Luke S Crawford wrote: > "Mark R. Lindsey" <[email protected]> writes: > > >> Koomey [1] reported recently that a a mid-range server uses 424 >> watts, on average, in the US. He also suggested that power and loss >> due to electrical distribution is roughly equal to actual server >> consumption, so that the total electrical power to run this server is >> 2.0*424 = 848 Watts/server. >> > > > you are missing something pretty big here: every watt of power your server > eats gets turned into heat, and the data center spends anoutehr 2-4 watts > pumping that heat out. This is usually priced into co-lo power > (and why co-lo power usually is quite a bit more expensive than regular > grid power.) > > > 2-4 is the sign of a very poorly designed datacenter (or perhaps one that was designed and built several years ago where cold and hot air mix and waste a lot of energy). A modern, well-designed datacenter should be an extra .5-1W per machine, depending upon configuration and efficiency of installed cooling equipment. Now, colo facilities are likely to 'inflate' those numbers to pad their profit margin. Many of them will charge you for the electrical circuit whether you use it or not. That cost includes the cost to remove the heat, but, if you're not generating heat, you pay for it all anyway.
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