Resynchronize Pairs - HP StorageWorks P9000 - Disk Arrays User Manual

4. Select the pair(s) that you want to suspend (or the volume(s) whose pairs you want to suspend),
right-click the selected pair(s) to display the menu, and select the Suspend Pair command to
open the Suspend Volume Pair dialog box.
5. On the Suspend Volume Pair dialog box, select the pair(s) you want to suspend, and click OK
to reflect the settings to the Preview List on the Pair Operation window.
To remove pair(s) from the list, select the unneeded pair(s), right-click while selecting the pair(s),
and then select the Delete command from the menu that displays by right-clicking.
6. Repeat steps 4 and 5 to suspend additional pairs in the Pair Operation window.
7. On the Pair Operation window, click Apply to suspend the specified pair(s).
The Pair Operation window displays the result(s) of the Suspend Volume Pair operation(s) (i.e.,
pair status changed to Suspend).

Resynchronize pairs

You resynchronize a pair that was split by a user or suspended by the system. Resynchronizing
updates the T-VOL so that it is again paired with the S-VOL.
CAUTION:
data. To make the S-VOL data and the T-VOL data equal, split the pair and make the pair status
Split.
You can forward resync—from S-VOL to T-VOL, and reverse resync—from T-VOL to S-VOL.
You can perform a Normal Copy or a Quick Resync, in both directions.
◦
◦ The S-VOL remains accessible to hosts for both read and write operations during a Normal
Copy operation. The T-VOL becomes inaccessible to hosts during a Normal Copy
operation.
◦ The S-VOL remains read-disabled during the Reverse Copy operation.
In a forward Quick Resync from S-VOL to T-VOL, status changes to Duplex without actually
resynchronizing the data in the T-VOL. Differential data is copied to the T-VOL when update
copy operations are performed.
◦ The S-VOL remains accessible to all hosts for both read and write operations during a
quick resync operation. The T-VOL becomes inaccessible to all hosts during a Normal
Copy operation.
In a forward Quick Resync you cannot be sure the data in the S-VOL and T-VOL is the
◦
same when there is no host I/O during the operation. You must split the pair to ensure
that data is the same.
Resynchronizing the pair does not guarantee that S-VOL data is the same as T-VOL
Resynchronize pairs 31