09-08-2003, 06:41 AM
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Web Hosting Evangelist
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Join Date: Jun 2001
Posts: 473
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Hi guyz
I am looking to colo at HE facility. They are running a special promo but they are only allowing 15amps of power per rack. I am just wondering how many P4 servers can 15amps accomodate??
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09-08-2003, 01:17 PM
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Web Hosting Master
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Join Date: Nov 2002
Posts: 2,780
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I measured it once before. A P4 2.4ghz, with 1 HDD, 1 GB ram, consumes 0.63amps at idle, and jumps to around 1.3 when it's doing something.
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09-08-2003, 02:22 PM
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Web Hosting Master
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Join Date: Oct 2001
Location: USA
Posts: 1,020
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In addition to Mfjp, a server may consume twice as much power of its normal operation when it starts up.
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09-08-2003, 08:06 PM
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Junior Guru Wannabe
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Join Date: Aug 2001
Location: USA
Posts: 59
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what kind of rack is it?
How many server can a rack accomodate ?
The more server a rack will accomodate, the more power you'll need. Generally 15-20 amps should be enough to run 20 P4 servers. (rough estimates) However just remember the more hardware you have (more disk drives & multiple procs), the more likely you are to run into power problem
Ed
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09-09-2003, 04:39 AM
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Web Hosting Master
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Join Date: Nov 2002
Posts: 2,780
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rey,
Startup is at 2.2amps right at power on. So be careful and start your servers one by one, or you'll have a blow circuit breaker.
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09-09-2003, 04:42 AM
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Web Hosting Evangelist
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Join Date: Jun 2001
Posts: 473
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09-09-2003, 07:21 PM
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Web Hosting Master
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Join Date: Apr 2003
Posts: 734
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09-09-2003, 09:20 PM
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Will Host for Food
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Join Date: Jul 2002
Location: London, United Kingdom
Posts: 3,680
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it depends a bit on the hardware, no of drives etc, but *generally* they idle at a little below 1 and peak at 2.5 at post/powerup
in 16A you can comfortably run 20 pieces of kit - servers/switches/screens etc
make sure you set them on delayed startup through something like an APC masterswitch - otherwise in the event of power fail, when restored they all fire up at the same time and blow your pdu's / trip out your circuits.
We tend to find we run out of power before we run out of space in the racks
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09-10-2003, 05:31 PM
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Web Hosting Master
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Join Date: Jun 2001
Location: Denver, CO
Posts: 3,210
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20 P4 servers on one 15 amp curcuit is asking for problems. We were able to fit about 12 P4 (some dual Xeon) servers to a 20 amp circuit before it was at capacity (80%) load. You will likely need between 40 and 60 amps to fill a cab completely.
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09-10-2003, 08:23 PM
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Web Hosting Master
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Join Date: Apr 2003
Posts: 734
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othellotech - let me guess - your in Redbus?
Redbus has got major power issues - which is why we stayed away! Way too cheap imo.
All of our racks in telehouse are fullup with 1U servers - most of them with scsi - and we havent had any issues with power. Once i stupidly plugged the power into a new rack - 40 servers powered on without any problems!
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09-10-2003, 08:35 PM
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Will Host for Food
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Join Date: Jul 2002
Location: London, United Kingdom
Posts: 3,680
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yup we're in Redbus and very happy, most racks have 8a, some have dual-feed so 16a, the thread starter asked about power usage so i gave some examples
wub - you not running apc units for remote reboot ? they have a habit of frying if you powerup all the sockets simultaneously - lost a few snmp management cards that way - have them each on a 5 sec incrementing delay now
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09-10-2003, 10:54 PM
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Web Hosting Master
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Join Date: Nov 2002
Posts: 2,780
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20 machine on 15 amps??? Are we on 230V 15amps circuit?
On 110V AC, it needs close to 40amps to power a full rack.
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09-11-2003, 02:14 AM
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Will Host for Food
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Join Date: Jul 2002
Location: London, United Kingdom
Posts: 3,680
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uk 240v 16a wil power 20 machines yes
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06-07-2004, 05:33 AM
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Disabled
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Join Date: Jun 2004
Posts: 3
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Hi,
I have 16 P4 machines running and they are using arround 4amps?
Why?
Everyone here is saying they should use 16A?
Any idea's?
Kind regards
Jon
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06-07-2004, 12:53 PM
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Web Hosting Master
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Join Date: Mar 2004
Location: New York City
Posts: 995
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Because you're using 240V and we use 110V in the US, and you need allowances for simultaneously powering the servers on, as well as simultaneous load.
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Sam Machiz / Director, Product Development / Ubersmith
smachiz[at]ubersmith.com / [direct] 212-812-4194
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