Low-Power Home Linux Server?
mpol writes "For years I've been using a home server with Linux, but recently I've been having doubts about the electric bill. I'm not touched by the recession yet, but I would like to cut costs, and going from a 100-Watt system to a 30-Watt system would save me 70 bucks a year. The system doesn't need to do much, just apache, imap, ssh and some nfs, but I do prefer to have a full-fledged system, where I can choose what to install on it. I also don't really care if it's a low-power Via or an ARM processor as long as it's cheap. I'm aiming for $300 or less for a full system, which I could then earn back in about four years through power savings. I've been reading about the Western Digital Mybook World Edition, which has an ARM processor but isn't that easy to install Debian on. A Mac Mini draws about 85 Watts, so that isn't an option either. Something a bit more than turn-key would be fine, but preferably not a complete hack-job. Adding a temporary CR-ROM or DVD-ROM, or a USB disk with an iso to install from would be nice. Any Slashdotters run nice and cheap low-power Linux systems? What can you recommend?"
You don't look like you need extensive processing power, so why not just underclock your current server? That alone will save you a pretty penny on your bill.
Also, the mac mini draws 110 watts http://store.apple.com/us/browse/home/shop_mac/family/mac_mini?aid=AIC-NAUS-K2-BUYNOW-MACMINI-DESIGN&cp=BUYNOW-MACMINI-DESIGN
"The difference between genius and stupidity is that genius has it's limits" - Albert Einstein
An old laptop will probably give you the lowest power for the cheapest cost. It doesn't sound like reliability or performance is your main concern. You can disassemble it and take out the LCD to save a couple more watts if you want, but a typical laptop draws between 10-20 watts.
The SheevaPlug is great: I've come down from over 600W for a rack of Solaris servers via 18W for a Linux laptop to now under 4W for a SheevaPlug (all quiet/typical consumption) to provide the same services, see:
http://www.earth.org.uk/note-on-SheevaPlug-setup.html
(Served off the plug indeed...)
I've reduced the consumption so much that the plug now runs entirely off-grid from a small array of solar PV panels (under 200Wp) with a small (12V, 40Ah) battery to cover nights and very dull days...
Rgds
Damon
http://m.earth.org.uk/