IJ51150: MMFSCKX WILL REPORT AND/OR REPAIR FALSE POSITIVE LOST BLOCKS, BAD (INCORRECTLY ALLOCATED) BLOCKS, DUPLICATE BLOCKS

APAR status

• Closed as program error.

Error description

• mmfsckx captures allocation and deallocation information of
  blocks from remote client nodes or non-participating nodes that
  mount the file system while mmfsckx is running. And once the
  file system gets unmounted from these nodes it stops the capture
  of such information. But due to an issue mmfsckx was stopping
  the capture of such information before the complete unmount
  event ended and that led to mmfsckx then reporting and/or
  repairing false positive lost blocks, bad (incorrectly
  allocated) blocks, duplicate blocks.
  

Local fix

• Run offline mmfsck
  

Problem summary

• mmfsckx captures allocation and deallocation information of
  blocks from remote client nodes or non-participating nodes that
  mount the file system while mmfsckx is running. And once the
  file system gets unmounted from these nodes it stops the capture
  of such information. But due to an issue mmfsckx was stopping
  the capture of such information before the complete unmount
  event ended and that led to mmfsckx then reporting and/or
  repairing false positive lost blocks, bad (incorrectly
  allocated) blocks, duplicate blocks.
  

Problem conclusion

• This problem is fixed in 5.1.9.4
  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:mmfsckx will not detect
  and/or repair false positive lost blocks, bad (incorrectly
  allocated) blocks, duplicate blocks
  
  Work Around:
  Run offline mmfsck
  
  Problem trigger:
  File system is unmounted on remote client or non-participating
  nodes while mmfsckx is running
  
  Symptom:
  False positive corrections by mmfsckx
  
  Platforms affected:
  ALL Operating System environments
  
  Functional Area affected:
  mmfsckx
  
  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