Various metrics have been developed over time for optimizing the supporting facilities of a data center such as the power and cooling infrastructure. Metrics such as PUE, WUE etc. have made inroads in the data center industry for many years and, although often abused, they have helped the industry to create awareness and improvements.
However, it is EPI’s stand that the best savings can be made at the computer room level. The reason is simple because of PUE, for every kW on the computer room floor, there will be a multiple of it at the facility entry.
Another issue in the industry is that there tends to be a habit of overdesigning and underutilization, causing excessive wastage of valuable resources as well as creating negative impact on expected investment returns.
Furthermore, MTDCs (Multi Tenanted Data Centers) could end up being penalized due to oversubscribed, and underutilized, computer room utilization which will have an impact on the overall PUE, WUE and other energy efficiency factors that the MTDC might be required, sometimes by law, to achieve.
EPI has developed a new metric, CRUR® (Computer Room Utilization Ratio), to address this issue. Data center owners, operators and end-users can use CRUR® to optimize the computer room utilization right now. They can also use it for trend analysis which could positively impact the design criteria for data centers to be built in future, resulting in better efficiency, utilization and return on investment.
CRUR® is the first ever metric designed to measure and optimize the core of many data center efficiency issues which is the computer room itself. It is clear that CRUR®, together with metrics such as PUE, will create a positive impact on the environmental impact.
The scope of the CRUR® metric is the computer room, and its direct supporting infrastructure which includes electrical (power), mechanical (cooling) and ICT.
The CRUR® metric can be applied to IT, or facilities, or both. The three scopes are indicated respectively as:
CRURIT : Computer Room Utilization Ratio for IT components only
CRURF : Computer Room Utilization Ratio for Facilities components only
CRURITF : Computer Room Utilization Ratio for IT & Facilities components
The organization can choose any one of the metrics depending on the business requirements and scope of control. For example, an Enterprise Data Center might prefer to implement CRURITF as it has full control over both the data center facilities as well as the ICT infrastructure, whereas a commercial data center operator might prefer to only implement CRURF as they (might) have very little or no control over the ICT equipment deployed by their customers. Cloud providers might consider using the CRURITF as they often have full control over both the facilities and ICT equipment.
There are several key advantages for data center operator/owners when applying CRUR®:
Organizations can self-assess the CRUR® metric. However, the organization must declare the scope (CRURIT/CRURF/CRURIT) and must state that the declared value is based on a self-assessment.
EPI and its authorized audit organizations are able to provide an official audit and certification for CRUR®. Please contact firstname.lastname@example.org for more information.