Normal operations in a sysplex

Once the complex is built, it requires little, if any, operator intervention. If a problem occurs, either global resource serialization or some other system component will detect the problem and issue messages that describe it before the operator could notice it.

For example, some of the error messages that global resource serialization issues indicate damage to resources or to the resource control blocks. These messages are ISG031E, ISG032E, ISG033E, ISG034E and ISG035E. The problem that causes any of these messages can also cause the job requesting the resource to terminate abnormally. If the damage is extensive, the problem can cause multiple jobs to terminate abnormally, requiring you to reIPL to restore the control blocks.

During normal processing, operators can use system commands to monitor and control global resource serialization. The system commands related to global resource serialization are:

DISPLAY GRS, which displays the status of each system in the complex. For more information see Displaying the status of systems in a star complex.
SET GRSRNL, which changes the RNLs dynamically. For more information see Changing RNLs for a star complex.
SETGRS, which is used to migrate systems in an active ring sysplex to a star sysplex. You can alter the values specified in GRSCNFxx parmlib member by using the SETGRS command. For more information about using the SETGRS command, see Using the SETGRS command to convert to a star complex.
VARY XCF,sysname,OFFLINE, which removes a system from the complex (and also the global resource serialization star complex). For more information, see z/OS MVS Setting Up a Sysplex.

Note: The VARY GRS command is not supported in a star complex. If the command is entered, it will be rejected with message ISG153I.