IJ50323: ON RUNNING MMFSCKX REPAIR THE NODES WILL HIT LOGASSERTFAILED: NBADALLOCSECTORS == 0

APAR status

• Closed as program error.

Error description

• When checking the block alloc map mmfsckx excludes the regions
  that are being checked or are already checked from further
  getting updated in the internal shadow map.But when checking for
  such excluded regions it was not checking which poolId the
  region belonged to. This resulted in mmfsckx not updating the
  shadow map for a region belongingto a pool while checking the
  block alloc map for the same region belonging to a different
  pool. This led to mmfsckx falsely marking blocks as lost block
  and then later to this assert.
  

Local fix

• Run offline mmfsck to fix corruptions
  

Problem summary

• When checking the block alloc map mmfsckx excludes the regions
  that are being checked or are already checked from further
  getting updated in the internal shadow map.But when checking for
   such excluded regions it was not checking which poolId the
  region belonged to. This resulted in mmfsckx not updating the
  shadow map for a region belongingto a pool while checking the
  block alloc map for the same region belonging to a different
  pool. This led to mmfsckx falsely marking blocks as lost block
  and then later to this assert.
  

Problem conclusion

• This problem is fixed in 5.1.9.3
  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 hit this assert on running mmfsckx reapir
  
  Work Around:
  Run offline mmfsck to fix corruptions
  
  Problem trigger:
  Run mmfsckx with --repair
  
  Symptom:
  Node assert
  
  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