IJ53600: DISK I/O PERFORMANCE IMPROVEMENT

APAR status

• Closed as program error.

Error description

• A Linux kernel change caused GPFS to break disk I/O into many
  small requests.
  

Local fix

Problem summary

• A Linux kernel change caused GPFS to break disk I/O into many
  small requests.
  

Problem conclusion

• This problem is fixed in 5.2.2.1
  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:
  
  Increasing the size of the I/Os we queue to the block layer has
  shown performance improvements on some systems
  
  Work Around:
  None
  
  Problem trigger:
  N/A
  
  Symptom:
  Performance Impact/Degradation
  
  Platforms affected:
  ALL Linux OS environments with kernel version >= 5.1
  
  Functional Area affected:
  All Scale Users
  
  Customer Impact:
  Suggested
  

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