On Apr 3, 2013, at 12:34 PM, Robert Hajime Lanning wrote:
> Last time I evaluated going with the high density chassis (both 4x1 and
> blades), I found that unless I went into a brand new data center that
> had enough power to light a city, I was limited to about 16 actual
> servers per rack. ("actual server" = 1 blade or 1 of 4 modules, but not
> 7 of 9...)
>
> The overall ROI (with vendor discounts) along with ease of maintenance
> in a lights out data center (and no geo local labor) pointed
> overwhelmingly at 1U single servers.
>
> This evaluation was done about 1.5 years ago.
I've been in datacenters like that: single circuit per rack, maybe 15-
or 20-amp, maybe even 110V. (I'm thinking of a particular one in Fremont
right now....)
I don't consider that kind of power density acceptable these days. Two
or three 30A circuits per rack (or the equivalent) are needed to make
sufficient use of available space. They're not hard to find.
--------------------------------------------------------------------
Leon Towns-von Stauber http://www.occam.com/leonvs/
"We have not come to save you, but you will not die in vain!"
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