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InIBM mainframes, aCross-system Coupling Facility, orXCF, is a component ofz/OS that manages communications between applications in asysplex.[1][2][3][4][5] Applications may be on the same system or different systems.
Systems communicate using messages transported by one of two mechanisms:
In a parallel sysplex decisions about which of these two transport mechanisms to use for routing a specific message are made dynamically.
Within a single z/OS system messages are transported using cross-memory services, rather than being routed through either of the physical transport mechanisms.
Applications join specificgroups as individualmembers. On joining a group a member can send or receive messages. Individual messages are assigned to specifictransport classes, based on the message's size. Each transport class owns input and outputbuffers. Routing decisions are made at the transport class level.
