Informally, a cluster is a collection of server computers that operate together to support an application.

In Process Commander terms, a multinode system is a cluster. Nodes supporting Process Commander are part of a system if they have the same system ID and share a PegaRULES database.

A cluster may have heterogeneous nodes in terms of hardware and operating system. For example, some nodes may use Microsoft Windows XP and Intel-based hardware, and others may use Solaris and Sun Microsystems hardware. (All nodes must use the same version of Process Commander.)

	horizontal cluster, node, passivation, system ID, vertical cluster
	Multinode clusters — Concepts and terms

Definitions — C