The ability to reset the controller is a recovery option available in the event of serious controller errors. Resetting a controller makes it unavailable for input/output (I/O) until the reset has been completed. If a host is using volumes owned by the controller being reset, the I/O directed to the controller will be rejected. Before resetting the controller, either verify that the volumes owned by the controller are not in use or ensure that there is a multipath driver installed on all hosts using these volumes.
To reset a controller:
The Array Summary page is displayed.
The Volume Summary page for the selected array is displayed.
The Controller Summary page is displayed.
A confirmation dialog box is displayed.