Fail Over a Controller
Failover requires one controller to be in Active mode and the other controller to be in Standby mode.
A failover switches management of the array from the active controller to the standby controller.
While you can manually perform a failover,
a failover can also be system driven. For example, in an iSCSI array, a failover can
occur when the standby controller has better connectivity. In a Fibre Channel array,
a failover will occur when the active controller loses all connectivity.
NOTE: A failover will not start
automatically until connectivity to the array is lost for ~6 seconds.
You must perform a failover during a controller upgrade or when directed by support.