IJ54328: POTENTIAL FOR READING INCORRECT SNAPSHOT DATA DURING MMCHDISK START

APAR status

• Closed as program error.

Error description

• Incorrect snapshot dataeither stale or uninitializedmay be
  read while the mmchdisk start command is being executed on file
  systems with replication enabled.
  

Local fix

• Avoid accessing snapshot data while running the mmchdisk start
  command.
  

Problem summary

• Incorrect snapshot dataeither stale or uninitializedmay be
  read while the mmchdisk start command is being executed on file
  systems with replication enabled.
  

Problem conclusion

• This problem is fixed in 5.2.3.0
  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:
  Fix prevents incorrect snapshot data from being read while the
  mmchdisk start command is being executed.
  
  Work Around:
  Avoid accessing snapshot data while running the mmchdisk start
  command.
  
  Problem trigger:
  The issue may happen if some data replicas are stale or
  uninitialized, and snapshot data is accessed while  running the
  mmchdisk start command to repair the bad replicas.
  
  Symptom:
  Data corruption, snapshot data read may not be as expected.
  
  Platforms affected:
  All platforms
  
  Functional Area affected:
  GPFS core
  
  Customer Impact:
  Critical
  

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