This section gives information on considerations for migrating high availability (HA) clusters.
To update an HA cluster, plan the order of migration
so that a system running WebSphere MQ Version 5.3 code can never access the
files for a queue manager that is already running with Version 6.0 code. Implementing
this rolling migration strategy to minimize total downtime will probably require
you to disable failover between some systems in the cluster during the upgrade
process.
Because channels are objects in WebSphere® MQ Version 6.0, the channels and clntconn directories must be replicated between nodes for channel definitions. (The client channel table file is unchanged.)
On Windows® HA systems, the certificate stores must be migrated to GSKit on all nodes which host a WebSphere MQ Version 6.0 queue manager.