HP XP P9500 Storage - Manual (Page 110)

Prerequisite information
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For the Reverse Copy or Quick Restore operation, the pair must be in PSUS status.
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When running a Quick Restore operation, make sure of the following:
The SVP is in View mode, not Modify mode ◦
◦ Remote Web Console configuration and other tasks are stopped
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The Quick Restore cannot be used under the following conditions:
If either pair volume is a THP V-VOL ◦
◦ If the secondary volume is also part of a Snapshot pair
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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 data in the P-VOL, which must be copied in full when the pair was
suspended by the storage system.
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If you use 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 become 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.
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With a Quick Restore, Remote Web Console may display outdated information. Click Refresh
View to insure the most up-to-date information.
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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 a reverse or quick restore operation is performed 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 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, the Continuous Access Synchronous or Continuous Access Journal pair must be
suspended to perform either backward resync operation.
◦ Quick Restore cannot be performed when Business Copy and shared Continuous Access
Synchronous or Continuous Access Journal volumes include an external volumes.
◦ You cannot create a Continuous Access Synchronous or Continuous Access Journal pair
with a volume shared by Business Copy 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.
Procedure 15 To resynchronize a pair
1. In Remote Web Console, click Actions > Local Replications > BC/SS > Pair Operation.
2. Change to Modify mode by clicking the icon.
110 Pair operations (secondary window)