This Information Week article by Charlie Babcock sums it up nicely:
http://www.informationweek.com/shared/printableArticle.jhtml?articleID=19160
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Sun sells and supports the data warehouse appliance (we call it Thumper DW)
at prices between $15K and $20K per Terabyte. Off-the-shelf single rack
configurations include 10,40 and 100TB of net usable database storage with
scan rates up to 1 Terabyte per minute.
Thumper DW scales to 1,200 Terabytes (1.2 Petabytes) in twelve racks with a
scan rate of 12 Terabytes per minute.
- Luke