As explained in previous chapters, clusters enable several Oracle WebLogic Server instances to work together as if they were one and the same.
WebLogic Server clusters can replicate information across instances so that cluster members are enabled to handle any incoming request, irrespective of whether the request initiates a session, or is part of an existing session, including sessions initiated in other WebLogic Server instances. This replication is required to support failover, which shields applications from failure of individual instances. ...
