z/OS MVS JCL Reference
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REGION parameter

z/OS MVS JCL Reference

Parameter type

Keyword, optional


Use the REGION parameter to specify the amount of central or virtual storage that the step requires.

The amount of storage that you request must include the following:
  • Storage for all programs in the step to execute.
  • All additional storage that the programs in the step request with GETMAIN, STORAGE, and CPOOL macro instructions.
  • Enough unallocated storage for task initialization and termination. Task initialization and termination can issue GETMAIN macro instructions for storage in the user's address space.

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 "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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