IJ36895: FREE BUFFERS DEPLETED EVEN AFTER INCREASING PAGEPOOL SIZE.

APAR status

• Closed as program error.

Error description

• In a Spectrum Scale Cluster and Spectrum Protect workload
  we hit the assert "The assert subroutine failed:
   !"More than 22 minutes searching for a free buffer in
   the pagepool", file
  ../../../../../../../src/avs/fs/mmfs/ts/bufmgr/bufmgr.C,
  line 668".
   Increasing pagepool size does not fix the issue and
   furthermore after a period of time  'NonStealable'
  buffers are depleted and we hit the assert again.
  

Local fix

Problem summary

• In a Spectrum Scale Cluster and Spectrum Protect workload
   we hit the assert "The assert subroutine failed:
   !"More than 22 minutes searching for a free buffer in
   the pagepool", file
  ../../../../../../../src/avs/fs/mmfs/ts/bufmgr/bufmgr.C,
  line 668".
   Increasing pagepool size does not fix the issue and
   furthermore after a period of time  'NonStealable'
  buffers are depleted and we hit the assert again.
  

Problem conclusion

• This problem is fixed in 5.1.2  PTF 2
  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:
  Fixed this memory leak issue
  
  Work Around:
  Change 'scatterBufferSize' config to a smaller size
  
  Problem trigger:
  This problem is more likely to occur in a
  cluster which has file systems with both
  large block size and small block size
  (compared to scatter buffer size)
  
  Symptom:
  Abend/Long Waiters
  
  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