Handling Server and Service Failures
WebLogic Server can fail over most services transparently, but it's unable to do the same when dealing with pinned services. Services such as JMS and JTA are considered pinned services. They're hosted on individual members of a cluster and not on all server instances. You can have high availability only if the cluster can ensure that these pinned services are always running somewhere in the cluster. When a WebLogic Server instance hosting these critical pinned services fails, WebLogic Server can't support their continuous availability and uses migration instead of failover to ensure that they are always available. A whole server migration occurs automatically when a server hosting pinned services is migrated ...
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