[Beowulf] Quiet *and* powerful
alvin at Mail.Linux-Consulting.com
Fri Dec 12 12:54:09 EST 2003
hi ya joshua
- what makes noise is typiclly the qualityof the fan, the
fan blade design and the size of the air holes and
distance to the fans
- a fan held up in the open air shold be close to noiseless
- if you want 1U .. you have to put good quality lateral squirrel cages
far away from everything and still be able to force air
across the cpu heatsink fins
- you should not hear anything
- if you go to 12U or midtower... there is no noise problem
except for the cheezy "el cheapo" power supply fan
( get a good power supply w/ good fan and you wont hear
( the power supply either
- next choice isto use peltier cooling but you still have to cool
down the fin on the hot side of the peltier..
- you can also attach a bracket from teh cpu heatink
or peltier heatsink to the case ... to get rid of the heat
assuming the ambient room temp can pull heat off the case
- sounds like your app is based on "quiet operation" and does
not need to be 1Us ...
- i'd stack 6 dual-xons mb into one custom chassis and
it should be quiet as a "nursing room"
== to prove the point ...
- take all the fans off ( its not needed for this test )
- take off all the covers to the chassis
- arrange the motherboards all facing the same way
- put a giant 12" household fan blowing air across
the cpu heatink ( air flowing only in 1 direction )
- preferably side to side in the direction
of the cpu heatsink fins
- put a carboard box around the chassis and leave the
unobstructed air flow of the cardboard opn on the
cpu side and opposite site
- put white hospital linen on the box
that says "do not sit here"
( probably should do that with the doors locked so
( that nobody see the cardboard experiment
- after that, you know what your chassis looks like ...
and still be quiet .. or you're stuck with 6 mid-tower systems
vs noisy 1Us
- 2Us suffer the same noise fate as 1Us ( the way most people
build it )
- fun stuff .. making the system quiet and run cool ... temperature wise
On Fri, 12 Dec 2003, Nicholas Henke wrote:
> On Fri, 2003-12-12 at 12:08, Joshua Baker-LePain wrote:
> > Yes, I know this has been discussed a couple of times, and that my stated
> > goals are at odds with each other. But I really need the best bang for
> > the noise for a system that will reside in the same room with patients
> > undergoing diagnostic ultrasound scanning. Our current setup (6 1U dual
> > 2.4GHz Xeons, with about 11 little fans per node) is ridiculously loud,
> > and annoys both the patients and the physicians. This is Bad.
> > We're willing to pay for better, but don't want to take too much of a
> > speed hit. Does anybody have a good vendor for quiet but still high
> > performing systems? Is there any hope in the 1U form factor (my Opteron
> > nodes are somewhat quieter, since they use squirrel cage fans, but are
> > still too loud), or should I look at, e.g., putting Quad Opterons in a 3
> > or 4U case? Or should I look at lashing together some towers (this system
> > also needs to be somewhat portable)?
> They are not 1U, but the Dell 650N I have is just about silent. At most
> I hear a faint harddrive noise, but most times I hear nothing at all.
> FYI, this is a dual processor machine as well.
> Nicholas Henke
> Penguin Herder & Linux Cluster System Programmer
> Liniac Project - Univ. of Pennsylvania
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