when you provision a LUN for a Cluster, usually you create an igroup which contains the FC or iSCSI address of the HBAs from all the Cluster nodes. When you provision the LUN and select the appropriate igroup, you'll select the LUN ID, which will be the same for all cluster nodes in this way.
saranraj456, I recommend using the same LUN ID for the same LUN to all hosts in the cluster.
This will prevent confusion and mistakes later. Use the LUN ID as a unique identifier for those hosts to that storage system.
If you end up with the same LUN having multiple IDs across different hosts in the same cluster, you could cause future administrators some major headaches, particularly during DR or failover situations.