The GRSRNL=00 system parameter specifies the GRSRNL00 parmlib member.

There are several ways to specify the GRSRNL system parameter; GRSRNL=00, GRSRNL=(xx,yy...) or GRSRNL=EXCLUDE.

Use the GRSRNL=00 system parameter when you can use the default RNLs in the GRSRNL00 parmlib member for global resource serialization in the complex.

The GRSRNL=(xx,yy...) system parameter specifies the GRSRNLxx parmlib member(s) that consist of the resource name lists (RNLs) used in the complex to control the serialization of resources.

Use GRSRNL=(xx,yy...) when you have an existing global resource serialization complex, are adding the system to a sysplex, and want to use the existing RNLs in the complex.

GRSRNL=EXCLUDE indicates that all global enqueues are to be treated as local enqueues. All ENQ macro requests are excluded from global serialization and are serialized locally; except that all resources identified on an ENQ SCOPE=SYSTEMS,RNL=NO macro are globally serialized on all systems in the complex.

Use GRSRNL=EXCLUDE when you do not have an existing global resource serialization complex, are adding the system to a sysplex, and want the serialization of most resources done with the RESERVE macro.

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