IJ32581: INCREASED BLOCK USAGE WHEN DOING PREALLOCATION AND WRITES.

APAR status

• Closed as program error.

Error description

• When doing preallocation and writes
  (e.g., Spectrum Protect Plus copy restore), the block usage
  of the file system is bigger than the total data size of these
  files.
  

Local fix

• mmchattr --compact=fragment <filePath>
  

Problem summary

• When doing preallocation and writes
  (e.g., Spectrum Protect Plus copy restore), the block usage
  of the file system is bigger than the
  total data size of these files.
  

Problem conclusion

• Benefits of the solution:
  Correct block usage when doing preallocation and writes.
  
  Work around:
  mmchattr --compact=fragment <filePath>
  
  Problem trigger:
  Preallocate the data blocks of the file,
  and then write as much data as the file size.
  
  Symptom:
  More disk space usage than expected.
  
  Platforms affected:
  All Operating Systems
  
  Functional Area affected:
  Disk space preallocation of files.
  
  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:

  IJ32627

Fix information

• Fixed component name

  SPEC SCALE STD

• Fixed component ID

  5737F33AP

Applicable component levels