For ESX to see the space savings you do have to have NFS
(along with a lot of other nice features)
The dedupication part of it not so much so ... you just have to come back and over-provision on the flexvol side ... not elagent but do-able.
I dont know what else to say I have posted the papers on how to do it, and that it does work its not really my job to convince sales of reality.
I would talk to them again if just to make sure there is no misunderstanding but the origional poster needed the information already posted
To him I hope I answered your question, look at the PDF posted to see some of your configuration options on the LUN so you can gain the most benifit from it.
Jered Rassier
##If you have found my post has answered your question or helpful please mark it as such##