Each V-Series LUN (or netapp disk) is assigned ownership to either node A or B. ON failover, the partner node picks up the partner disks. SO B can see As disks and on failover it will run an instance of A until giveback.
Both controllers need to see all the disks... can you confirm with "sysconfig -r" and see if there are disks with a "PARTNER" designation? Also, does "disk show -v" show all disks (the local and partner) and storage show disk -p with show pathing.