IJ34391: RUNNING ONLINE FSCK IN REPAIR MODE (-O -Y) CAN LEAD TO DUPLICATE BLOCK CORRUPTIONS.

APAR status

• Closed as program error.

Error description

• Running online fsck in repair mode (-o -y) can cause it to
  detect and repair false positive lost blocks
  (i.e. blocks that are assigned to files) and mark it as free,
  and doing this can lead to duplicate block corruptions.
  

Local fix

• Use offline fsck to fix corruptions.
  

Problem summary

• Running online fsck in repair mode (-o -y) can cause it to
  detect and repair false positive lost blocks
  (i.e. blocks that are assigned to files) and mark it as free,
  and doing this can lead to duplicate block corruptions.
  

Problem conclusion

• This problem is fixed in 5.0.5  PTF 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:
  Will not be able to run online fsck in repair
  mode (-o -y) in turn preventing this issue.
  
  Work around:
  Use offline fsck to fix corruptions.
  
  Problem trigger:
  Running online fsck in repair mode (-o -y)
  
  Symptom:
  Data corruption due to duplicate blocks.
  
  Platforms affected:
  ALL Operating System environments
  
  Functional Area affected:
  Online FSCK
  
  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