[CentOS] Noise Cancellation of Server Noise

Mon Dec 26 15:30:37 UTC 2016
Valeri Galtsev <galtsev at kicp.uchicago.edu>

On Mon, December 26, 2016 12:31 am, John R Pierce wrote:
> On 12/25/2016 10:22 PM, geo.inbox.ignored wrote:
>> there is a very easy way to change fix to variable speed. BTDT.
> in a rack server with arrays of fans in hotswap sliders inside the
> server that plug directly into the power distribution board?
> example:
> https://photos.smugmug.com/By-Date/2012/2012-02-09/i-vKQf8K5/1/X2/IMG_0322-X2.jpg
> pray tell how thats 'very easy' ?   that particular server has 14
> internal fans (there's another row of 7 beneath the ones visible)

The worst part in the approach "make rackmount machines quieter" is: these
machines are designed with high density of power per physical space and
efficient cooling in mind (as computers do not produce mechanical work,
hence virtually all consumed power goes into heat). Noise level is never
considered as a goal. So, attempting to make rackmount machine quieter is
counter productive.

Just my $0.02


> --
> john r pierce, recycling bits in santa cruz
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247