IJ38849: AFMCOS: MD5SUM MISMATCH WITH OBJECTS IN COS

APAR status

• Closed as program error.

Error description

• Error Description:
  
  When AFMCOS fileset is configured with objectFS mode, and
   object is transparently downloaded on demand of read, it
   is possible that the object is left partially
  downloaded.
  
  Reported in:
  Spectrum Scale 5.1.1.4 on RHEL7
  
  Known Impact:
  Partially downloaded object
  
  Verification steps:
  Compare the md5sum of objects in cache and the ones in
  COS
  
  Recovery action:
  Evict the object and manually download the object using
  "mmafmcosctl download" command.
  

Local fix

• N/A
  

Problem summary

• Files are not fully cached on AFM COS filesets
  

Problem conclusion

• This problem is fixed in 5.1.3 PTF 1
  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:
  Fixed the code which is causing the unintentional read
  failures, this will help users to fully cache the files.
  
  Work around:
  Use AFM prefetch to cache the files again.
  
  Problem trigger:
  File read on AFM uncached files.
  
  Symptom:  Unexpected results
  
  Platforms affected: ALL Linux OS environments
  
  Functional Area affected:  AFM
  
  Customer Impact: HiPER
  

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 DME

• Fixed component ID

  5737F34AP

Applicable component levels