Takeover operation – HP XP Racks User Manual
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CAUTION:
Take note of the following points:
•
Advanced operations can be performed per copy group or per copy pair.
•
Because the copy pair status cannot be retrieved in the event of a failure, it is not confirmed prior
to executing an operation. (Under normal circumstances, copy pair status confirmation is required
and is performed by the Device Manager agent.) In this instance, an error message is created
based on the information sent from the agent and is output for the Change Copy Pair Status task.
•
Takeover and swap operations cause the target copy pair or copy group to be treated as a different
copy pair or copy group after the operation. See “
Alert settings and volume switching
for more information.
Related topics
• Restoring an application replica from the Replica History
• Recovering a copy pair configuration definition file (takeback)
• Alert settings and volume switching
Takeover operation
The takeover operation is used to switch to the secondary site when there is a failure at the primary.
The resulting copy pair status depends on the environment where the takeover operation is executed.
If the takeover operation is executed when there is damage to the primary site, or a failure in the
primary site storage, the status of the secondary site will be Split (SSWS). In all other cases, the primary
volume and secondary volume of the copy pair are switched. You can check the execution results
based on the copy pair status and the relationship between the primary volume and secondary volume
that make up the copy pair.
NOTE:
Regarding pair status:
•
If the copy pair state cannot be obtained from the Device Manager agent, the state is Unknown.
•
When a failure occurs, it might not be possible to obtain the copy pair state of the target copy
pair. After the operation, the copy pair has a split primary volume, and a writable secondary
volume. As a result, the aggregate copy pair status is Suspend.
The takeover procedure is as follows:
1.
If the copy pair state is Unknown, a failure may have occurred. Check for failures outside of
Replication Manager.
2.
Using the Change Pair Status Wizard, create a takeover Change Copy Pair Status task for the
target copy group or copy pair.
3.
Check the Task List window to confirm that the status of the task is Success.
4.
View the target copy pair in the Pair Configurations view and check the task execution results
(whether the primary and secondary volumes have switched, and whether the secondary volume
has changed to Split (SSWS)).
5.
If necessary, set up My Copy Group settings and alert settings, and recreate the Change Copy
Pair Status task.
Managing pair life cycle
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