COUPLExx (cross-system coupling facility (XCF) parameters)

The cross-system coupling facility (XCF) provides the MVS™ coupling services that allow authorized programs on MVS systems in a multisystem environment to communicate (send and receive data) with programs on the same MVS system or other MVS systems. The cross-system extended services (XES) allow authorized programs on MVS to use a coupling facility to share data with other programs on the same MVS system or other MVS systems. The eventual goal for the coupling services provided by XCF and XES is to allow an installation to view multiple MVS systems as one MVS system.

For more information about using XCF, see z/OS MVS Setting Up a Sysplex.

You must specify a COUPLExx parmlib member for each system in the sysplex. Use the COUPLExx member of SYS1.PARMLIB to specify the following installation values for this system in your sysplex:
  • The sysplex name
  • The names of the sysplex couple data sets
  • The names of other types of couple data sets
  • The failure detection interval
  • The operator notification interval
  • The cleanup interval
  • The default message buffer space
  • The default message size for a signalling path
  • The transport classes
  • The outbound signalling paths
  • The inbound signalling paths
  • The default retry limit
  • The local message buffer space
  • XCF CTRACE parmlib member
  • XES CTRACE parmlib member
  • CPUID toleration indicator for VM guest systems
  • Initial status of optional XCF/XES functions
  • Thresholds for converting synchronous coupling facility (CF) requests to run asynchronously
Parent topic: Members of SYS1.PARMLIB