[CentOS] Noise Cancellation of Server Noise

Mon Dec 26 03:45:05 UTC 2016
Luigi Rosa <lists at luigirosa.com>

H wrote on 24/12/2016 22:43:
> Has anyone come across a device that could cancel out the noise from servers, ie. the fan noise? I have  a server rack near my office and would like to see if i can decrease the noise level. It would seem to me that the steady drone of the fans could be cancelled out to a large extent.

It's probably too late for you, but the best solution is to buy office-grade 
servers instead of datacentre-grade servers

HP and Dell (don't know othjer brands so well) have two kinds of servers: 
"dense" rack-only servers (tipically 1U or 2U if we are talking about single 
servers and not Apollo or VRTX or blade) and "office type" servers, 4U to 6U.

Let's put aside Apollo, VRTX, and other blade, they are out of scope.

Dnese servers are extremely noisy because they have a lot of small fans turning 
relatively at high speed. This kind of server cannot be converted to free 
standing "tower" form factor.

The other kind of server is sold both in "tower" and rack form factor; they are 
bigger the airflow is forced by bigger fans that can turn to a lower speed to 
exchange the heat.

If the noise is produced by the rack fans, use, as someone else suggested, 
variable speed fans regulated by a temperature sensor.

In essence, you can greatly lower the noise "by design", but if you already have 
the equipment it can be too late.



+--[Luigi Rosa]--

When you become obsessed with the enemy, you become the enemy.
     --Jeffrey Sinclair, "Infection", Babylon 5