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.
On 12/24/2016 1:43 PM, H wrote:> 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.thats really hard to do because the noise source is diffused, and reaches your ears via multiple paths, plus your ears aren't at a fixed location. Its easier to move the servers to somewhere you won't hear them, like a server closet that you can soundproof and add forced ventilation to. or wear earplugs. -- john r pierce, recycling bits in santa cruz
On 24/12/16 04:43 PM, H wrote:> 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.There are rack chassis designed to reduce noise. An example are the APC NetShelter CS line. http://www.apc.com/shop/ca/en/categories/racks-and-accessories/racks-and-enclosures/netshelter-cx/_/N-1ks6cn2 I don't know of any other way to make servers quieter, though. -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education?
On 12/24/2016 1:57 PM, Digimer wrote:> There are rack chassis designed to reduce noise. An example are the APC > NetShelter CS line. > > http://www.apc.com/shop/ca/en/categories/racks-and-accessories/racks-and-enclosures/netshelter-cx/_/N-1ks6cn2wow, $9100 for the 38U rack. thats pricey... and that's before PDUs, UPS, and all that other important rack mount stuff. -- john r pierce, recycling bits in santa cruz
Quoting Digimer <lists at alteeve.ca>:> On 24/12/16 04:43 PM, H wrote: >> 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. > > There are rack chassis designed to reduce noise. An example are the APC > NetShelter CS line. > > http://www.apc.com/shop/ca/en/categories/racks-and-accessories/racks-and-enclosures/netshelter-cx/_/N-1ks6cn2 > > I don't know of any other way to make servers quieter, though.noise cancelling headphones?> > -- > Digimer > Papers and Projects: https://alteeve.ca/w/ > What if the cure for cancer is trapped in the mind of a person without > access to education? > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos >-- "As long as politics is the shadow cast on society by big business, the attenuation of the shadow will not change the substance." -- John Dewey
On 12/24/2016 03:43 PM, H wrote:> 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. >}} 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. see: http://www.rotron.com/techcorner/acoustic.aspx http://ipnpr.jpl.nasa.gov/progress_report2/42-56/56O.PDF -- The important thing is not to stop questioning. - Albert Einstein CentOS GNU/Linux 6.8 KDE 4.3.4 peace out. tc,hago. g . =+Tired of having your microsoft os hacked? Change to Linux os, used by microsoft hackers. =+If Bill Gates got a dime for every time Windows crashes... ...oh, wait. He does. THAT explains it! =+in a world with out fences, who needs gates. =+=
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
Google "server room active noise cancellation" On 12/24/2016 03:43 PM, H wrote:> 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. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos >-- -- Steve
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. -- Ciao, luigi / +--[Luigi Rosa]-- \ When you become obsessed with the enemy, you become the enemy. --Jeffrey Sinclair, "Infection", Babylon 5
On 12/25/2016 09:45 PM, Luigi Rosa wrote: <<>>> 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. >}} not totally true. there is a very easy way to change fix to variable speed. BTDT. -- The important thing is not to stop questioning. - Albert Einstein CentOS GNU/Linux 6.8 KDE 4.3.4 peace out. tc,hago. g . =+Tired of having your microsoft os hacked? Change to Linux os, used by microsoft hackers. =+If Bill Gates got a dime for every time Windows crashes... ...oh, wait. He does. THAT explains it! =+in a world with out fences, who needs gates. =+ -- The important thing is not to stop questioning. - Albert Einstein CentOS GNU/Linux 6.8 KDE 4.3.4 peace out. tc,hago. g . =+Tired of having your microsoft os hacked? Change to Linux os, used by microsoft hackers. =+If Bill Gates got a dime for every time Windows crashes... ...oh, wait. He does. THAT explains it! =+in a world with out fences, who needs gates. =+=
On December 24, 2016 4:50:58 PM EST, John R Pierce <pierce at hogranch.com> wrote:>On 12/24/2016 1:43 PM, H wrote: >> 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. > >thats really hard to do because the noise source is diffused, and >reaches your ears via multiple paths, plus your ears aren't at a fixed >location. > >Its easier to move the servers to somewhere you won't hear them, like a > >server closet that you can soundproof and add forced ventilation to. >or wear earplugs. > > > >-- >john r pierce, recycling bits in santa cruz > >_______________________________________________ >CentOS mailing list >CentOS at centos.org >https://lists.centos.org/mailman/listinfo/centosInteresting. In my case i wanted to decrease the amount of noise escaping through an open door (which can not be closed.) After reading the various comments i think I might search for acoustic blankets for musicians.