Each server can be a member of only one cluster. To provide high availability, there must be at least two servers defined for a cluster.
If you are not using partitions, add a new machine to a cluster by changing the host in each listener to the Internet host name or IP address. Then, connect the Management Console to the cluster’s primary server and synchronize the cluster—see Chapter 7, “Exporting Server Modules.”
Do not use localhost listeners in clusters
Servers running in a cluster cannot have “localhost” IIOP
listeners. The sole exception is a cluster where all servers in
the cluster run on one machine. In this case, all IIOP listeners must
use the same host name, which can be either “localhost” or
the machine name.
