Re: [CentOS] Noise Cancellation of Server Noise

[geo.inbox.ignored]

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@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] Noise Cancellation of Server Noise

[John R Pierce]

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

___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] apcupsd-3.14.14

[TE Dukes]

> -Original Message-
> From: CentOS [mailto:centos-boun...@centos.org] On Behalf Of John R
> Pierce
> Sent: Saturday, December 24, 2016 8:13 PM
> To: centos@centos.org
> Subject: Re: [CentOS] apcupsd-3.14.14
> 
> On 12/24/2016 5:02 PM, TE Dukes wrote:
> > I have an older Smart APC UPS. Replaced the batteries twice. It might
> > be time to upgrade. This has been broken for a while but batteries are
> > cheaper than replacing the whole unit.
> 
> if it only has the non-serial port serial port control signalling, where
CTS/RTS
> etc are used to signal the UPS, and requires a very specific APC
> "serial" cable, then I'd consider retiring it.I prefer my UPS's to
> have ethernet based power management
> 
Not using an APC cable, just USB. It doesn't have an Ethernet connection,
just USB and a serial port.

Its an APC Smart 750. Not looking for run time, but a safe shutdown.

It may be worth upgrading. Checked Newegg the other day and they have come
down in price big time.

About time for another battery change anyway.

___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] Noise Cancellation of Server Noise

[geo.inbox.ignored]

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.
=+=
___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] apcupsd-3.14.14

[John R Pierce]

On 12/24/2016 5:02 PM, TE Dukes wrote:

I have an older Smart APC UPS. Replaced the batteries twice. It might be
time to upgrade. This has been broken for a while but batteries are cheaper
than replacing the whole unit.


if it only has the non-serial port serial port control signalling, where 
CTS/RTS etc are used to signal the UPS, and requires a very specific APC 
"serial" cable, then I'd consider retiring it.I prefer my UPS's to 
have ethernet based power management



--
john r pierce, recycling bits in santa cruz

___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] apcupsd-3.14.14

[TE Dukes]

> -Original Message-
> From: CentOS [mailto:centos-boun...@centos.org] On Behalf Of John R
> Pierce
> Sent: Saturday, December 24, 2016 7:44 PM
> To: centos@centos.org
> Subject: Re: [CentOS] apcupsd-3.14.14
> 
> On 12/24/2016 4:33 PM, TE Dukes wrote:
> > Looking for a apcupsd 3.14.14 rpm.
> >
> > Been getting communication lost errors. I read there was a problem
> > with the
> > 3.14.12 version regarding a usb connection which I'm using, but has
> > been corrected in 3.14.14.
> >
> > I found a Fedora 25 Rawhide src version, but the link must be bad. Was
> > hoping I could rebuild it for Cento 6.
> >
> > Looks like apcupsd no longer producing the rpms.
> >
> > I could build one from the source but would prefer to use an rpm.
> 
> look into NUT, the Network UPS Tools.   much better way to manage UPS's,
> either on a single system or network-wide.

Thanks!!

I have an older Smart APC UPS. Replaced the batteries twice. It might be
time to upgrade. This has been broken for a while but batteries are cheaper
than replacing the whole unit.



___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] apcupsd-3.14.14

[John R Pierce]

On 12/24/2016 4:33 PM, TE Dukes wrote:

Looking for a apcupsd 3.14.14 rpm.

Been getting communication lost errors. I read there was a problem with the
3.14.12 version regarding a usb connection which I'm using, but has been
corrected in 3.14.14.

I found a Fedora 25 Rawhide src version, but the link must be bad. Was
hoping I could rebuild it for Cento 6.

Looks like apcupsd no longer producing the rpms.

I could build one from the source but would prefer to use an rpm.


look into NUT, the Network UPS Tools.   much better way to manage UPS's, 
either on a single system or network-wide.




--
john r pierce, recycling bits in santa cruz

___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

[CentOS] apcupsd-3.14.14

[TE Dukes]

Hello,

Looking for a apcupsd 3.14.14 rpm.

Been getting communication lost errors. I read there was a problem with the
3.14.12 version regarding a usb connection which I'm using, but has been
corrected in 3.14.14.

I found a Fedora 25 Rawhide src version, but the link must be bad. Was
hoping I could rebuild it for Cento 6.

Looks like apcupsd no longer producing the rpms.

I could build one from the source but would prefer to use an rpm.

TIA

___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

[CentOS] [OT] tis the season

[geo.inbox.ignored]

Happy Holidays to all centos devs and users.


-- 

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@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] how to create a kickstart file from an already installed system

[geo.inbox.ignored]

On 12/24/2016 04:35 PM, Peter wrote:
> On 25/12/16 04:17, geo.inbox.ignored wrote:
>> will read 'man show-installed' to see what it is about.
>
> It shows what packages and groups you would need to install, and/or
> exclude to re-create the packages on your system.  -f kickstart tells it
> to output in kickstart %package section format, so you can quite
> literally copy and paste the output into your kickstart file.
>
}}

ok. thanks for info.

been busy with some 'put off' chores, almost finished.

hopefully i will get back to kickstart setup before tomorrow ends.


-- 

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@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] Noise Cancellation of Server Noise

[Dave Stevens]

Quoting Digimer :


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@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





___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] how to create a kickstart file from an already installed system

[Peter]

On 25/12/16 04:17, geo.inbox.ignored wrote:
> will read 'man show-installed' to see what it is about.

