IJ36532: ROUTINE WAS NOT UPDATED TO USE FAST BUFFER SCAN

APAR status

• Closed as program error.

Error description

• Customer saw poor performance for a large data copy in
  NFS.
  The problem shows as a mutex contention issue.
  

Local fix

• A workaround to lower the impact would be to decrease the
  number of workerThreads.
  

Problem summary

• When there are multiple threads trying to flush the
  same file and the file is large with many blocks,
  there could be mutex contention which can lead
  to performance degradation.
  

Problem conclusion

• This problem is fixed in 5.1.2  PTF 3
  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:
  Improve performance
  
  Work Around:
  Reduce number of worker threads
  
  Problem trigger:
  Multiple threads trying to flush the same large file.
  
  Symptom:  Performance Impact/Degradation
  
  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