HP StorageWorks XP Remote Web Console Software - Manual (Page 152)

Figure 68 Suspend Pair Window
The Suspend Pair window displays the following information:
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S-VOL Write: Allows you to specify whether to permit hosts to write data to the secondary
data volume. The default is Disable (that is, do not permit):
◦ Disable: Hosts cannot write data to the secondary data volume while the pair is split.
◦ 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: Allows you to specify the split range. The default is Volume if two or more pairs in the
same mirror are selected. The default is Group if not.
◦ Volume: Only the specified pair(s) will be split.
NOTE: If you select pairs with Duplex status and other than Duplex status in the same
mirror, an unexpected suspension may occur during the pair operations (Suspend Pair,
Delete (release) Pair, and Resume Pair) 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 suspend pair
operations should be performed under light I/O load conditions.
◦ Group: All pairs in the same mirror(s) as the selected pair(s) will be split.
If the following two conditions are satisfied and you select Apply, a warning message will be
displayed and processing cannot be continued:
◦ The Preview list contains two or more pairs belonging to the same mirror.
◦ The Range column displays Group for at least one of the above pairs.
To continue processing, do either of the following:
◦ Ensure that the Range column displays Volume for all pairs in the same mirror.
◦ In the Preview list, select all but one pair in the same mirror, right click the selected pairs,
and then select Delete.
•
Suspend Mode: Allows you to specify how to deal with update data that has not been copied
to the secondary data volume. The default is Flush:
◦ Flush: When you split the pair, update data will be copied to the secondary data volume.
When the secondary storage system receives a request for splitting a pair, all the journal
data (that is, update data) that the pair retains will be written to the secondary data
volume. After that, the status of the pair will change from Suspending to Suspend if the
pair does not retain any journal data for a certain period of time.
◦ Purge: When you split the pair, update data will not be copied to the secondary data
volume. If you restore the pair later, the update data will be copied to the secondary data
volume.
•
Set: Applies the settings to the Preview list in the Pair Operation window “Pair Operation
Window” (page 136) .
•
Cancel: Discards the settings.
152 Performing URz Pair Operations