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CIFS access to deeply nested folders is abnormally slow

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • ONTAP 9
  • CIFS
  • Windows client with security software installed

Issue

  • Accessing deeply nested directories using a Windows client takes a long time.
  • No performance anomalies can be detected through Perfarchive or Perfstat analysis.
  • The observed IOPS count significantly exceeds the actual access volume.
  • Packet trace analysis reveals that the client traverses every directory along the access path.

Example: in the trace below, when accessing a file within folder "11", the client attempts to retrieve information from all folders along the path — from folder "1" through to "11".

clipboard_eac5d670d4c518f3ad101a2035219dacb.png

Notes: The correct packet trace should look like this:

clipboard_e5406ad944285ddcf9662dc46b8e0eed2.png

 

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