IJ31927: GPFS DAEMON FAILS WITH ASSERT: !COMMITRANGES[I].VALID || COMMITRANGES[I].NUMBYTES <= LFP->SGP->GETWRITECACHETHRESHOLD()

APAR status

• Closed as program error.

Error description

• GPFS daemon could fail unexpectedly
  with assert: commitRanges[i].valid ||
  commitRanges[i].numBytes <=
  lfP->sgP->getWriteCacheThreshold().  This could happen
  after mmchfs command was issued to reduce
  write cache threshold while applications
  are actively writing to the file system.
  

Local fix

• Don't reduce write cache threshold while
  there is write workload on the file system.
  

Problem summary

• GPFS daemon could fail unexpectedly
  with assert: commitRanges[i].valid ||
  commitRanges[i].numBytes <=
  lfP->sgP->getWriteCacheThreshold().  This could happen
  after mmchfs command was issued to reduce
  write cache threshold while applications
  are actively writing to the file system.
  

Problem conclusion

• Benefits of the solution:
  Prevent unexpected GPFS daemon assert
  after reducing the write cache threshold on a file
  system with mmchfs command.
  
  Work Around:
  Don't reduce write cache threshold while
  there is write workload on the file system.
  
  Problem trigger:
  Reducing the  write cache threshold using mmchfs command
  
  Symptom:
  Abend/Crash
  
  Platforms affected:
  ALL Operating System environments
  
  Functional Area affected:
  HAWC
  
  Customer Impact:
  Critical
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  SPEC SCALE STD

• Fixed component ID

  5737F33AP

Applicable component levels