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
On 12/24/2016 10:25 PM, John R Pierce wrote: <>> he said 'server rack'. thats a probably 6' tall cabinet filled with > servers, each of which has likely dozens of high speed fans. >}} true. i was thinking 'old school' slide drawer racks. because i doubt that 'it' or 'heads of authority' will allow changes to server racks, H's best bet is to get 'fixed base' or 'roll around' type acoustic wall panels. they are available with various types of sound absorbing covering and of various heights and widths. one or two can be placed between him and area of rack to block/absorb sound. -- 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. =+=
Mark Woolfson (Notebook)
2016-Dec-25 17:53 UTC
[CentOS] Noise Cancellation of Server Noise
If the server decision makers had not gone for a server designed by accountants but a server designed by engineers then you would not have this problem. Regards, Mark Woolfson MW Consultancy Ltd Leeds United Kingdom Tel: +44 113 259 0759 Mob: +44 786 065 2778 -----Original Message----- From: geo.inbox.ignored Sent: Sunday, December 25, 2016 7:49 AM To: centos at centos.org Subject: Re: [CentOS] Noise Cancellation of Server Noise On 12/24/2016 10:25 PM, John R Pierce wrote: <>> he said 'server rack'. thats a probably 6' tall cabinet filled with > servers, each of which has likely dozens of high speed fans. >}} true. i was thinking 'old school' slide drawer racks. because i doubt that 'it' or 'heads of authority' will allow changes to server racks, H's best bet is to get 'fixed base' or 'roll around' type acoustic wall panels. they are available with various types of sound absorbing covering and of various heights and widths. one or two can be placed between him and area of rack to block/absorb sound. -- 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. =+_______________________________________________ CentOS mailing list CentOS at centos.org https://lists.centos.org/mailman/listinfo/centos
On December 25, 2016 2:49:25 AM EST, "geo.inbox.ignored" <geo.inbox.ignored at gmail.com> wrote:> > >On 12/24/2016 10:25 PM, John R Pierce wrote: ><> > >> he said 'server rack'. thats a probably 6' tall cabinet filled >with >> servers, each of which has likely dozens of high speed fans. >> >}} > >true. i was thinking 'old school' slide drawer racks. > >because i doubt that 'it' or 'heads of authority' will allow changes to >server racks, H's best bet is to get 'fixed base' or 'roll around' type >acoustic wall panels. they are available with various types of sound >absorbing covering and of various heights and widths. > >one or two can be placed between him and area of rack to block/absorb >sound. > > >-- > >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. >=+>_______________________________________________ >CentOS mailing list >CentOS at centos.org >https://lists.centos.org/mailman/listinfo/centosAcoustic wall panels that can be moved sounds interesting.