Planning the GRSCNF system parameter

The GRSCNF=xx system parameter specifies the GRSCNFxx parmlib member that describes the global resource serialization complex for the initializing system.

Use GRSCNF=00 (the default) when all systems in the sysplex are in the global resource serialization ring complex and you can use the values in the default GRSCNF00 parmlib member to provide control information about the complex. With GRSCNF00, all global resource serialization communication is through XCF services.

Note: If GRSCNF00 is used to initialize a star complex, only the MATCHSYS and CTRACE parameters have meaning. The presence of other ring-related parameters is “tolerated”. An informational message is issued and the parameters are ignored other than for syntax checking.

Use GRSCNF=xx when you have a global resource serialization mixed complex (one or more systems in the complex are not part of a sysplex) and need to provide control and configuration information consistent with the complex. There is no requirement for a GRSCNFxx parmlib member to initialize a star complex, unless you are using a CTRACE parmlib member other than the default, CTIGRS00, shipped by IBM®.

See z/OS MVS Planning: Global Resource Serialization for planning information for the GRSCNF system parameter and the GRSCNF parmlib member.