Global resource serialization matches the name specified on the SYSNAME system parameter at IPL time to a name specified on MATCHSYS to locate the information in GRSCNFxx for a particular system. Each system name must be unique within the complex. It is a good practice to use the same four-character name for MATCHSYS that you use to identify the system to SMF, that is, the same value you specify for the SMF SID parameter. Consistent use of the same system name makes identifying the system in various records and messages easier and provides a consistent identifier for the operators.

The syntax of the MATCHSYS parameter in GRSCNFxx allows you to specify MATCHSYS(*). Global resource serialization considers MATCHSYS(*) to be a match to any SYSNAME value. If an operator enters an erroneous value for SYSNAME, global resource serialization sees MATCHSYS(*) as a match and might build the complex incorrectly. To avoid this problem, identify each system explicitly by name in GRSCNFxx.