[kwlug-disc] [OT] linux server power

John Johnson jvj at golden.net
Sat Jan 29 08:24:41 EST 2011


On 2011-01-29 06:57, Raul Suarez wrote:
> Coincidentally I was reading about trixbox and found this
> http://www.888voipstore.com/trixbox-ce-micro-appliance.html   
In context, the power consumption of the "fanless" trixbox PBX (which 
can run under Linux) is:
<1W at standby
6W at low CPU load
<7W at 1080p H.264 playback
8W at full CPU load

Assuming a VoIP server at approx. 100W and 7W for the trixbox VoIP 
server we have a savings of 93W.

per John Van O

a 100W load running 24x7 would use 100W * 24H * 30.5 days / 1000 = 73.2 kilowatt hours.
At 10c/KWh that's $7.32/month. (note: the 10c/kWH is an estimate and could be on the high side)

substituting 7W for 100W we have:

a 7W load running 24x7 would use 100W * 24H * 30.5 days / 1000 = 5.1 kilowatt hours.
At 10c/KWh that's $0.51/month.

The savings of 93W over 24x7 would be 93W * 24H * 30.5 days / 1000 = 68.1 kilowatt hours.
At 10c/KWh that's $6.81/month.

Nothing to sneeze at.
Except when one looks at the payback.
Assuming a cost of $400 ($US == $CDN) the payback is 58 months or almost 5 years.

One would likely need another reason to justify the expense, e.g. downtime, reliability, size, noise, etc.
Or just simply the geek factor.

JohnJ





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