7.10. Dump data set size

When the z/OS operating system initiates, or is instructed to dump an address space, or multiple address spaces, the data will be written to a dump data set on a disk device. These data sets can be pre-allocated, as is the case with the traditional SYS1.DUMPxx data sets, or dynamically allocated, in which case a new data set will be allocated whenever the system requests a dump.

In conjunction with the dump data set, the user defined MAXSPACE parameter must be set to ensure sufficient memory is allocated to retain the dump information in use by the address spaces and system areas. The recommended MAXSPACE in today’s environment is 2500Mb, which is a lot different than the IBM default of 450Mb. This will need to be increased ...

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