Configuring messaging engine failover for mixed version clusters
A messaging engine that is hosted on a WebSphere® Application Server Version 7.0 or later server cannot fail over to a messaging engine that is hosted on a WebSphere Application Server Version 6 server. If you have a cluster bus member that consists of a mixture of Version 6 and Version 7.0 or later servers, you must make sure the high availability policy is configured to prevent this type of failover.
About this task
To prevent failover of a Version 7.0 or later messaging engine to a Version 6 server, configure the high availability policy for the messaging engine so that the cluster is effectively divided into one set of servers for Version 6 and another set of servers for Version 7.0 or later, and the Version 7.0 or later messaging engine is restricted to the servers at Version 7.0 or later.