HP XP Racks - Manual (Page 56)

5. For Primary Volume Fence Level, specify whether the primary system rejects write operations
to the P-VOL when the pair is split due to an error.
•
- Status: The P-VOL cannot be written to only if the primary system is not able to change
S-VOL status to PSUE.
•
- Never: The P-VOL can always be written to.
•
- Data: The P-VOL cannot be written to.
For more information, see “Allowing I/O to the P-VOL after a split—Fence Level options”
(page 20) .
6. For Copy Pace, specify the number of tracks to be copied during the initial copy. The range
is 1-15; 15 is the default. This option affects performance as follows:
- 1 to 5 is slow, improves performance and lowers impact to host I/O.
- 5 to 10 is medium.
- 11 to 15 is fast, may lower performance and increase impact to host I/O.
7. For Copy Priority, enter the 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 23) .
8. Click Finish.
9. In the Confirm window, review the settings and enter a task name in the Task Name box.
10. Click Apply to save your settings in the system.
Deleting pairs
A Continuous Access Synchronous pair can be deleted. Doing this deletes the Cnt Ac-S relationship,
though not the volumes or their data.
•
When it is no longer necessary to maintain a remote copy of the P-VOL, delete 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 unpaired.
When a pair is deleted, the primary system continues to accept write I/O to the former P-VOL
but does not keep track of the updates.
•
Delete 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 unpaired, the primary system
detects that the S-VOL status is unpaired, and then changes P-VOL status to PSUS (Delete pair
to RCU).
To restart a pair that was deleted from the secondary system, you must delete the pair from
the primary system, then create the pair from the primary system.
NOTE: When you delete a pair from the secondary system, make sure that the S-VOL and P-VOL
are identical, including the volume labels. Take all necessary steps to prevent system problems due
to duplicate volumes.
Procedure 13 To delete pairs
1. In the Storage Systems tree, click Replications > Remote Replications.
2. In the Remote Replications window, click the Cnt Ac-S Pairs tab, then select the pair or pairs
to be deleted.
3. From the Actions menu, click Remote Replications > Delete Pairs.
4. In the Delete Pairs window, ensure that the pairs to be deleted appear in the Selected Pairs
table.
56 Cnt Ac-S pair operations