HP XP7 Storage - Manual (Page 46)

Based on the initial copy option you selected, you can verify that the pair status is correct in the
Remote Replication window.
Current Pair Status Should Be Initial Copy Option
COPY or PAIR Entire or None
HOLD, HOLDING Delta
You can also monitor the progress of the operation by clicking File > Refresh in the menu bar. This
updates the information in the list.
Splitting Cnt Ac-J pairs
When you split a pair, write-data is no longer sent to S-VOL and the pair is no longer synchronized.
Splitting a pair or mirror gives you a point-in-time copy of the P-VOL.
Prerequisite information
•
This operation can be performed from the primary or secondary system.
•
Pair status must be COPY or PAIR.
•
To split multiple pairs at the same time, the pairs must belong to the same mirror. This ensures
sequence consistency among S-VOLs in the mirror.
•
Pairs in a RAID Manager consistency group consisting of multiple primary and secondary
systems can only be split in the mirror.
The following additional information may be useful before beginning the procedure:
•
Performing the pair split when I/O load is low reduces impact on performance. Operations
on multiple pairs in the same consistency group with different statuses may result in suspension
during periods of heavy write I/O.
•
If you split pairs in PAIR status and other than PAIR status in the same mirror, an unexpected
suspension could occur during the operation under heavy I/O load conditions. You can
estimate whether the I/O load is heavy or not from frequency of host I/Os. This operation
should be performed under light I/O load conditions.
•
During normal operations, the secondary system rejects write operations to an S-VOL. However,
you can enable write operations to the S-VOL during the pair split operation. When you do
this, then resync the pair, the secondary system sends the S-VOL track bitmap to the primary
system to ensure proper resynchronization of the pair. This S-VOL Write option is described
in the pair-split procedure.
Procedure 2 To split one or more pairs
1. In the Storage Systems tree, click Replication > Remote Replication, and then select the Cnt
Ac-J Pairs tab.
2. From the list, select the pairs to be split.
3. From the Actions menu, click Remote Replication > Split Pairs.
4. In the Split Pairs window, review the pairs to be split in the Selected Pairs table. You can
remove a pair from the table by selecting it and clicking Cancel.
46 Cnt Ac-J pair operations