z/OS MVS JCL Reference
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Subparameter definition

z/OS MVS JCL Reference
SA23-1385-00

valueK
Specifies the required storage in kilobytes (1 kilobyte = 1024 bytes). The value is 1 through 7 decimal numbers, from 1 through 2096128. Code a multiple of 4. For example, code REGION=68K. If the value you code is not a multiple of 4, the system will round it up to the next multiple of 4.
valueM
Specifies the required storage in megabytes (1 megabyte = 1024 kilobytes). The value is 1 through 4 decimal numbers, from 1 through 2047. For example, REGION=3M.
value=0M or 0K
A value equal to 0K or 0M gives the step all the storage available below the 2 GB bar. This includes below and above 16 megabytes. The resulting size of the region below and above 16 megabytes depends on system options and what system software is installed. When REGION=0K/0M is specified, the MEMLIMIT value is set to NOLIMIT.
Note: This may cause storage problems. See the Considerations When Using the REGION parameter section for more information.

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