5. MVS messages and codes

The MVS operating system issues messages from the base control program components, the job entry subsystems (JES2 and JES3), the Data Facility Product (DFP), system products, and application programs running under the system. The system issues messages in different ways and to different locations:

  • Most messages are issued through WTO and WTOR macros to one of the following locations:

    - Console

    - Hard-copy log

    - Job log

    - SYSOUT data set

  • Other messages are issued through the WTL macro or the LOG operator command to the system log (SYSLOG).

  • Dump messages are issued through the dumping services routines and can appear in:

    - SVC dumps, stand-alone dumps, or SYSMDUMP ABEND dumps formatted by the interactive problem control system ...

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