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Coupling Facility

   Also found in: Wikipedia 0.32 sec.

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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The Coupling Facility acts like a distributed lock manager that manages the access to blocks of data held in systems' local caches.
Crossing The ESCON/SAN Border? by Farley, Marc / Computer Technology Review
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Coupling facility LPARs using ICs can simultaneously use external coupling links or ISBs.
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