HP StorageWorks XP Business Copy Software user guide: HP XP12000 Disk Array, HP XP10000 Disk Array, HP 200 Storage Virtualization System (T1713-96027, April 2010)

NOTE:
The P-VOL remains read-enabled during the quick restore operation only to enable the host to
recognize the volume. Data on the P-VOL is not guaranteed until the quick restore operation is complete
and the status changes to PAIR.
NOTE:
When a quick restore operation is in progress, the array management user interface may display old
configuration information. To update the information in the user interface, wait for the quick restore
operation to finish, and click Refresh.
CAUTION:
During a quick restore operation, the RAID levels, HDD types, and Cache LUN settings of the P-VOL
and S-VOL are exchanged. For example, if the P-VOL has a RAID-1 level and the S-VOL has a RAID-5
level, the quick restore operation changes the P-VOL to RAID-5 and the S-VOL to RAID-1.
To avoid any performance impact due to the quick restore operation
1. Ensure that the P-VOL and S-VOL have the same RAID level and HDD type before performing the
quick restore operation. To restore the original volume designations after a quick restore, stop
host I/Os to the pair, split the pair, perform the quick restore operation for that pair again, and
restart host I/Os to the pair.
2. Because Cache LUN settings are exchanged during a quick restore operation, you must perform
one of the following operations. If you do not, the change of location of cache residence areas
may cause I/O performance to the Cache LUN data to be down.
• Set the same Cache LUN settings (locations) for the P-VOL and S-VOL before performing the
quick restore operation.
• Release the Cache LUN settings of the P-VOL and S-VOL before the quick restore operation,
and reset the Cache LUN settings of the P-VOL and S-VOL after the pair changes to PAIR status
as a result of the quick restore operation.
CAUTION:
If you do not want the P-VOL and S-VOL to be resynchronized after the quick restore operation, set
the Swap&Freeze option before performing the quick restore operation (see Swap&Freeze option).
Table 6 shows the requirements for reverse and quick restore pairresync operations. If you perform
these operations on pairs that do not fulfill the requirements, the reverse copy or quick restore command
is rejected.
Table 6 Requirements for reverse or quick restore pairresync operations
RequirementsParameter
The specified pair must be in the PSUS state. All other pairs sharing the same
P-VOL as the specified pair must also be in the PSUS or PSUE state.
Pair status
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