HP XP P9500 Storage - Manual (Page 60)

4. In the list, select the pair volume that is split and that you want to resynchronize, right-click,
and select Pairresync from the menu. The Pairresync dialog box displays.
5. If you are changing the P-VOL Fence Level, select a new fence level from the list. This is optional.
•
Data – The P-VOL is fenced if an update copy operation fails.
•
Status – The P-VOL is fenced only if the primary system is not able to change S-VOL status
to PSUE when an update copy operation fails.
•
Never – The P-VOL is never fenced.
For more information about Fence Level, see Fence Level options for I/O to the P-VOL after
suspension (page 21) .
6. From the Copy Pace list, select the number of the tracks, 1-15, for the resync operations. The
default is 15.
•
Between 1 and 5 is slow, and is used to lessen impact to host I/O.
•
Between 5 and 10 is a medium pace.
•
Between 11 and 15 is a fast pace. Host I/O performance can be lowered.
7. From the Priority list, enter the desired priority, or scheduling order, for the resync operation.
You can set priority from 1 to 256. The default is 32. For more on priority, see the descriptions
in
“Priority for initial copy operations and scheduling order” (page 24) .
8. Click Set, and then Apply.
If the operation does not start normally, an error code displays in the Error Code column in
the Preview list. To display an error message, select the LU, right-click, and select Error Detail.
9. Verify that the operation completed successfully and that pair status is PAIR on the Pair
Operation window. You can update the progress of the operation by clicking File/Refresh.
Releasing pairs
A Continuous Access Synchronous pair can be released or deleted. Doing this deletes the Continuous
Access Synchronous relationship, though not the volumes or their data.
•
When it is no longer necessary to maintain a remote copy of the P-VOL, release a pair from
the primary system only. All update operations are stopped and pair status for both the P-VOL
and S-VOL changes to SMPL.
When a pair is released, the primary system continues to accept write I/O to the former P-VOL
but does not keep track of the updates.
•
Release a pair from the secondary system only for disaster recovery purposes. When you do
this, the secondary system changes the S-VOL pair status to SMPL, but does not change the
P-VOL’s status. When the primary system performs the next Continuous Access Synchronous
operation for the pair, the primary system detects that the S-VOL status is SMPL, and then
changes P-VOL status to PSUS (Delete pair to RCU).
To restart a pair that was released from the secondary system, you must release the pair from
the primary system, then create the pair from the primary system.
NOTE: When you release a pair from the secondary system, remember that the S-VOL and P-VOL
are identical (for example, same volume label). Make sure to take appropriate precautions to
prevent a system problem due to duplicate volumes.
Procedure 14 To delete a pair
1. In Remote Web Console, click Actions > Remote Copy > Continuous Access Synchronous >
Pair Operation.
2. Change to Modify mode by clicking the icon.
60 Pair operations