IJ36862: DEADLOCK POSSIBILITY WHEN AFM SPLIT READS ARE HAPPENING AND FILESET GOES SICK DUE TO A REMOTE ERROR

APAR status

• Closed as program error.

Error description

• When split reads are spawned out to helper gateway nodes
  and there is a remote error at the home site causing the
  fileset to be evasively put to unmounted state - there is
  a window where putting the fileset to unmounted can
  conflict with an ongoing split read message.
  

Local fix

Problem summary

• When split reads are spawned out to helper gateway nodes
  and there is a remote error at the home site causing the
  fileset to be evasively put to unmounted state - there is
  a window where putting the fileset to unmounted can
  conflict with an ongoing split read message.
  

Problem conclusion

• This problem is fixed in 5.0.5  PTF 12
  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:
  Avoiding deadlocks safely on the helper gateway node
  when split reads are given to them, and the remote site
  doesn't respond mandating the need for this AFM
  relationship to be put to unmounted state.
  
  Work around:
  None
  
  Problem trigger:
  AFM fileset having to move to unmounted state when there
  are split reads in progress on the helper gateway node.
  
  Symptom:
  Deadlock
  
  Platforms affected:
  ALL Linux OS environments
  
  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