Place controller online
If a controller is in the offline state or in service mode, you can place it back online.
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Select Hardware.
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If the graphic shows the drives, click the Controllers & Components tab.
The graphic changes to show the controllers instead of the drives.
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Click a controller that is in either the offline state or service mode.
The controller's context menu appears.
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Select Place online, and confirm that you want to perform the operation.
Detection of a restored preferred path by the multipath driver can take up to 10 minutes.
Any volumes originally owned by this controller are automatically moved back to the controller as I/O requests are received for each volume. In some cases, you might need to manually redistribute the volumes with the Redistribute volumes command.