Physical questions
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Robert G. Brown rgb at phy.duke.eduTue Jan 14 15:19:42 PST 2003
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On Tue, 14 Jan 2003, Michael Stein wrote: > > High density clusters also carry a fire risk of their very own. One can > > easily achieve node densities that consume 2 or 3 thousand watts in a > > rack (and with effort, can maybe double that). > > I've seen a dual 2.4 GHz Xeon Intel 1U machine measured at 250 W (multiple > "burn*" running). A rack full of these (42 U) really is 10KW. Has anyone actually filled a rack with nodes this hot and burned this much power, per node, sustained? Kind of scary, if you have;-) A joule is dropping a one kilogram hammer on your finger from 10 cm. So 10KW is a one-metric-ton jackhammer, pounding up and down one meter once a second, sustained. With all the cooling fans running, it probably sounds like one as well...:-) Ouch! rgb -- Robert G. Brown http://www.phy.duke.edu/~rgb/ Duke University Dept. of Physics, Box 90305 Durham, N.C. 27708-0305 Phone: 1-919-660-2567 Fax: 919-660-2525 email:rgb at phy.duke.edu
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