HP XP P9500 Storage - Manual (Page 70)

by the CU configuration or a remote copy path error. Review the error, release the pair with
the error, and then retry the Add Pair 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.
•
Volume, to cause only the pair that failed to be split.
11. In the CFW box, select one of the following to specify whether to copy cache-fast-write data
to the S-VOL or not:
•
Only P-VOL: does not copy cache-fast-write data to the S-VOL (the default).
•
Copy to S-VOL: copies cache-fast-write data to the S-VOL.
12. Click Set to close the Paircreate dialog box.
13. See the Preview list to check the settings that you have made.
•
If you want to modify a setting, select and right click the setting in the Preview list and
then select Modify.
•
If you want to cancel a setting, select and right click the setting and then select Cancel.
14. Click Apply to apply the settings and create pairs. If an error occurs during creating pairs,
the error code appears in the rightmost column of the Preview list. To view detailed information
about the error, right click the error code and select Error Detail.
15. In the Pair Operation window, verify that pair status is correct based on the initial copy option
you selected in Step 7.
Current Pair Status Should Be Initial Copy Option
Pending or Duplex Entire or None
HOLD, Holding Delta
16. 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, status” (page 79) 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 72) .
Prerequisite information
•
A pair can be split from the primary or secondary system.
•
Pair status must be Duplex 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 Z operations, the secondary system rejects write
operations to an S-VOL. However, you can enable write operations to the S-VOL during the
70 Pair operations