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September 2012

Data centre cases where PUE or power usage effectiveness doesn't work

Power Usage Effectiveness, or PUE, is the phrase du jour for measuring just how effective and energy efficient an organisation’s data centre is. But, PUE remains a pretty crude measurement in many data centre instances and data centre managers must look at effective PUE or ePUE. At its simplest level, PUE is a direct relationship between how much energy is used across the whole of a data centre divided by how much energy is used to power the IT equipment. The basic equation can be shown as such: PUE = Total energy             IT energy Therefore, energy used in powering cooling systems, uninterruptable power supplies (UPSes), lighting and so on causes the PUE to be a higher number. Theoretical perfection is a PUE of 1, where all power is put into the IT equipment, with none being put into the support environment. The majority of existing data centres are running at PUEs of around 2.4, with large, multi-tenanted systems running at around 1.8 or less. Many different approaches have been brought to the fore to enhance PUE. These ...

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