You can however you this to get an idea :
http://www-01.ibm.com/support/docview.wss?uid=swg21596944


On Tue, Mar 25, 2014 at 10:25 AM, Erwann Simon <erwann.simon AT free DOT fr> 
wrote:

> Hi Christian,
>
> No, it's not possible. the Storage Pool must be deduplication enabled to
> be able to run identify duplicates against it. If you enable your Storage
> Storage for deduplication, and start identify process, your DB will start
> to grown at a very fast rate and you won't be able this space after that.
>
> --
> Best regards / Cordialement / مع تحياتي
> Erwann SIMON
>
> ----- Mail original -----
> De: "Christian Svensson" <Christian.Svensson AT CRISTIE DOT SE>
> À: ADSM-L AT VM.MARIST DOT EDU
> Envoyé: Jeudi 13 Février 2014 09:42:34
> Objet: [ADSM-L] Test Deduplication
>
> Hi *SM-nerds.
> I just wonder if it is possible to run a deduplication Identify process on
> an existing File Class Storage Pool without deduplicat any data?
> We just want know how much data that will be deduplicate and if it worth
> it on this storage pool.
>
> We are running TSM 6.3.4.300 running on a Windows Server 2012.
> Best Regards / Med vänlig hälsning
> Christian Svensson
> __________________________
> Knarrarnäsgatan 7, Kista Entré
> SE-164 40 Kista Sweden
> Cell :+ 46-70 325 1577
> E-mail: Christian.Svensson AT cristie DOT se<mailto:Christian.Svensson AT 
> cristie DOT se
> >
> "Genom att säkra era data spar ni tid, tid som ni kan använda till
> viktigare saker."
>