Subparameter definition

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 rounds 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 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 is set to NOLIMIT.
Note: This might cause storage problems. See the Considerations When Using the REGION parameter section for more information.