There is a presentation out on the web from the Oxford 2007 Symposium about
TSM dedup.  From reading it, I'm sure just how useful it will be.  It only
supports FILE devices (files are re-duplicated when written to tape) and
duplicate blocks are not removed until reclamation (you don't get the
benefit for a long time).  I also do not see an option for compression on
top of the dedup like a VTL or dedup appliance provides.

http://adsm-symposium.oucs.ox.ac.uk/2007/papers/Dave%20Cannon%20-%20Data%20Deduplication.pdf

Good reading!

Rick


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