Sysplex overview

A sysplex consists of multiple MVS™ systems, coupled together by hardware elements and software services. In a sysplex, MVS provides a platform of basic multisystem services that multisystem applications like CICS® can exploit. As an installation’s workload grows, additional MVS systems can be added to the sysplex to enable the installation to meet the needs of the greater workload.

To use XCF to communicate in a sysplex, each CICS region joins an XCF group called DFHIR000 by invoking the MVS IXCJOIN macro using services that are provided by the DFHIRP module. The member name for each CICS region is always the CICS APPLID (NETNAME on the CONNECTION resource definition) used for MRO partners. Each CICS APPLID must be unique within any sysplex regardless of the MVS levels that are involved. Within the sysplex, CICS regions can communicate only with members of the CICS XCF group (DFHIR000).

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