PI42865: ABENDU0776 DFS0414I RC42 READ ERROR, ROLB IN DL/I BATCH LOG WHICH HAS TAKEN MULTIPLE EXTENTS.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Customer DL/I Batch job which issues ROLBs peridically gets
  U0776 following read error on DASD log IEFRDER.
  DFS0414I PERMANENT I/O ERROR ON IEFRDER DURING LOG READ 42
  The problem is that the first time a ROLB is issued the DCB
  to read the log is built and opened, and the desired block(s)
  are read. The application continues and writes many more log
  records, causing the log to take an extent, and then issues
  another ROLB, causing a log read request to be made to
  a block within the latest extent.
  The read DCB is never closed and re-opened, so is not aware of
  the new extent. As a result the read for a block in the new
  extent is posted with x'42', which is an extent issue.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS V13 users with batch jobs that       *
  *                 specify BKO=Y                                *
  ****************************************************************
  * PROBLEM DESCRIPTION: An IMS batch job receives DFS0414I for  *
  *                      log read with post code 42              *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  An IMS batch job may receive
  DFS0414I PERMANENT I/O ERROR ON IEFRDER  - DURING LOG READ 42
  on the second or later request to back out work with a ROLB
  or similar request.
  
  IMS did not take into account that DCBs opened for log input
  can only be used to access extents in existence when the DCB
  was opened.  If such a DCB is opened to process a ROLB request
  and then a second ROLB is issued after the log has added
  extents, attempts to read from the new extents will fail with a
  post code of 42.
  

Problem conclusion

• GEN:
  KEYWORDS:
  
  *** END IMS KEYWORDS ***
  The log read process has been changed so that the first response
  to a post code of 42 will be to close and re-open the DCB, on
  the theory that the extent information needs to be rebuilt.
  
  The read DCB open procedure and the volume positioning code
  in DFSFDLG0 have been converted into externally available
  subroutines so that IO error handling in DFSFDLB0 can use
  common code for this purpose.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PI40692

• APAR is sysrouted TO one or more of the following:

  UI29529

Modules/Macros

• DFSFDLB0 DFSFDLG0 DFSFDLS0 LCDSECT
  

Fix information

• Fixed component name

  IMS V13

• Fixed component ID

  5635A0400

Applicable component levels

• R300 PSY UI29529

     UP15/07/22 P F507 Ž

Fix is available

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