Today I’ve been readin about the EPA using EUE for Energy Star certification of data centers. Just when I thought these things couldn’t get any nuttier.
EUE in short is the amount of energy supplied at the supplying point vs the amount of energy used by the IT equipment. EUE (energy usage efficiency) is very similar to PUE (power usage efficiency) with two notable exceptions. PUE covers only electrical usage where EUE covers all energy coming in to the data center. PUE also only covers electrical power from the entrance to the facility, EUE covers the energy from the source.
So, how does this impact data centers? First, since this measures usage at the source, the data center gets penalized for losses in the power grid. Be ready to build your next data center right next to the generating station (not to mention any other required utility).
Second, now, all energy supplied is now counted. Using utility supplied water for lossy cooling? Prepare to get whacked for it!
Now, I’m not suggesting this is all a bad thing. This metric will drive the use of green techniques such as free air cooling and self generated power.
The biggest problem with EUE is exactly the same as PUE. The only sane measurement of efficiency is energy in vs work out. Both EUE and PUE totally ignore the amount of work being accomplished with the energy. This produces results that range from simply misleading to totally useless.
Can’ t we do better than this?
Vern, SwiftWater Telecom
data center, web hosting, Internet engineering