New Recommendations for Measuring and Reporting Overall Data Center Efficiency

The Green Grid recently published its final volume of guidelines for applying the power usage effectiveness (PUE) metric. It includes recommendations for how to measure and calculate PUE in mixed-use data center facilities. The association says that this standard methodology will allow data center operators to come up with consistent strategies to monitor and improve energy efficiency:

“As business demands and energy costs for data centers rise, owners and operators have focused on the energy efficiency of the data center as a whole, frequently using energy efficiency metrics. However, the metrics are not always applied clearly and consistently. To address these inconsistencies, a group of leaders from across the industry met to agree on data center energy efficiency measurements, metrics, and reporting conventions.”

The following guiding principles were agreed to:
1. Power Usage Effectiveness (PUE) using source energy consumption is the preferred energy efficiency metric for data centers.
2. IT Energy consumption should, at a minimum, be measured at the output of the Uninterruptible Power Supply (UPS). However, the industry should progressively improve measurement capabilities over time so that measurement of IT energy consumption directly at the IT load becomes the common practice.
3. For a Dedicated Data Center, the total energy in the PUE equation will include all energy sources at the point of utility handoff to the data center owner or operator.
4. For a Mixed-Use Data Center, the total energy will be all energy required to operate the data center, similar to a Dedicated Data Center, and should include cooling, lighting, and support infrastructure for the data center operations.

Find the whole report after the following link:

The Green Grid | Recommendations For Measuring and Reporting Overall Data Center Efficiency Version 2 – Measuring PUE for Data Centers (May 2011)

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