HP XP Business Copy Software - Manual (Page 21)

Business Copy XP user guide for the XP128/XP1024 21
restore operation. Quick restore cannot be performed on L2 cascade pairs. Table 5 lists operational
requirements for the quick restore operation.
Figure 5 Reverse and quick restore pair operations
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 RAID levels 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 XP 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 XP data to be down.
• Set the same Cache LUN XP settings (locations) for the P-VOL and S-VOL before performing the
quick restore operation.