Real-time data collection

PUE and DCiE monitoring

Capita Business Services

We had a requirement to improve on the accuracy and time way we calculated the PUE (Power Efficiency) of our separate data centres in Kent and Essex. The relevant data was available on various (Schneider) power meters located around the data centres but it was a laborious task to manually collect the data in-order to calculate matters. Spook OmniWatch continually monitors our key power metrics and we are now in a position to become more energy efficient and to reduce our carbon footprint.

Capita Business Services

An international business outsourcing company.

The benefits of PUE/DCiE monitoring

The industry standard for measuring power efficiencies is known as Power Usage Effectiveness (PUE) and Data Centre Infrastructure Effectiveness (DCiE).

By monitoring PUE and DCiE in real-time ensures a clear audit is available as efficiencies are gained.

PUE and DCiE calculator

Power measurement by-product

By measuring power at key areas coming into a facility means there are many valuable readings that provide important additional information.

PUEDCiELevel of efficiency
3.033%Very inefficient
1.283%Very efficient
PUE and DCiE are efficiency benchmarks to help you understand and manage your IT load.

The objective is to ensure that the maximum possible percentage of power utilised in a data centre is actually used by IT equipment and the minimum by supporting equipment such as AC units.

Clearly things such as antiquated and/or unreliable AC units will have an adverse effect on the PUE.

However knowing what the PUE figure is allows customers to highlight areas for improvement to better the PUE rating over time.

Read Google’s Green Data Centers: Network POP Case Study

Power Consumption Fluctuations

Total electrical power consumed by IT equipment in data centres has been relatively stable historically, but new designs for server processors include energy management capabilities that can result in substantial power consumption fluctuations.

This can present potentially numerous problems, including overheating, overloading a circuit breaker and loss of redundancy.

Disaster Recovery (DR) and Business Continuity (BC)

Tripping the circuit breaker and taking out part or the whole data centre is not uncommon. Power related DR and BC invocations remains one of the top three reasons for business continuity invocation for the last 25 years.

Computational Loads

Typically servers operate at light computational loads, with actual power draw amounting to less than the server’s potential maximum power draw capabilities.

However, because many IT personnel can be unaware of this discrepancy, it’s easy to plug more servers than are necessary into a single power circuit.

This in turn creates the potential for possible circuit overloads, as the circuit rating can be exceeded by the total maximum server power consumption.

Circuit overloading

Another complication is that when servers are simultaneously subjected to heavy loads, circuit overloads will occur. When circuits are overloaded, the entire circuit can be tripped and power shut off to IT equipment.

Furthermore, since this happens as a result of heavy loads, power outages at this time can have significant negative effects on business.

Setting alerts for high capacity

If the maximum load for a power circuit is known, by setting alerts for times when the load is being neared can prove life saving for the IT department.

Data Centres Energy Efficiency Code of Conduct

Spook is an approved Endorser of the European Code of Conduct for Data Centres.

The Data Centres Energy Efficiency Code of Conduct has been established in response to increasing energy consumption in data centres and the need to reduce the related environmental, economic and energy supply security impacts.

The aim is to inform and stimulate data centre operators and owners to reduce energy consumption in a cost-effective manner without hampering the mission critical function of data centres.

The Code of Conduct aims to achieve this by improving understanding of energy demand within the data centre, raising awareness, and recommending energy efficient best practice and targets.

Read more 2019 best practice guidlines

PUE and DCiE calculator

Total Facility Energy

Enter in the total amount of energy your facility is using (kW)


Total IT Equipment Energy

Enter the total amount of energy your IT equipment is using (kW)





Get in touch with Spook

Please contact us if you wish for further information on how Spook can help with your environmental and power monitoring needs.

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