One Process Commander system can be supported by more than one node, forming a cluster. The term horizontal cluster means that multiple application servers are deployed on separate physical servers.

For example, a three-node Process Commander system can consist of three instances of IBM's WebSphere application server, running on three separate servers. These form a horizontal cluster, providing throughput and high availability.

Horizontal clustering can be used in combination with vertical clustering, which involves multiple Process Commander installations on one hardware server.

	cluster, vertical cluster
	Clusters (multiple-node systems) — Concepts and terms

Definitions — H