HP XP Continuous Access Software - Manual (Page 145)

NOTE: If the following conditions are satisfied and you click Apply, a warning message
appears and processing cannot continue:
– The Preset list contains two or more pairs belonging to the same consistency group.
– The Range column displays Group for at least one of the above pairs.
To continue processing, do one of the following:
– Ensure that the Range column displays LU for all pairs in the same consistency group.
– In the Preset list, select all but one pair in the same consistency group, right click the
selected pairs, and select Delete.
•
Suspend Mode: Specifies how to deal with update data that was not copied to the secondary
data volume.
◦ Flush: When splitting the pair, update data is copied to the secondary data volume. This
is the default.
When the secondary array receives a request for splitting a pair, all journal data (that
is, update data) that the pair retains is written to the secondary data volume. After that,
the pair's status changes from Suspending to PSUS if the pair does not retain any journal
data for a certain time period.
◦ Purge: When splitting the pair, update data is not copied to the secondary data volume.
If you restore the pair later, update data is copied to the secondary data volume.
•
Set: Applies settings to the Preset list in the Pair Operation pane.
•
Cancel: Discards settings.
Restoring a pair of data volumes
Use the Pairresync pane ( Figure 64 (page 146) ) to restore a pair that was split. In addition, you
can recover a mirror and start data copying for a contingency XP Continuous Access Journal pair
in HOLD status to perform a delta resync operations.
NOTE: If the primary or secondary array is powered off and its backup batteries are fully
discharged while pairs are suspended, the M-VOL/R-VOL bitmaps are not retained. In this unlikely
case, the primary/secondary array marks all cylinders/tracks of all suspended volumes as modified,
so the primary array performs the equivalent of an entire initial copy operation when the pairs are
resumed.
The primary array administrator can use the following procedure to restore one or more pairs that
were split, or perform delta resync operations. The secondary array administrator cannot perform
this procedure.
1. Ensure that XP Command View Advanced Edition Software or XP Remote Web Console is in
Modify mode. For more information, see the HP StorageWorks XP Command View user guide
for XP Disk Arrays or the HP StorageWorks XP Remote Web Console user guide for
XP12000/XP10000/SVS200.
2. Display the Pair Operation pane (see Displaying the Pair Operation pane ).
3. If any pair was suspended due to an error condition (use the Pairdisplay pane to view the
suspend type), ensure that the error condition has been removed. The primary array will not
resume the pairs until the error condition has been removed.
4. In the tree, select Subsystem or a ( ).
Restoring a pair of data volumes 145