[CentOS] Noise Cancellation of Server Noise
John R Pierce
pierce at hogranch.com
Sun Dec 25 04:25:50 UTC 2016
On 12/24/2016 5:24 PM, geo.inbox.ignored wrote:
> temperature regulated fan speed can reduce noise.
>
> use of a baffle box with styrofoam or thin foam rubber lining.
>
> -----+-----+
> fan \/ | |
> /\ | |
> --+-----+---
> ^ ^
> baffles
>
> spacing between upper and lower baffles must be equal to or larger
> than diameter of fan so as to not restrict flow. also, making
> enclosure 2" larger than fan will help reduce restriction.
he said 'server rack'. thats a probably 6' tall cabinet filled with
servers, each of which has likely dozens of high speed fans.
(back of 2 server cabinets I used to run at work...)
https://photos.smugmug.com/By-Date/2015/2015-01-31/n-vn7hn/i-QFKg46V/0/X3/i-QFKg46V-X3.jpg
(front of one of those cabinets,
https://photos.smugmug.com/By-Date/2015/2015-01-31/n-vn7hn/i-cJs8Dkk/1/X3/i-cJs8Dkk-X3.jpg
a cabinet like that needs 600 cubic feet/minute or more airflow.
now, I'm guessing that H's rack isn't quite this big, or as densely
populated, since its not in a dedicated server room, but still, it has a
lot more than a couple fans to silence. my rack there has 8 servers, 2
additional disk trays, and about 200 disk drives, also a pair of 7000 VA
UPS's in the bottom (actual load was around 3000VA)
--
john r pierce, recycling bits in santa cruz
More information about the CentOS
mailing list