The IBM mainframes, a Cross-system Coupling Facility, or XCF, exists as a component of z/OS that handles communications between applications in a sysplex.
A sysplex can be either basic or parallel. A basic sysplex can communicate utilizing channel-to-channel (CTC) relationships between LPARs. Parallel Sysplex utilizes something named a Coupling Facility (CF).
IBM® Parallel Sysplex allows you to run multiple replicas of a z/OS as a single image, so you can control multiple systems and resources from a single point of control. In a Parallel Sysplex, operating systems can span multiple systems and transfer their applications and data.
All Parallel Sysplexes should contain at least two CFs and those CFs should be available to every member of the sysplex. z/OS needs a dataset (and an alternate dataset exists suggested for availability) to be transmitted by all methods in the Parallel Sysplex.
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