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z/OS MVS JCL Reference
Use the REGION parameter to specify the amount of central or virtual storage that the job requires. The system applies the value that you code on REGION to each step of the job.
The amount of storage requested must include the following:
Two installation exits, IEFUSI and IEALIMIT, can also affect the size of the user address space assigned to the job step.
For more information on address space size, see z/OS MVS Initialization and Tuning Guide, and "Resource Control of Address Space" in z/OS MVS JCL User's Guide. For more information on region size with checkpoint/restart jobs, see z/OS DFSMSdfp Checkpoint/Restart.
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