It shows what packages and groups you would need to install, and/or
exclude to re-create the packages on your system.  -f kickstart tells it
to output in kickstart %package section format, so you can quite
literally copy and paste the output into your kickstart file.


Peter
___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] Noise Cancellation of Server Noise

[Digimer]

On 24/12/16 05:18 PM, John R Pierce wrote:
> 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-1ks6cn2
>>
> 
> wow, $9100 for the 38U rack.thats pricey... and that's before PDUs,
> UPS, and all that other important rack mount stuff.

To be fair, OP didn't specify a budget. Also, I typo'ed 'CS' should have
been 'CX'.

You can probably DIY a quieter rack for a lot less. There might also be
other companies with similar products for a lot less. I don't know, I
just remembered seeing the CX in the past.

-- 
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@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] Noise Cancellation of Server Noise

[John R Pierce]

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-1ks6cn2


wow, $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

___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] Noise Cancellation of Server Noise

[Digimer]

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?
___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] Noise Cancellation of Server Noise

[John R Pierce]

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@centos.org
https://lists.centos.org/mailman/listinfo/centos

[CentOS] Noise Cancellation of Server Noise

[H]

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@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] how to create a kickstart file from an already installed system

[geo.inbox.ignored]

On 12/24/2016 03:28 AM, Peter wrote:
> On 24/12/16 16:11, geo.inbox.ignored wrote:
>> any hints beyond what is there?
>
> yum install yum-utils
}}

already installed.

> show-installed -f kickstart
}}

will read 'man show-installed' to see what it is about.

thank you for your reply. appreciated.


-- 

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@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] how to create a kickstart file from an already installed system

[geo.inbox.ignored]

On 12/23/2016 09:11 PM, geo.inbox.ignored wrote:
> On 12/23/2016 07:15 PM, Jonathan Billings wrote:
>> On Dec 23, 2016, at 7:50 PM, geo.inbox.ignored  
>> wrote:
>>> system also has packages install from other sources.
>>>
>>> read the centos wiki pages for kick start files, did not find info
>>> for such. either it is not there or i missed it.
>>
>>
>> If you mean other Yum repositories, you need to add them using the
>> “repo” syntax, as described here:
>>
>> https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Installation_Guide/s1-kickstart2-options.html
>>
> }}
>
> yes. the link seems to be what i am looking for. seems, because
> i did a quick skim of what is there. also back up to start of
> Chapter 32. Kickstart Installations so i can read all of what
> is written on kickstart.
>
> any hints beyond what is there?
>
> thank you for replying. greatly appreciated.
>
}}

after looking thru above guide, it hit me that my
search was improper.

tried search again using single word 'kickstart'.

a big diff.

best of which;

  https://geekpeek.net/kickstart-file-centos/

shows step by step instructions with graphics of
the 'kickstart configurator'.

much better then what the red hat and centos
instructions show, and all contained on 1 page. ;=)

again, thanks for your help. you put me in right
direction and correct spelling.


-- 

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@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS-docs] dead links and request for home page

[John R. Dennison]

On Sat, Dec 24, 2016 at 12:20:13AM +0200, Mika Hämäläinen wrote:
> 
> I made the two corrections mentioned earlier and then one for the road
> (changed "irsii" to "irssi"). Didn't catch it the first time around, since
> I thought it was a new fork or similar. I couldn't find it with google
> though, so I deduced it to be a typo.

It was indeed a typo; one I missed when I reviewed the page last year.

Thank you for catching that and also for correcting the two links.




John
-- 
Art is a moral passion married to entertainment.  Moral passion without
entertainment is propaganda, and entertainment without moral passion is
television.

-- Rita Mae Brown (1944-), American writer, Starting From Scratch (1988)


signature.asc
Description: PGP signature
___
CentOS-docs mailing list
CentOS-docs@centos.org
https://lists.centos.org/mailman/listinfo/centos-docs

Re: [CentOS] New laptop recomendation

[Tony Molloy]

On Tuesday 22 November 2016 15:23:08 Tony Molloy wrote:
> Hi,
> 
> I'm recently retired from my university job. I am looking for a
>  laptop to run CentOS 6/7. My university was a traditional Dell
>  site so I've used Latitude laptops for years, currently
>  E6500/E6510.
> 
> Anybody got any experience of running CentOS on the newer Dell
> Latitudes E5000 or E7000. These are not certified according to
>  Redhats' Hardware Guide.
> 
> Alternatively Precision Workstations would do. These can be
>  supplied with Ubuntu installed so they run Linux.
> 
> Thanks,
> 
> Tony
> 

Thanks to all who replied to my request above. I'm sorry for the delay 
in replying but I've been in hospital for the past month, just out on 
christmas leave.

I finally ordered a Precision 7510 Workstation, as recommended by a 
couple of people. It arrived with Ubuntu installed ( god I don't like 
Unity ) Over my christmas break I'll have a go at installing CentOS 7 
and let ye know how I get on.

Again thanks to everyone who took the time to reply, and have a Happy 
Christmas and a Merry New Year.

Tony. 
-- 
Linux nogs.tonyshome.ie 2.6.32-642.11.1.el6.x86_64 #1 SMP Fri Nov 18 
19:25:05 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] how to create a kick start file from an already installed system

[Peter]

On 24/12/16 16:11, geo.inbox.ignored wrote:
> any hints beyond what is there?

yum install yum-utils
show-installed -f kickstart


Peter
___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos