HP XP P9500 Storage - Manual (Page 18)

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When using multiple software products simultaneously. If you are using more than one software
product at the same time, ensure that your storage system is configured for optimal performance,
such as sufficient cache. Contact HP Technical Support. Concurrent use affects the performance
and the operation of the other software products.
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When using AIX host servers. Best performance results when P-VOLs are located on one AIX
host server and paired S-VOLs on another. The problem with using one AIX host server for
both P-VOLs and S-VOLs is that during the paircreate or pairresync operation, the P-VOL and
S-VOLs have the same PVID. If the host server reboots when this is the case, it can mis-identify
the volumes and identify the S-VOL as the P-VOL after rebooting.
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Preparing for resynchronization by Quick Restore. During a quick restore operation, in which
the contents of the P-VOL and S-VOLs are swapped, the RAID levels, HDD types, and Cache
Residency settings of the two volumes are also exchanged. To avoid performance impact,
consider the following:
◦ Both pair volumes should have the same RAID level and HDD type before performing the
quick restore operation. You can resume the original RAID levels after the quick restore
by again splitting the pair and performing the quick restore.
◦ Set the same Cache Residency settings (locations) for the P-VOL and S-VOLs before the
quick restore operation.
Alternatively, you can release Cache Residency settings before the quick restore operation,
then reset them when the operation is completed.
For more information about settings, see the HP XP P9000 Performance for Open and
Mainframe Systems User Guide.
CAUTION: Do not perform the Quick Restore when the P-VOL and S-VOLs are in different CLPRs,
otherwise the two volumes will be reversed when the operation completes.
Consistency group pair-split at a specific time
With a consistency group, you perform tasks and change the pair status on a group of pairs.
With the consistency group pair-split feature, you define a specific time to split pairs in a consistency
group. This allows you to copy data from the P-VOLs in the consistency group to the S-VOLs
simultaneously. The S-VOLs will contain the same data as the P-VOLs when the operation is
performed.
18 Requirements and planning