IJ51149: MMFSCKX WILL REPORT AND/OR REPAIR FALSE POSITIVE INCONSISTENCIESFOR COMPRESSED FILES.

APAR status

• Closed as program error.

Error description

• Due to an issue with the way mmfsckx scans compressed files and
  internally stores information to detect if it has inconsistent
  compressed groups, mmfsckx will report and/or repair false
  positive inconsistencies for compressed files.
  The mmfsckx output will report something like below for
  example:
  !Inode 791488 snap 6 fset 6 "user file" indirect block 1 level 1
  @4:13508288: disk address (ditto) in slot 0 replica 0 pointing
  to data block 226 code 2012 is invalid
  

Local fix

• Run offline mmfsck
  

Problem summary

• Due to an issue with the way mmfsckx scans compressed files and
  internally stores information to detect if it has inconsistent
  compressed groups, mmfsckx will report and/or repair false
  positive inconsistencies for compressed files.
  The mmfsckx output will report something like below for example:
  !Inode 791488 snap 6 fset 6 "user file" indirect block 1 level 1
  @4:13508288: disk address (ditto) in slot 0 replica 0 pointing
  to data block 226 code 2012 is invalid
  

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 or repair false positive inconsistencies
  for compressed files.
  
  Work Around:
  Run offline mmfsck
  
  Problem trigger:
  mmfsckx run on file system having compressed files
  
  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