gtpm6m19Main Supervisor Reference

System Maintenance

TPF provides both offline and online segments to collect, edit, and print hardware error and trace data. The online segments:

The restart program activates AMX2 during a cycle-down of the system. AMX2 scans the SON file status tables to locate the online disk packs. AMX2 reads the environmental data from the buffer of these packs. All of this information is passed to segment CYSA. CYSA initializes these closing log entries and passes control to CYSM. CYSM logs the data to a real-time log tape. CYSM also logs device error records for DASD.

The 37x5 communications controller is a programmable control unit. It performs the line handling and processing functions in a communications network. The network control program (NCP) regulates operation of the 37x5.

The offline segments:

The Environmental Recording, Editing and Printing (EREP) Postprocessor

Operating under MVS control, the EREP interface postprocessor uses the real-time log tape to create 2 distinct output files; work tapes, and history tapes. All TPF device errors are written to work tapes. All other device errors are written to history tapes. History tapes are compatible with the format of the EREP accumulation input data set (ACCIN). See Environmental Record Editing and Printing Program (EREP) User's Guide and Environmental Record Editing and Printing Program (EREP) Reference for more information about this data format.

To activate EREP follow the procedure listed below. The job control language (JCL) statements referred to in the text are listed in EREP Job Control Language.

  1. Startup the system with the bypass label processing (BLP) function.
  2. Prepare and input the JCL.
  3. Mount the TPF real-time tape (//INTAPE in the JCL) on the drive specified by MVS.
  4. Mount the output history tape (//HISTORY in the JCL) on the tape drive specified by MVS.
  5. Mount the work tape (//WORKOUT in the JCL) on the drive specified by MVS.

Processing Device Error Statistics

This program itemizes the hardware error messages sent to the CRAS console. It provides varying levels of error message summaries by device type, device address, and the time period under operator control. The error message listing and summaries are used to locate system hardware problems. The EREP generated work tapes are the input to this program. The EREP output (the work tape) is sorted beforehand using the MVS sort/merge utility program. This program is often referred to as the device error statistics postprocessor. Device Error Statistics Postprocessor JCL, lists the JCL statements used to start the program.

Follow this procedure to activate the postprocessor:

  1. Prepare and input the JCL
  2. Mount the work tape on the drive specified by MVS.

Recording 37x5 Native Subchannel Errors

A subchannel is part of the channel data path; a piece of hardware. This program records the pertinent data associated with 37x5 native subchannel errors. This data aids in locating the source of such errors. This program also increments the error counter in the 3705 keypoint record -- CEPR. Error data is written to the real-time log tape, reformatted by program AMX1, and ultimately processed by EREP.

Display 37x5 Native Subchannel Error Counts

This program processes ZNERR commands. ZNERR is issued to display and/or reset (to zero) the 37x5 native subchannel error counters. There is one counter per control unit. In addition, this program checks the error totals maintained in the 3705 keypoint record. SNA support must be generated in the system to activate this program.