Everything You Wanted to Know About PUE

Blog Data Centre Innovation Wednesday 8th March 2017 • 3 min read
Rik Williams, Head of DC operations

Power Usage Effectiveness (PUE) is the measure of how efficiently a Data Centre uses energy.

How is PUE calculated?

In essence, the PUE is the ratio of the energy used by the Data Centre against the energy used by the Data Centre to deliver its services. It looks like this:

 

Don’t be fooled by its simplicity; this ratio is a big deal!

It is the most commonly used metric for reporting the energy efficiency of Data Centres. Moreover, PUE drives competition as Data Centres report lower and lower results.

Why is PUE Important?

PUE is a tool that Data Centre owners can use to measure how well the infrastructure is working. It also is a useful tool for identifying areas of improvement—the lower the PUE rating the more efficient the Data Centre.

The PUE is higher for more inefficient Data Centres; facilities that require more power will more than likely have higher operating cost.

PUE Level of Efficiency
3.0 Very Inefficient
2.5 Inefficient
2.0 Average
1.5 Efficient
1.2 Very Efficient

(Source: http://www.42u.com/measurement/pue-dcie.htm)

Is PUE a dynamic number?

The PUE will change as the load on the Data Centre changes, on both the overhead and IT equipment sides. Moreover, seasonal changes outside can affect a Data Centre’s PUE, too.

However, that doesn’t mean that the PUE is a useless number. It is a useful indicator of the effectiveness of the whole Data Centre, and can be used to highlight areas that need changing and improving.

Find out how Node4 measure their PUE here:

Data Centre Rundown: How To Achieve A PUE of 1.1

Related stories

Latest blog releases of interest...

Events
20th July 2017

Webinar – Introduction to GDPR Compliance

The upcoming 2018 GDPR legislation will affect every business across...

News
7th June 2017

Node4 opens new office and Security Operations...

Node4 announces the opening ceremony of a new office and...

News
6th June 2017

Node4 strengthens managed service capabilities with Onomi...

The Database Analysts team at Onomi are supporting Node4 customers...

News
22nd May 2017

Node 4 awarded G-Cloud 9 supplier status...

Node4, has been awarded a place on G-Cloud 9, the...


Discover Think Colocation is for you?

Purpose built demo suite

All Aboard the Mobile Solutions Centre