Use the crsctl unpin css command to unpin many servers. If a node is not pinned, its node number may change if the lease expires while it is down.
You can specify a space-delimited list of nodes.
Unpinned servers that stop for longer than a week are no longer reported by olsnodes. These servers are dynamic when they leave the cluster, so you do not need to explicitly remove them from the cluster.
Deleting a node with the crsctl delete node command implicitly unpins the node.
During upgrade of Oracle Clusterware, all servers are pinned, whereas after a fresh installation of Oracle Clusterware 12c, all servers you add to the cluster are unpinned.
You cannot unpin a server that has an instance of Oracle RAC that is older than 12c release 1 (12.1) if you installed Oracle Clusterware 12c on that server.