Big data doesn't fit in normal servers, and so HP's engineers have gone back to the whiteboards and designed a new line of hyperscale machines called the ProLiant SL4500s. Google designed its own servers not just because it has some serious motorheads in charge, but because the boxes available from the tier one server makers did …
You can't stack 9 of these oddball chassis in a standard rack as the tapped holes are spaced for integral multiples of 1U. Therefore you would need to use proprietary posts or cabinets, which I am sure HP will be happy to sell you at a princely markup.
Re: Rack positioning
Yeah, cos the cost of a rack is really going to blow the whole business case! I'm sure the extra density fair outweights a couple of grand on a new rack!
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