Mission Critical - Winter 2008 - (Page 78)

Datacenter Wiki wiki-Mission Critical that will reside above a raised floor space. Data centers rarely have a homogeneous load profile, and while racks of blade servers may indeed possess substantial power requirements, the other components that will reside in the data center with them do not. Cabling oefficient of Efficiency (COE) – The traditional and patch panels, for example, require no power at all, and definition of efficiency compares total input to total other components such as network/telco (10-50W/sf) and output in one fashion or another. A COE for a data spinning disk storage (100W/sf) have rates of power concenter should take into account the actual output of a data center and not just stop at the UPS (which is “just” an input sumption considerably below those of high density servers. kW of IT load accurately captures this heterogeneous to the processors). nature of real-world data centers, resultA data center COE implies the total ing in a metric that all parties can agree DC system efficiency. But looking at just Data centers rarely on and that will lead to a more successUPS output only looks at the DC power have a homogeneous ful data center development process. efficiency and does not account for inef(Chris Crosby, Digital Realty Trust) ficiencies on the processor side. For a load profile, and while Premium Power – A term used to total system COE, input would still be racks of blade servers describe the service offered by Balaverage kWe (assuming that water conmay indeed possess timore Gas & Electric, the regulated sumption costs for cooling systems are substantial power business unit of Constellation Energy. minimal), but output could be measured BGE (Baltimore Gas & Electric) introas MB per sec, or something similar. The requirements, the duced the program to provide electrispecific COE that was proposed would other components cal service on the customer’s side of be more akin to a “COE-Power Converthat will reside in the the meter, which exceeded the utility’s sion”, so as to indicate that it only looks tariff standards for voltage quality and at a sub-system of the total DC. (Marijn data center with them reliability. The BGE “Premium Power Braadbaart, CEM, Energy Solutions, do not. Program” was the utility industry’s first Murphy Company) program that focused on the unique kW of IT Load – Square footage is often used as a standard unit for providing a basic measure needs of the individual customer. The program consisted of the size and capacity of data center, but unfortunately the of a site inspection, diagnostic testing, a solutions proposal measure of square feet is not universal across all involved and a turnkey solution including the appropriate scheduled parties. Real estate professionals, IT managers, and building maintenance and 7 by 24 emergency services to support engineers each interpret square footages differently, which the installed power conditioning, uninterruptible power leads to confusion in the data center planning process and supplies and/or standby generators to support the cusoften results in a data center that is unable to accommodate tomer’s mission critical needs. The “Premium Power Program” was administered by future growth because it is literally out of floor space. kW of IT load is a more accurate and reliable metric than square the Marketing & Energy Services Department of Baltimore footage for describing data center space and power require- Gas & Electric. The program was developed with and supments because it accurately reflects the power requirements ported by the Liebert Corporation and its local representative: of a data center based on the footprint of all the components Ward-Boland Associates. (Arthur H. Beasman, CEM) ■ Editor’s note: Mission Critical will award a Mission Critical coffee mug to the reader who submits the most interesting wiki submission published in next month’s issue. C Please submit your own term and definition to Kevin Heslin at HESLINK@BNPMEDIA.COM 78 | Mission Critical Winter 2008

Table of Contents Feed for the Digital Edition of Mission Critical - Winter 2008

Mission Critical - Winter 2008 Table of Contents Editorial: What Have We Been Doing? Cronin’s Workshop: Imagining the Perfect Data Center Power And Cooling Solution Digital Power: The Next Edge in Business Resiliency Zinc Whiskers: Keeping Up With The Green Movement Mission Critical Care: Shipping, Staging, and Installation Legal Perspectives: “A Reliable Energy Supply Is Key to Data Center Success” Continued Payback, Instant Protection Beyond the Nines The Green Information Technology Revolution Health Care Network Offers Glimpse of the Future of Backup Power High-Density Data Centers – Discuss, Design, Deploy High Performance Data Centers Call for Innovative Cooling Techniques More Data in the Data Center Five Considerations for Powering Data Center Racks New Products Industry News Events Classifieds Letters Ad Index Datacenter Wiki: wiki-Mission Critical

Mission Critical - Winter 2008

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