Performing a unplanned switchover
Beginning with System Manager 9.6, you can initiate an unplanned switchover of a MetroCluster site. This operation is useful after an outage event or disaster event.
Your MetroCluster is running in normal operating condition; however, the nodes in the local cluster (Site A) are up, but the nodes in the remote cluster (Site B) are down.
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Verify that Site B is actually down.
A connection error might make Site B appear to be down.
Starting the switchover process with Site B up could cause disastrous results.
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In System Manager, log on to the local MetroCluster site (Site A) using the cluster administrator credentials.
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Click Configuration > MetroCluster
TheMetroCluster Switchover/Switchback Operations window displays.
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Click Next.
The MetroCluster Switchover/Switchback Operations window displays the status of the operations, and System Manager verifies whether a negotiated switchover is feasible.
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When the validation process is complete, click Switchover Site B to Site A to initiate the switchover process.
A warning message displays, warning you that the switchover operation switches control from Site B to Site A. The status of Site B should be “UNREACHABLE”, and all Site B nodes are shown in red text.
As noted in Step 1, Site B must actually be down and not just unconnected. Also, you should be aware that the switchover operation might cause data loss.
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If you want to proceed, ensure the check box is checked, and then click Yes.
The switchover process begins. The states of Site A and Site B are displayed above the graphic representations of their configurations. If the switchover operation fails, an error message displays. Click Close. Correct any errors and start again at Step 1
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Perform all required maintenance activities for Site B.
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Ensure Site B is up.
The healing process begins. When System Manager shows the healing is completed, Site B is operational and the systems prepare for the switchback process. The Switchback from Site A to Site B button appears at the bottom of the window.
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Proceed to Performing a switchback to initiate the switchback operation.