[kwlug-disc] [OT] linux server power

Insurance Squared Inc. gcooke at insurancesquared.com
Sat Jan 29 08:37:54 EST 2011


There are other factors.
1) if I use something quiet and fanless, I can relocate out of the 
furnace room.  That's a plus.
2) Deduct the resale value of a 3.06 ghz tower server and a dual xeon w 
8gigs HP workstation (maybe $100total?) and payback period could be a 
year or two.
3) The machines are older, they're not forever.  I'll have to buy new 
hardware before 5 years is up.  So we're really looking at moving a 
purchase ahead 2-3 years rather than a brand new purchase.


The 10c per KWH was what the electrician used.  And if his high estimate 
of $30/month is reasonable, and we drop down to $7 a month electrical 
cost with lower hardware, and I sell the old equipment, payback is in 
less than a year.  How can I afford NOT to buy new computers?  :).






On 29/01/11 08:24 AM, John Johnson wrote:
> 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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