HP XP Continuous Access Software - Manual (Page 194)

To restore a pair that was released from the secondary storage system, first release the pair from
the primary storage system, and then restore the pair using the appropriate initial copy option.
Note: If a pair deletion is performed, it is possible that the deletion takes effect on the secondary
data volume later than it takes effect on the primary data volume. Therefore, an error may occur
if you reference the status of a pair or manipulate a pair immediately after the pair is deleted by
RAID Manager. If such an error occurs, check the status of the secondary data volume and then
retry referencing the pair status or manipulating the pair.
Figure 85 Pairsplit-S Window
The Pairsplit-S window shows the following:
•
Range: Specify the release range. The default is LU if two or more pairs in the same consistency
group are selected; the default is Group if not. Also, if the pair status is SMPL, Range is set to
LU. If the pair status is Deleting or Suspending, Range is set to Group.
◦ LU: Only the specified pair is released.
If you select pairs with both PAIR status and other than PAIR status in the same consistency
group, an unexpected suspension may occur during the pair operations (Pairsplit-r,
Pairsplit-S, and Pairresync) under heavy I/O load conditions. You can estimate whether
the I/O load is heavy or not from frequency of host I/Os. The pair operations should be
performed under light I/O load conditions.
◦ Group: All pairs in the same consistency group(s) as the selected pair(s) are released.
Caution: Do not use this option when releasing pairs at the secondary storage system
during disaster recovery.
If the following two conditions are satisfied and you click Apply, a warning message appears
and processing cannot be continued.
◦ The Preview list contains two or more pairs belonging to the same consistency group.
◦ The Range column shows Group for at least one of the above pairs.
To continue processing, do one of the following:
◦ Ensure that the Range column shows LU for all pairs in the same consistency group.
◦ In the Preview list, select all but one pair in the same consistency group, right-click the
selected pairs, and then select Delete.
•
Delete Mode: Specify whether to release the pair(s) forcibly. When the status of the pair(s) to
be released is SMPL or Deleting, the default setting is Force. Otherwise, the default setting is
Normal.
◦ Force: The pair is forcibly released even if the primary storage system is unable to
communicate with the secondary storage system. This option may be used to free a host
194 Performing XP Continuous Access Journal Pair Operations