Applies to ONTAP 9 Controller upgrade Issue While performing a controller upgrade disk reassign -s node2_sysid -d node4_sysid -p node3_sysID fails: disk reassign: partner-system-id is required only in...Applies to ONTAP 9 Controller upgrade Issue While performing a controller upgrade disk reassign -s node2_sysid -d node4_sysid -p node3_sysID fails: disk reassign: partner-system-id is required only in maintenance mode when shared disks are present.