HP XP P9500 Storage - Manual (Page 46)

- Business Copy Z (BC Z) pair when the P-VOL is shared with an FC Z/FCSE volume
•
Quick Restore, P-VOL and S-VOL are swapped. NO data is copied, and the pair is placed in
DUPLEX status. Differential data is copied to the S-VOL during update copy operations.
◦ Differential data is copied during update copying.
◦ The P-VOL and S-VOL are inaccessible during this operation. When the operation
completes, the P-VOL is accessible.
◦ Pairs sharing the same P-VOL must be in Split/SUSPOP or Suspend/SUSPER status.
◦ When there is a small amount of differential data between P-VOL and S-VOL, the Reverse
Copy operation may complete faster than the Quick Restore operation.
◦ Performing LDEV maintenance during the Quick Restore process increases the time for
the operation to complete.
◦ If the pair shares a volume with Cnt Ac-S Z or Cnt Ac-J Z, you must suspend the Cnt Ac-S
Z or Cnt Ac-J Z pair to perform the Reverse Copy or Quick Restore operation.
◦ You cannot create a Cnt Ac-S Z or Cnt Ac-J Z pair with a volume shared by BC Z during
the Reverse Copy or Quick Restore 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. However, the pairs can be deleted or
suspended.
◦ Quick Restore cannot be used for the following:
- When a quick format is being performed on either pair volume
- A pair in which one volume is a THP V-VOL, though not both
- On a Cross OS File Exchange pair
- A BC Z pair whose P-VOL is shared with an FC Z/FCSE volume
Prerequisite information for resynchronizing
•
For Normal Copy and Quick Resync, the S-VOL must be offline.
•
For Reverse Copy and Quick Restore, the P-VOL must be offline.
•
For Reverse Copy or Quick Restore, the pair must be in Split/SUSPOP status.
•
The pairresync normally takes less time when the pair is in Split/SUSPOP status than when it
is in Suspend/SUSPER. This is because the amount of differential data accumulated for a split
pair is usually much 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.
•
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 DUPLEX status.
•
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 can show outdated information. Click Refresh View to ensure
the most up-to-date information.
Resynchronizing pairs
1. In the tree, click Replications > Local Replications.
2. In the Pairs tab, select the pair you want to resynchronize, then click Resync Pairs.
46 Performing pair operations