A cluster is a logical collection of application server processes that are grouped together solely for the purpose of providing workload distribution and failover. Servers which are members of a cluster must all have identical application components deployed on them.
The servers that are members of a cluster can be on located on the same host computer and node, which is called vertical clustering, or on different host computers and nodes, which is called horizontal clustering.
A cluster is not the same as a cell. A WebSphere Application Server Network Deployment cell can have zero clusters, one cluster, or multiple clusters.
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