An Enterprise Server Cluster is composed of a minimum of two Enterprise Server Cluster clients and a single Enterprise Server Cluster lock manager - the GLM. In practice, the number of Enterprise Server Cluster clients is determined by the volume of JES work required - jobs can be submitted to any members of a cluster.
If desired, an Enterprise Server Cluster can present a single interface for job submission. Jobs can be submitted to a specialized instance of a cluster member - a scheduler region, which can itself execute JES work as well as orchestrate it. It is also possible for the GLM to act as a scheduler region - but we strongly advise (although do not enforce) that no work other than global locks processing is executed by the GLM. For example, it is inadvisable to create initiators on the GLM machine.
Current limitations: