I work for Rocket Software / Arkivio and we have just such a product.  Utilizes 
FPolicy for NetApp and CFM for Celerra to do Tag (Stub) migration on each for 
both CIFS and NFS, along with most any other source platform that presents CIFS 
or NFS volumes to the network.  Can migrate to (virtually) any target platform 
(CIFS / NFS / tape / optical).  Take a look at arkivio.com for more info, or 
just ask me.

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