HP XP P9500 Storage - Manual (Page 122)

Prerequisite information
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To Reverse Copy or Quick Restore, the pair must be split (PSUS status).
•
While you are performing a Quick Restore, make sure of the following:
The SVP is in View mode, not Modify mode ◦
◦ RWC configuration and other tasks are stopped
•
The Quick Restore cannot be used under the following conditions:
If either pair volume is a THP V-VOL ◦
◦ If the S-VOL is also part of an SS pair
•
The pairresync normally takes less time when the pair is split (PSUS status) than when the
pair is suspended (PSUE status). This is because the amount of differential data accumulated
for a split pair is usually far less than the total amount of data in the P-VOL, which must be
copied in full when the pair was suspended by the storage system.
•
If you use DKAs supporting encryption, you can create a BC 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 changes to non-encrypted data in the S-VOL.
•
If a pair consists of encrypted volumes and a non-encrypted volume, and the Quick Restore
is run, the P-VOL and S-VOL encryption statuses are reversed.
•
With a Quick Restore, RWC may show outdated information. Click Refresh View to ensure
the most up-to-date information.
•
To keep the P-VOL and S-VOL unsynchronized when performing a Quick Restore, enable the
Swap&Freeze option prior to performing the operation. Update copy operations are then
suppressed when the Quick Restore is completed, and the pair is in PAIR status.
•
If you perform a reverse or quick restore operation on a pair whose P-VOL is also paired with
other S-VOLs, the P-VOL and other S-VOLs are no longer synchronized.
•
For Reverse Copy or Quick Restore operation, the following restrictions apply:
Pairs sharing the same P-VOL must be split (PSUS status) or suspended (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 Cnt Ac-S or Cnt Ac-J, the Cnt Ac-S or Cnt Ac-J pair must
be suspended to perform either backward resync operation.
◦ Quick Restore cannot be performed when BC and shared Cnt Ac-S or Cnt Ac-J volumes
include an external volumes.
◦ You cannot create a Cnt Ac-S or Cnt Ac-J pair with a volume shared by BC during either
backward resync operation.
◦ When the Reverse Copy or Quick Restore operation is in progress, you cannot create,
split, or resync any pair sharing the same P-VOL. You can delete or suspend the pairs,
however.
1. In RWC, click Actions > Local Replications > BC/SS > Pair Operation.
2. Change to Modify mode by clicking the icon.
3. In the tree, in the Pair Operations window, select the port or host group where the pairs or
volumes are located.
Related volumes are shown in the volume list. If a volume is already paired, pair information
is also shown.
4. In the volume list, select the pairs to be resynchronized, right-click, and select Pairresync.
122 Pair operations (secondary window)