Workload balancing in a sysplex

In an MVS/ESA sysplex, you can create a CICS®plex consisting of sets of functionally-equivalent CICS terminal-owning regions (TORs) and application-owning regions (AORs). If the FEPI back-end system is a TOR in such a CICSplex, you can use the VTAM® generic resource function to perform workload balancing across the available TORs.

A VTAM application program such as CICS can be known to VTAM by a generic resource name, as well as by the specific network name defined on its VTAM APPL definition statement. A number of CICS regions can use the same generic resource name.

A FEPI application, wishing to start a session with a CICSplex that has several terminal-owning regions, names a target that you have defined as the generic resource name of the TORs. Using the generic resource name, VTAM is able to select one of the CICS TORs to be the target for that session. For this mechanism to operate, the TORs must all register to VTAM under the same generic resource name. VTAM is able to perform dynamic workload balancing of the terminal sessions across the available terminal-owning regions.

For information about defining FEPI targets as VTAM generic resource names, see the APPLLIST option of the FEPI INSTALL TARGETLIST system programming command. For further information about VTAM generic resources, see the CICS Intercommunication Guide and the VTAM Version 4 Release 2 Release Guide.

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