HP XP P9500 Storage - Manual (Page 58)

15. In the Pair Operation window, verify that the pair status is correct based on the initial copy
option:
Current Pair Status Should Be Initial Copy Option
COPY or PAIR Entire or None
HOLD, Holding Delta
16. (Optional) You can monitor the progress of the paircreate operation by clicking File > Refresh
in the menu bar. This updates the information in the list.
You can also review current pair activity and pair status in the Detailed Information dialog
box. See
“Monitoring pair activity and status” (page 66) for more information.
Splitting 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.
•
When splitting pairs in a journal that is in a RAID Manager consistency group consisting of
multiple primary and secondary systems, make sure to select Mirror in the Range field. If you
select LU, the pair will not be split.
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 the 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 7 To split one or more pairs
1. In the Remote Web Console main window, select Actions > Remote Copy > Continuous Access
Journal > Pair Operation.
2. Click to change the mode from View to Modify.
3. In the tree, select the port or host group for the pair.
4. From the list of volumes in the right pane, select the pairs that you want to split, right-click,
and select Pairsplit-r from the menu.
58 Pair operations