Installations that use a coupling facility need data for capacity planning and for tuning. RMF™ provides this type of information for each coupling facility attached to the sysplex. The data gathered can be used to monitor how effectively the coupling facility is being utilized and to indicate possible performance constraints in a sysplex environment. See z/OS RMF User's Guide for a description of the RMF Coupling Facility Activity Report.

The IXLMG macro is the mechanism by which authorized routines can collect information from individual systems and from coupling facilities. The programs that use IXLMG may be, but are not required to be, connectors to a structure in the coupling facility. The information provided by the IXLMG macro is mapped by the IXLYAMDA macro.