It is not permissible to failover a messaging engine using a file store onto a WebSphere® Application Server Version 6 server. If you have a cluster as a bus member that consists of a mixture of Version 6 and Version 6.1 servers, you must modify the high availability policy to prevent this.
To prevent failover of a Version 6.1 messaging engine to a Version 6 server, the high availability policy for the messaging engine should be modified so that the cluster is effectively divided into sets of servers at the different versions and the messaging engine is restricted to the servers at Version 6.1.
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