IJ49649: UNEXPECTED GPFS DAEMON ASSERT: ASSERT EXP(NPREFETCHEDBUFFERS > 0)

APAR status

• Closed as program error.

Error description

• GPFS daemon could fail unexpectedly with assert:  Assert
  exp(nPrefetchedBuffers > 0).   This could happen when DIO is
  used to append to a file.
  

Local fix

• Set dioReentryThreshold configuration variable to 2
  

Problem summary

• GPFS daemon could fail unexpectedly with assert:  Assert
  exp(nPrefetchedBuffers > 0).   This could happen when DIO is
  used to append to a file.
  

Problem conclusion

• This problem is fixed in 5.1.2.15
  To see all Spectrum Scale APARs and their respective
  Fix solutions refer to page:
  https://public.dhe.ibm.com/storage/spectrumscale/spectrum_scale_
  apars.html
  
  Benefits of the solution:
  Prevent unexpected GPFS daemon assert.
  
  Work Around:
  Set dioReentryThreshold configuration variable to 2
  
  Problem trigger:
  Append to a file using DIO.
  
  Symptom:
  Abend/Crash
  
  Platforms affected:
  ALL Operating System environments
  
  Functional Area affected:
  All Scale Users
  
  Customer Impact:
  High Importance
  

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