Physical questions

Danny Harrison dannyh at
Tue Jan 14 16:56:14 PST 2003

RackSaver has deployed over 100 Dual Xeon 2.4GHz - 2.8GHz clusters in
the last 4 months alone, each with 66 nodes. We have several 88 node
clusters (single rack) running the same systems. Check out the news
section (press release).

I guess you can call us a 'thermal' company.

Look at to get a better idea of the designs.


RackSaver, Inc.
San Diego, Ca. 

-----Original Message-----
From: beowulf-admin at [mailto:beowulf-admin at] On
Behalf Of Robert G. Brown
Sent: Tuesday, January 14, 2003 3:20 PM
To: Michael Stein
Cc: beowulf at
Subject: Re: Physical questions

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...:-)



Robert G. Brown	             
Duke University Dept. of Physics, Box 90305
Durham, N.C. 27708-0305
Phone: 1-919-660-2567  Fax: 919-660-2525     email:rgb at

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