Thanks a lot Perry. I really appreciate your help.

If possible, I want to make all the disks available on all three nodes and introduce the affinity rule so that one instance running on node B and node c never fails over to node A. I also like your idea of masking the disks. Which one you suggest ?

Actually my requirement is to setup 4 node cluster with instance 1 to run on node A and node B. Instance 2 runnig on node B and node C. Instance3 running on node D and node B.