Edit: Note there is revised math in the comments section.
Well, the bloggers at NetApp have been threatening to introduce deduplication for their VTL for a while now, so it should come as no surprise that they finally did it. And just like that, they have assumed the unenviable position of being the last major vendor to announce a dedup product for backup.
(Just a quick role call here: EMC. Check. HP. Yep. IBM. You bet. Sun. Check. Dell. Roger that. Data Domain. Naturally. Sepaton. Yes. Falconstor. Yes. So NetApp, welcome, at last, to the game.)
Naturally, I had a lot of questions when I heard the announcement. Would it do replication? Is it a variable or fixed block scheme? In-line or post-process? How does it protect the hash index? And, most importantly of all, did NetApp decide to stick with VTL RAID rather than moving to RAID DP?
The last question is really the most crucial.