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.
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