To join a new appliance to an existing appliance cluster:
Log in to the Appliance Administration console using the root account at https://hostname:9443.
Click Cluster.
Specify the DNS hostname or IP address of the remote appliance to which you are clustering.
Specify root as the username and enter the password for the root user on the remoteappliance.
Click Join Cluster.
When clustering is complete, the Cluster Status displays a list of all nodes in the cluster with a status of "Ready." The process takes 5-15 minutes to complete.