Sysplex-wide subsystem inter-communication

Multiple IDIS subsystems in a sysplex interface with one another using the Cross-system Coupling Facility (XCF) to allow efficient sharing of subsystem-managed data, such as the caching of $$INDEX data.

The IDIS subsystem uses ISGQUERY GATHERFROM=SYSPLEX as part of its integrity and sharing strategy. Customers who use non-IBM enqueue management products should contact their vendor to discuss possible setup requirements to support this function.

Other than that, no special action is needed to use this feature. If XCF becomes unavailable, IDIS processing continues to perform all functions, although reduced performance might result.