RAC Node Pinning & Unpinning

sam1374:CADP3>olsnodes -n -t -s

sam1372      1       Active  Unpinned

sam1373      2       Active  Unpinned

sam1374      3       Active  Unpinned

sam1374:CADP3>

There is so much we learn every day. One of such is leanred today is pinning and unpinning of RAC node.

Pinning a node means that the association of a node name with a node number is fixed. If a node is not pinned, its node number may change if the lease expires while it is down. The lease of a pinned node never expires.

This concept is active since version 11.2. When we do fresh installtion Clusterware do it for us. For the clusterware which are upgraded from lower version, can be pinned by :  crsctl pin css -n node3 node4

I'm still in phase to understand advantage/dis-advantage of pinning and unpinning the node.