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JES3 to JES2 Migration Considerations by Tom Wasik, John Unterholzner, John A. O'Leary, Brad Habbershaw, Bruce Dennis, Karan Singh, Frank Kyne

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Workload Manager considerations
This chapter stresses Workload Manager (WLM) enhancements that complement or interact with JES2 or JES3 classical batch jobs handling. Among other things, it also speaks that from OS/390 V2R4 on, initiator can now be managed by WLM and no longer by the job entry subsystem (whether JES2 or JES3).
Indeed, WLM introduced in 1994, for handling workloads in parallel sysplex environments, was enhanced in 1997 (OS/390 V2R4) for managing resources “a la JES3”, at the sysplex scale.
Indeed, through this enhancement, WLM started ...

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