A cluster is a set of application servers that you manage together as a way to balance workload.
A cluster enables you to manage a group of application servers as a single unit, and distribute client requests among the application servers that are members of the cluster.
To create a cluster:
If you create a cluster member by converting an existing application server that is a member of a bus, you must migrate the messaging engine in the server to the scope of a cluster. To do this, use the wsadmin command migrateServerMEtoCluster. Do not delete the messaging engine at server scope and recreate it a cluster scope, because those actions prevent the messaging engine from working with previously configured destinations.
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