SYSTEM parameter

Parameter type

Keyword, optional

Purpose

Indicates the systems that are eligible to process the job. The parameter indicates the system affinity represented by a system name. Up to 32 system names can be coded on the SYSTEM parameter, limited by the number of JES systems that can exist in a JESplex. A minus character (-) preceding the first system name in a list indicates that none of the systems listed are eligible for processing the job. For JES2, the default systems for a job are set via SYSAFF values that are associated with the input device. For JES3, the default system is the processor used for the job's class.

Considerations for a JES3 environment

The following parameters must be consistent with the SYSTEM or SYSAFF parameter, or JES3 will terminate the job:

For the CLASS parameter on the JOB or //*MAIN statement, the requested processor must be assigned to execute jobs in the specified class.
All devices specified on DD statement UNIT parameters must be available to the requested processor.
The TYPE parameter on the //*MAIN statement must specify the system running on the requested processor.
Dynamic support programs requested on //*PROCESS statements must be able to be executed on the requested processor.
If any DD statement UNIT parameter in the job specifies a device-number, either a SYSTEM or SYSAFF parameter must be coded or the JES3 //*MAIN statement must contain a SYSTEM parameter.