Inline deduplication looks as a very impressive term. You are made to believe that the magic would happen on the wire but at the end of the day, there are many caveats.
We have had a very recent experience where someone sized it with assumptions and commitments of reducing the backup & recovery windows tremendously but it did not really go as down as it was expected to be going.
Inline deduplication starts working on the source server itself and is followed by some more processing on the network. The left overs are taken care of by the media device’s memory. So, if you think you have a lot of extra resources on the production servers, go for this. If you are low on resources, you should first upgrade the production servers and then you are expected to have atleast two 10 Gig ports dedicated for the deduplication device and a well sized media server.
Just expecting wonders by replacing the backup device would not help much. It will reduce the backup & recovery windows a bit especially if you move from tape to disk while getting deduplication. However, you should be extremely careful in terms of your upgrade plans and the expectations that you set for yourself.
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