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Does FlexCache automatically perform write-back

  1. Last updated
    May 19, 2025
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Category:
ontap-9
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nas
Last Updated:
5/19/2025, 6:58:28 AM

Applies to

  • ONTAP 9.15.1 and later
  • FlexCache
  • NFS

Answer

  • Yes, it does.
  • NFSv4.x (Stateful Protocol): Approximately 40MB of dirty data in the cache is flushed to the origin storage when the file is closed.
  • NFSv3 (Stateless Protocol): Approximately 40MB of dirty data in the cache is flushed to the origin storage when:
    • Another cache requests access to the file, or
    • The file has been idle for more than 2 minutes (up to a maximum of 5 minutes).
  • Scrubber Trigger Frontend Operations:
    • SETATTR (modifying only mtime, atime, and/or ctime can be processed at the cache)
    • CLOSE
    • OPEN at another cache
    • READ at another cache
    • READDIR at another cache
    • READDIRPLUS at another cache
    • WRITE at another cache

Additional Information

 

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