HP XP P9500 User Manual page 38

In a reverse Quick Resync (called Quick Restore), the P-VOL and S-VOL are swapped. No
actual data is copied, and the pair is placed in PAIR status.
The P-VOL and S-VOL are inaccessible during this operation. As soon as the Reverse
◦
Copy operation is complete, the P-VOL becomes accessible.
◦ When differential data between P-VOL and S-VOL is small, the Reverse Copy operation
may be completed faster than the Quick Restore operation.
If you perform maintenance with the SVP or the Remote Web Console during the Quick Restore
operation, the processing time of this operation may take longer. If you must complete the
Quick Restore operation within a given length of time, do not perform maintenance during
the Quick Restore operation.
CAUTION:
or perform the Quick Restore operation when the SVP is in the Modify mode, the status of the
Business Copy pair may be held in COPY(RS-R). Also, during the configuration with the Remote
Web Console, the status of the Business Copy pair may be held in COPY(RS-R). When you resume
the Quick Restore operation, stop the configuration and tasks with Remote Web Console.
Prerequisite information
With the Reverse Copy or Quick Restore operation, the pair must be in PSUS status.
The pairresync normally takes less time when the pair is in PSUS status than for PSUE status.
This is because the amount of differential data accumulated for a split pair is usually far less
than the total amount of the P-VOL, which must be copied in full if the pair is suspended by
the system.
If you use the DKAs supporting encryption, you can create a Business Copy pair by using an
encrypted volume and a non-encrypted volume. For example, you can create the pair specifying
an encrypted volume as the P-VOL and a non-encrypted volume as the S-VOL. In this case,
data in the encrypted P-VOL will be copied as non-encrypted data in the non-encrypted S-VOL.
If a pair consists of encrypted volumes and a non-encrypted volume, and the Quick Restore
is executed, the P-VOL and S-VOL encryption statuses are reversed.
With a Quick Restore, Remote Web Console may display outdated information. Click
File/Refresh to insure the most up-to-date information.
With a Quick Restore, to keep the P-VOL and S-VOL unsynchronized, enable the Swap&Freeze
option before performing the Quick Restore. Update copy operations are then suppressed
when the Quick Restore is completed and the pair is in PAIR status.
If the reverse or quick restore pairresync operation is performed on one Business Copy pair
in a 1 to n Business Copy configuration (n>1), the P-VOL and the other S-VOL are no longer
synchronized.
With the Reverse Copy or Quick Restore operation, the following restrictions apply:
◦ Neither Reverse Resync option can be performed on pairs in the PSUS status.
◦ Pairs sharing the same P-VOL must be in PSUS or PSUE status.
If a Quick Format is being performed on either of the pair volumes, the Quick Restore
◦
operation cannot be performed.
If the pair shares a volume with Continuous Access Synchronous or Continuous Access
◦
Journal, and the Continuous Access Synchronous or Continuous Access Journal pair is
not suspended, neither backward resync operation can be performed.
◦ Quick Restore cannot be performed when Business Copy and shared Continuous Access
Synchronous or Continuous Access Journal volumes include an external volume(s).
38 Performing pair operations
If you change the mode of SVP to the Modify mode during the Quick Restore operation