The disk owner is used in failover processes, where if one controller goes down, it addresses the failure by allowing the other controller to take ownership of the disks and continue service. During s...The disk owner is used in failover processes, where if one controller goes down, it addresses the failure by allowing the other controller to take ownership of the disks and continue service. During system maintenance, if a controller needs to be shut down, transferring the ownership of the disks it owns to another controller maintains data access throughout the maintenance period.