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Recovery and diagnostic facilities

Extensive recovery and diagnostic facilities ensure that all Subzero components handle problems correctly and provide robust information about events and actions.

Subzero uses the following diagnostic and tracing facilities. For more information, see Troubleshooting.

Facility

Description

Processing log and diagnostic tracing

Subzero servers write messages to the processing log in response to:

  • Major events in the environment (such as established and lost connections and error conditions)
  • Internal and external commands

You can enable diagnostic tracing to obtain more detailed information.

The BRDPRINT data set (in the DBC address space) contains the processing log. The BRDTRACE and BRDSVLOG data sets (in the Subzero address space) contain diagnostic trace data.

Resource Managers

These facilitate any cleanup required in the event of catastrophic failures that preclude the abend recovery routines from taking action.

Note: The abend recovery routines ensure both local and remote address spaces (client, Subzero and subsystem) are properly notified of any task or address space terminations.

Abend recovery

The following abend recovery services produce an SVC dump and terminate cleanly with an error message or a condition code that is passed to another routine:

  • The Associated Recovery Routine (ARR) provides recovery services for cross-memory routines.
  • The Functional Recovery Routine (FRR) provides recovery services for SRB routines.
  • The Extended Specify Task Abnormal Exit (ESTAE) service provides recovery services for client and subsystem servers.

Related topic

Subzero-architecture


 

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