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IBM WAS ND V6 workload management optimizes the distribution of incoming requests between appservers that are able to handle a client request. WebSphere workload management is based on appserver clusters containing multiple appservers, so-called cluster members. An application deployed to a cluster runs on all cluster members concurrently. The workload is distributed based on weights that are assigned to each cluster member. Thus more powerful machines receive more requests than smaller systems.
Workload management (WLM) also takes care of failing over existing client requests to other, still available appservers and of directing new requests only to available processes should an appserver in the cluster fail. In addition, WLM enables servers to be transparently maintained and upgraded while applications remain available for users. You can add additional cluster members to a cluster at any point, providing scalability and performance if an existing environment is not able to handle the workload any more. For more details, see 2.3, WebSphere workload management defined.
