IJ45880: FIX 100% CPU UTILIZATION EVEN FOR IDLE WINDOWS CLIENTS.

APAR status

• Closed as program error.

Error description

• A GPFS Windows node that has been running for a few hours, may
  enter a state where-in even under no load, the idle GPFS threads
   might spin causing 100% CPU utilization. This is because of a
  potential error in time management and computation on Windows.
  

Local fix

• A possible work-around is to bounce GPFS on the Windows node
  (mmshutdown followed by mmstartup).
  

Problem summary

• A GPFS Windows node that has been running for a few hours, may
  enter a state where-in even under no load, the idle GPFS threads
  might spin causing 100% CPU utilization. This is because of a
  potential error in time management and computation on Windows.
  

Problem conclusion

• This problem is fixed in 5.1.7.1
  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:
  Prevent 100% CPU utilization by GPFS threads even when there is
  no workload running against GPFS filesystems.
  
  Work Around:
  A possible work-around is to bounce GPFS on the Windows node
  (mmshutdown followed by mmstartup).
  
  Problem trigger:
  GPFS must be up and running on a Windows node for a few hours.
  
  Symptom:
  Performance Impact/Degradation.
  
  Platforms affected:
  Windows/x86_64 only.
  
  Functional Area affected:
  Windows performance.
  
  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:

  IJ46270

Fix information

• Fixed component name

  SPEC SCALE STD

• Fixed component ID

  5737F33AP

Applicable component levels