Address Processing Parameters

The ASID and CPU parameters are address processing parameters that are part of the data description parameter. The data description parameter is used to describe storage in a dump. The ASID and CPU parameters are null until you specify a dump data set. When you specify a dump and access it with a dump analysis subcommand, that subcommand sets the ASID and CPU parameters to describe an address space contained in that dump.

If possible, IPCS sets the ASID parameter to the address space identifier associated with the problem that caused the dump. However, it might not always be possible to do so, as in the following cases:

When a dump is initiated through an operator command, a stand-alone dump program, or a similar external mechanism, IPCS might not be able to identify the address space associated with the failure.
When there is truncation during recording or I/O errors during transcription, data needed to establish an appropriate default address space might not be present in a dump data set.

In such circumstances, IPCS attempts to select a usable address space from which analysis can proceed, although the address space selected might not be one in which a failure occurred.

If the dump is a stand-alone dump and if a store status operation was performed, the CPU parameter is set to the IPLed central processor number. Otherwise, the CPU parameter is set to another processor in the configuration or NOCPU is used.

SETDEF rejects any attempt to set these parameters before you specify a dump.

See z/OS MVS IPCS Commands for more information about the data description parameter and address processing parameters.