HP XP Business Copy Software - Manual (Page 53)

Business Copy XP user guide for the XP128/XP1024 53
Resynchronizing one or more BC pairs
1. Unmount the split (PSUS) S-VOLs before starting the pairresync operations. When the pairresync
operation starts, the disk array stops accepting write I/Os to the S-VOL.
2. In the BC main screen, select the port, host group, or P-VOL in the Tree View box to filter the volumes
displayed in the Volume list.
3. In the BC main screen, select the pairs to resync, right-click the selected pairs, and select Pairresync.
The Pairresync window appears.
4. In the Pairresync window, select the pairs, and set the copy pace (Slower, Medium, or Faster) and
resync type (Normal Copy, Quick Resync, Reverse Copy, or Quick Restore) for each pair. Reverse and
quick restore pairresync cannot be performed on suspended pairs (PSUE) or L2 cascade pairs.
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: Ensure that the correct resync direction (normal/quick, or reverse/quick restore) is
selected.
CAUTION: During the quick restore operation, the RAID levels, HDD types, and Cache LUN XP
settings are swapped. To avoid performance impact due to quick restore operations:
• 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 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.
• Because the 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 the 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.
– Release the Cache LUN XP settings of the P-VOL and S-VOL before the quick restore operation,
and reset the Cache LUN XP settings of the P-VOL and S-VOL after the pair changes to PAIR
status as a result of the quick restore operation.
If you do not want to resynchronize the P-VOL and S-VOL after the quick restore operation, set the
Swap&Freeze option before performing the quick restore operation.
5. Click OK. Repeat step 4 - step 5 until the Preset Volume list on the BC main screen displays the pairs
(settings).
NOTE: Ensure that the S-VOL is varied offline before starting pairresync operations.
6. In the BC main screen, click Apply to resync the specified pairs.
The BC main screen displays the results of the pairresync operations (that is, the pair status changed to
COPY(RS), COPY(RS-R), or PAIR).
7. Click Refresh ( ) to monitor the progress of the pairresync operations.