Ensure that when you format the primary and alternate couple data sets used by the XCF component of MVS™:
Each XCF group is limited to 2047 members, which is therefore the theoretical maximum number of CICS regions that can participate in XCF/MRO in a single sysplex. However, the maximum size of the XCF group is reduced if you set the MVS MAXMEMBER parameter, used to define XCF couple data sets, to a lower limit. When calculating the maximum number of members in the CICS XCF group, allow one member for:
To list the members in the CICS XCF group, you can use the MVS DISPLAY command. The name of the CICS group is always DFHIR000, so you could use the MVS command:
DISPLAY XCF,GROUP,DFHIR000,ALL