Reshared post from Google

I love the leading quote from Kelvin: "If you don't measure, you can't improve." Brilliant.

A quick glance at Wiki shows the original quote is unsourced and disputed, but goes like this: "There is nothing new to be discovered in physics now. All that remains is more and more precise measurement",_1st_Baron_Kelvin#Pronouncements_later_proven_to_be_false

In any case, good work keeping the Digital Age green, Google!

Google originally shared this post:

Our data center teams constantly track our energy consumption and use that data to make improvements to our infrastructure—one of the reasons why Google’s data centers use 50 percent less energy than the typical data center.

One of the measurements we use to track the energy consumption in our data centers is PUE, or power usage effectiveness. PUE is a ratio of the total power used to run a data center to the amount used to power the servers. For instance, if a data center has a PUE of 2.0, that means that for every watt of energy that powers the servers, another watt powers the cooling, lighting and other systems. An ideal PUE would be 1.0.

In 2011, our trailing 12-month average PUE was approximately 1.14—an improvement from 1.16 in 2010. These numbers are based on actual production data—they’re the real-world numbers, not based on design specs or best-case scenarios.

You can read more about our 2011 PUE on our data center site: or in our blog post, below.

Measuring to improve: comprehensive, real-world data center efficiency numbers

To paraphrase Lord Kelvin, if you don't measure you can't improve. Our data center operations team lives by this credo, and we take every opportunity to measure the performance of our faciliti…

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