Coupling Facility


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Coupling Facility

The hardware and software that turns an IBM mainframe Base Sysplex system into a Parallel Sysplex. It is made up of special microcode built into the machine, and the CFCC operating system (Coupling Facility Control Code). It can be implemented as a stand-alone machine, in an LPAR logical partition or in a spare processor that becomes an Internal Coupling Facility (ICF).

The Coupling Facility allows up to 32 coupled systems to communicate using three coupling structures: "list" for simple data, "cache" for data buffering and "lock" for control of access to ensure data integrity. See Parallel Sysplex.
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1 of the coupling facility to be set up on the lot 1; of n.
ICF: Internal Coupling Facility--used for redirecting coupling facility cycles in a data sharing environment
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Protocol Transparency/Low Latency--Most DWDM systems support Fibre Channel, ESCON, ATM, FICON, GbE, SONET/SDH, Sysplex Coupling Facility timers, and video.
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S/390 systems are already very good at sharing data among themselves through the IBM's Parallel Sysplex Coupling Facility.
Copenhagen is the client in relation to the establishment of coupling facility.