If you're using a newer version of clustered Data ONTAP, SMB 3, and a compatible version of Windows, then it will use ODX to transfer data...this works SMB3-to-SMB3, LUN-to-LUN and LUN-to-SMB3 (or vice-versa). Some more info is available here.
Be sure to give the "File Access and Protocols Management Guide" for your Data ONTAP version a read just to ensure you understand what the requirements are and what's going on with your data. For 8.2 there is a section titled "Improving Microsoft Remote Copy Performance" which specifically addresses ODX.
Hope that helps.
Andrew
If this post resolved your issue, please help others by selecting ACCEPT AS SOLUTION or adding a KUDO.