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What is Change Notify and why is there a high packet trace response time?

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Category:
ontap-9
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nas
Last Updated:

Applies to

  • Any SMB client and storage
  • All versions of ONTAP or Data ONTAP

Answer

  • The response time is the delta between watched folder changes, but it is not required to per SMB spec so the updates only happen when a change actually occurs
  • Change Notify is a function of CIFS/SMB which sends any folder updates to the client
    • Example: If two users have the same folder open, and one users deletes a file, a change notify update is sent to the second user of the deleted file
    • This saves client CPU cycles because the user doesn't have to refresh the whole folder if a large one, just the changes
  • Change Notify only updates when the folder being monitored (for example when Windows Explorer is open on a share) has a file update

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