PUE, or Power Usage Effectiveness, which was developed by The Green Grid™, has become the standard for measuring data center efficiency. What does it really mean and how do I calculate it? Rumors are in industry is that you want to be as close to 1 as possible. Why 1? PUE is a ratio of the amount of power needed to drive and cool the data center vs the power draw from the IT equipment in the data center. 1, in the case of a ratio would mean that you have a perfect data center, one where all the power coming into the building makes it to the IT equipment with none used for loads to cool or light up the room and none lost in transmission to the IT equipment. The mathematics behind the ratio looks something like this:
PUE = (Total Facility Energy) / ( IT Equipment Energy)
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