IJ54782: MISSING MMAP WRITES

APAR status

• Closed as program error.

Error description

• When accessing a mmaped file concurrently, even from internal
  GPFS operations like restripe, the required flush of the mmap
  data can be incomplete, resulting in data from previous mmap
  writes not to be written to disk.
  

Local fix

• No workaround.
  

Problem summary

• When accessing a mmaped file concurrently, even from internal
  GPFS operations like restripe, the required flush of the mmap
  data can be incomplete, resulting in data from previous mmap
  writes not to be written to disk.
  

Problem conclusion

• This problem is fixed in 5.1.9.10
  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:
  The mmap flush is implemented properly and the flush of the data
  to disk is not skipped.
  
  Work around:
  No workaround.
  
  Problem trigger:
  Have a file mmaped for writing, write data to the mmap region
  and then trigger some concurrent access (e.g. mmrestripefs)
  
  Symptom:
  Data corruption
  
  Platforms affected:
  ALL Linux OS environments
  
  Functional Area affected:
  All Scale Users
  
  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