In JBoss clusters, ensure that each application server in the cluster has the following:
A unique partition name (partition name)
A unique partition UDP (partition.udpGroup)
A unique Workflow Engine ID
The same (identical) WAR file. The WAR is written by the installation to the jboss\server\IDM\deploy directory by default.
In WebSphere clusters, ensure that each application server in the cluster has a unique Workflow Engine ID.
For more information, see the section on Clustering in Chapter 4 of the Identity Manager User Application: Administration Guide