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What is the impact of disabling or enabling Microsoft ODX "Copy offload"?

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Applies to

  • ONTAP 9
  • CIFS
  • ODX

Answer

  • It is non-disruptive.  Existing CIFS sessions are not impacted.
  • Once ODX is disabled, the impact is that ODX is disabled for all future sessions.
    • Like other CIFS options, the ODX portion is negotiated in tree connect & it remains with the session until it disconnects
    • Hence, disabling ODX does not impact existing sessions, but new sessions will not see the option to do it & will no longer use ODX
  • If ODX is already disabled, enabling ODX is also non-impactful.  It will only be enabled on new CIFS sessions.

Additional Information

NetApp Docs: Improving Microsoft remote copy performance.

  • Lab test observation & results:

ODX_1.png

  • This is how it is tested: Started a copy using ODX
  • Then we set this ...
    • Cluster1::> cifs options modify -vserver <vserver_name> -is-copy-offload-direct-copy-enabled false
  • It is verified the copy is still using ODX.

 

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