Restoring a pair of data volumes, Restoring a pair of data volumes” on, Restoring a pair of – HP StorageWorks XP Remote Web Console Software User Manual
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120 Continuous Access XP Journal
• Enable: Hosts can write data to the secondary data volume while the pair is split. This option is
available only when the selected volume is a primary data volume.
•
Range: Specify the split range. If you select two or more pairs in the same consistency group, the
default is LU. Otherwise, the default is Group.
• LU: Only the specified pairs are split.
NOTE:
If you select pairs with PAIR status and other than PAIR status in the same consistency
group, an unexpected suspension might 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 the host I/O frequency. The suspend pair operations should be performed under light I/O
load conditions.
• Group: All pairs in the same consistency groups as the selected pairs are split.
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: Specify how to deal with update data that was not copied to the secondary data
volume.
• Flush: When you split the pair, update data is copied to the secondary data volume. This is the
default.
When the secondary disk 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 you split 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 to restore a pair that was split.
NOTE:
If the primary or secondary disk array is powered off and its backup batteries are fully discharged
while pairs are suspended, the P-VOL/S-VOL bitmaps are not retained. In this unlikely case, the
primary/secondary disk array marks all cylinders/tracks of all suspended volumes as modified, so the
primary disk array performs the equivalent of an entire initial copy operation when the pairs are resumed.
The administrator of the primary disk array can use the following procedure to restore one or more pairs
that were split. The administrator of the secondary disk array cannot perform this procedure.
1.
Ensure that the Command View XP or XP Remote Web Console main pane is in Modify mode. For
more information, see the HP StorageWorks Command View XP User Guide for XP Disk Arrays or the
HP StorageWorks XP Remote Web Console User Guide for XP12000/XP10000.
2.
Ensure that the Pair Operation pane is displayed (”