IJ54425: RESTRICT THE NUMBER OF MOUNT REQUESTS FROM GATEWAY NODE TO NFS SERVER

APAR status

• Closed as program error.

Error description

• Today when a Gateway node fails and comes back up, there will a
  recovery attempt on almost all filesets that the Gateway node
  used to handle. Although the number of recoveries has been
  capped using the afmMaxParallelRecoveries tunable, there's still
  chance that all filesets attempt mount first flooding the
  gateway node with mount requests..
  

Local fix

• Keep all filesets stopped and start only
  afmMaxParallelRecoveries number of filesets per gateway at a
  time.
  

Problem summary

• Today when a Gateway node fails and comes back up, there will a
  recovery attempt on almost all filesets that the Gateway node
  used to handle. Although the number of recoveries has been
  capped using the afmMaxParallelRecoveries tunable, there's still
  chance that all filesets attempt mount first flooding the
  gateway node with mount requests..
  

Problem conclusion

• This problem is fixed in 5.1.9.10
  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:
  Restricted number of mounts on par with afmMaxParallelRecoveries
  will be attempted.
  
  Work Around:
  Keep all filesets stopped and start only
  afmMaxParallelRecoveries number of filesets per gateway at a
  time.
  
  Problem trigger:
  Starting replication on many filesets belonging to the same
  Gateway node at the sametime.
  
  Symptom:
  Unexpected behavior
  
  Platforms affected:
  Linux Only
  
  Functional Area affected:
  AFM
  
  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