IJ51787: OPTIMIZE HANDLING OF SECURITY CONTEXTS TO ELIMINATE UNNECESSARY RESOURCE UTILIZATION

APAR status

• Closed as program error.

Error description

• When a large number of secure connections are created at the
  same time between the mmfsd daemon instances in a Scale cluster,
  some of the secure connections may fail as a result of
  timeouts,resulting in unstable cluster operations.
  

Local fix

• Stage the rebooting of nodes in large Scale clusters such that
  they don't reboot at the same time.
  

Problem summary

• When a large number of secure connections are created at the
  same time between the mmfsd daemon instances in a Scale cluster,
  some of the secure connections may fail as a result of
  timeouts,resulting in unstable cluster operations.
  

Problem conclusion

• This problem is fixed in 5.1.9.5
  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:
  By optimizing the use of security contexts by the mmfsd daemon,
  the number of secure connections between mmfsd daemon instances
  that can be established concurrently increases
  substantially,allowing all necessary secure connections to be
  successfully established.  This is particularly beneficial for
  cases where a large Scale cluster's node are rebooted at the
  same time and all mmfsddaemon instances running on the cluster
  nodes attempt to create secure connections with each other at
  the same time.
  
  Work Around:
  Stage the rebooting of nodes in large Scale clusters such that
  they don't reboot at the same time.
  
  Problem trigger:
  Rebooting all nodes of a large Scale cluster at the same time.
  
  Symptom:
  Unexpected Results/Behavior
  
  Platforms affected:
  ALL
  
  Functional Area affected:
  GPFS Core
  
  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