A cluster that is currently fencing out (ejecting) a node from the cluster prevents a new node from joining the cluster until the fencing operation is completed. The following are example messages that appear on the console for the new node:
...VxFEN ERROR V-11-1-25 ... Unable to join running cluster since cluster is currently fencing a node out of the cluster.
If you see these messages when the new node is booting, the vxfen startup script on the node makes up to five attempts to join the cluster.