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A cluster is a group of Communications Server instances that work together as one logical entity. Each Communications Server instance in the cluster has the same configuration and the same applications deployed to it. Horizontal scaling is achieved by adding Communications Server instances to a cluster, thereby increasing the capacity of the system. It is possible to add Communications Server instances to a cluster without disrupting service. The HTTP, RMI/IIOP, and JMS load balancing systems distribute requests to healthy Communications Server instances in the cluster.
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