PM84205: CHKW DOES NOT WORK CORRECTLY WHEN BSN WRAP IN TWO BYTES

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CHKW does not work correctly on BSN wrap cases.
  Case-1: Low bound=FFFDxxxx  High bound=0002xxxx CHKW
  Count=FFFExxxx This is a valid CHKW, DFSFLLG0 handle this as NOP
  
  Case-2: Low bound=FFFDxxxx  High bound=0002xxxx  CHKW
  Count=FFFCxxxx
    This is the case that CHKW issued with old count, and this
  should be handled as NOP. But DFSFLLG0 build CHKW AWE.
  
  
  Case-3: Low bound=FFFDxxxx  High bound=0002xxxx  CHKW
  Count=0003xxxx
    This is wrong CHKW count case and should be handled as NOP.
    But DFSFLLG0 build CHKW AWE.
  
  This is an error in DFSFLLG0 after label LLCH0010.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All V13 IMS users                            *
  ****************************************************************
  * PROBLEM DESCRIPTION: Some committed log data may be lost     *
  *                      after abnormal termination              *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  The checkwrite process in DFSFLLG0 made inaccurate decisions
  on whether log data was already hardened or not.  This could
  result in data not being written to the WADS when it should
  have been.
  

Problem conclusion

• GEN:
  KEYWORDS:
  
  *** END IMS KEYWORDS ***
  Procedure LLCHECK in DFSFLLG0 has been corrected.  Null
  checkwrite tokens are now treated as if they refer to the
  latest assigned log space and the commitment decision is
  now made correctly when the low 16 bits of the last BSN
  written to the OLDS is higher than the low 16 bits of
  the latest assigned BSN.
  

Temporary fix

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

Comments

APAR Information

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

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

  UK92914

Modules/Macros

•    DFSFLLG0
  

Fix information

• Fixed component name

  IMS V13

• Fixed component ID

  5635A0400

Applicable component levels

• R300 PSY UK92914

     UP13/04/02 P F304 Ž

Fix is available

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