Each server can be a member of only one cluster. To provide high availability, there should be at least two name servers defined for a cluster.
Servers are defined by URL, rather than by server name. Every server in a cluster can have the same name. If you are not using partitioning, it is easy to add a new machine to a cluster; simply change the host in each listener to the Internet host name or IP address. Then, connect EAServer Manager to the cluster’s primary server and synchronize the cluster.
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 localhost or the machine name.
A name server can be used by one or more clusters. See “Adding a name server to a cluster” for restrictions before you assign a name server to more than one cluster.
All servers in a cluster should share a common account that will be used for inter-server connections when synchronizing the cluster. This must be a jagadmin account or an account for a user that has the Admin role.
If the servers in a cluster do not share a common account, you can synchronize the cluster only on a server-by-server basis.
