HP XP P9500 Storage - Manual (Page 57)

by the CU configuration or a remote copy path error. Review the error, release the pair with
the error, and then retry the Paircreate operation.
10. In the Error Level list, select one of the following options to take place in the event a failure
occurs during this operation:
•
Mirror, to cause all pairs in the failed pair’s mirror to be split. Mirror is the default.
•
LU, to cause only the pair that failed to be split.
11. Click Set to close the Paircreate dialog box.
12. See the Preview list to check the settings that you have made.
•
If you want to modify a setting, select and right-click the item in the Preview list and then
select Modify.
•
If you want to delete a item, select and right-click the item in the Preview list and then
select Delete.
13. Click Apply to apply the settings and create pairs. If an error occurs during creating pairs,
right click the item in the Preview list and select Error Detail.
14. In the Pair Operation window, verify that pair status is correct based on the initial copy option
you selected in Step 8.
Current Pair Status Should Be Initial Copy Option
COPY or PAIR Entire or None
HOLD, Holding Delta
15. 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 on the Detailed Information dialog
box. See
“Monitor pair activity and status” (page 67) for more information.
Split a pair
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. For details about a point-in-time copy, see
“Create a point-in-time copy ” (page 59) .
Prerequisite information
•
A pair can be split from the primary or secondary system.
•
Pair status must be COPY or PAIR to perform the split operation.
•
If you want to split multiple pairs at the same time, the pairs must belong to the same mirror.
Doing this insures sequence consistency among S-VOLs in the mirror.
•
Best practice is to perform pair split when I/O load is low. This reduces impact on performance.
Operations on multiple pairs in the same consistency group with different statuses may result
in suspension during high periods of write I/O.
•
Journal data may not be copied to the S-VOL depending on the option you select.
•
During normal Continuous Access Journal 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 insure proper resynchronization of the pair. This
S-VOL Write option is described in the pair-split procedure.
Split a pair 57