121)
•
“XP Continuous Access Snapshot Function” (page 122)
•
“Creating XP Continuous Access Pairs” (page 123)
•
“Initial Copy Options” (page 127)
•
•
“Changing Pair Options” (page 129)
•
“Viewing XP Continuous Access Pair Status” (page 131)
•
“Splitting XP Continuous Access Pairs” (page 133)
•
“Resynchronizing XP Continuous Access Pairs” (page 137)
•
“Releasing XP Continuous Access Pairs” (page 140)
•
“Powering Off/On XP Continuous Access Components” (page 144)
•
“Planned Outage of the MCU” (page 145)
•
“Planned Outage of the RCU or Remote Copy Connection” (page 145)
•
“Pinned Track Recovery for XP Continuous Access Volumes” (page 146)
Preparing for XP Continuous Access Pair Operations
Before starting XP Continuous Access operations, you must consider the relative importance of
storage system I/O performance and disaster recovery preparation. Remote copy operations can
affect the I/O performance of the MCUs and RCUs. XP Continuous Access provides many options
(RCU options, initial copy options, pair options, group options, async options) that allow you to
control the impact of XP Continuous Access operations on I/O performance. These options can
be set separately for each pair, for each XP Continuous Access Asynchronous group, and for each
MCU to provide maximum flexibility. You can select options that minimize the impact of XP
Continuous Access operations on storage system performance or options that maximize the
effectiveness of XP Continuous Access operations to ensure the best level of backup data integrity.
System-level factors (for example, number of paths) can also affect XP Continuous Access operations
and storage system performance. Review the information in
“Optimizing XP Continuous Access
Operations and Storage System Performance” (page 117)
).
For XP Continuous Access disaster recovery operations, you should make sure that the RCUs are
attached to a host server to enable reporting of sense information and transfer of host failover
information. If the remote site is unattended, you should attach the RCUs to a host server at the
main site so that the system administrator can monitor the operational condition of the RCUs.
To prepare for XP Continuous Access pair operations, you need to identify the volumes (by port,
GID (host group number), and LUN, and/or by LDEV ID) for which you want to establish XP
Continuous Access remote copy operations. You should identify volumes that are required for
system operations as well as volumes that contain important data to be backed up (for example,
DB log files). Copying these volumes to the remote site will enable faster disaster recovery than
maintaining a current version of these files at the remote site. For large databases that span multiple
volumes, you should plan to establish an XP Continuous Access Asynchronous consistency group
for each database so that the update sequence consistency of the database can be ensured at the
remote site.
120 Performing XP Continuous Access Pair Operations