[74997] in North American Network Operators' Group
Re: Energy consumption vs % utilization?
daemon@ATHENA.MIT.EDU (Andre Oppermann)
Wed Oct 27 07:13:38 2004
Date: Wed, 27 Oct 2004 13:13:07 +0200
From: Andre Oppermann <nanog-list@nrg4u.com>
To: nanog@merit.edu
In-Reply-To: <0f3201c4bc0b$07fb2c20$db00a8c0@ibmnik>
Errors-To: owner-nanog-outgoing@merit.edu
Nik Hug wrote:
> From: "Andre Oppermann"
>
>> From running a Colo in a place with ridiculus high electricity engery
>>costs (Zurich/Switzerland) I can tell you that the energy consuption
>>of routers/telco (70%) and servers (30%) changes changes significantly
>>throughout the day. It pretty much follows the traffic graph. There
>>is a solid base load just because the stuff is powered up and from there
>>it goes up as much as 20-30% depending on the routing/computing load of
>>the boxes. To simplify things you can say that per packet you have that
>>many "mWh" (milli-Watt-hours) per packet switched/routed or http requests
>>answered over the base load. I haven't tried to calulate how much energy
>>routing a packet on a Cisco 12k or Juniper M40 cost though. Would be
>>very interesting if someone (student) could do that calculation.
>
> the same variation between night and day here - but from our point of view
> the consumption of the air-pack's are making the differences during the day
> ... traffic-graph and outside temperature-graphs show more or less the same
> up and down. Would we interesting to have separate values for the power
> consumption between server-equipment and air-co ...
In this case the air-co is not included. That is measured on a separate
circuit for which I don't have any figures ready.
Also note that especially high-end routers draw power load dependent. With
SONET/SDH stuff I haven't seen it. The reason is circuit switching. They
switch continuously the same amount of data.
--
Andre
