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Feature Checklist: The top 12 data centre best energy saving practices Quick impact fixes for underperforming data centres BHEN-8JVHXA_GB If enterprise data centres are to become more energy efficient, a number of pragmatic operational approaches will have to be implemented. Efficiency optimisation must deal with the data centre system as a whole. Attempts to optimise the individual inefficiencies will be less effective. The following system-wide practices provide a checklist for improved data centre efficiency: 1 Powering off unused equipment Power and cooling equipment that is not needed should not be energised. 2 Deploying hot aisle / cold aisle arrangement The rows of racks should be oriented so that the fronts of the servers face each other. Such a layout, if properly organised, can greatly reduce energy losses and also prolong the life of the servers. 3 Tuning redundant systems Subsystems that must be used below their rated capacity (to support redundancy) should be optimised for their fractional-load efficiency, not for their fullload efficiency. 12 Intelligent Energy www.SEreply.com 1300 369 233
4 Leveraging the intelligence of capacity management tools These tools help to minimise ‘stranded capacity’ within the data centre, allowing the maximum amount of IT equipment to be installed within the gross power and cooling envelope, pushing the system to the highest point on its efficiency curve. 5 Instrumentation to monitor energy consumption The data centre should be instrumented to identify and warn about conditions that generate suboptimal electrical consumption, so that energy waste situations can be quickly corrected. 6 Scalable power and cooling to enable right-sizing The use of a scalable power and cooling solution can increase efficiency in smaller data centres or in data centres that are early in their life cycles, as well as defer capital and operating costs until needed. 7 Row-based cooling Shortening the air flow path via row-based cooling reduces mixing of hot and cold air streams, which improves the predictability of air distribution and improves the efficiency of delivering cold air to the loads that need it. 8 ‘Free cooling’ This is a common term used to denote a data centre operating in ‘economiser mode’. While not truly ‘free’, these technologies can be very helpful in improving data centre efficiency in the appropriate geographies. Cooling economiser systems save energy by utilising outdoor air during colder months of the year, allowing mechanical cooling systems like chillers and compressors to be shut off or operated at a reduced capacity. 9 High-efficiency UPS Technologies are now available that substantially increase the efficiency obtainable by UPS systems. 10 Variable frequency drives (VFD) Many electric motor-driven devices in the data centre operate at full speed even when the loads they are supporting require less capacity. Variable frequency drives (VFD) help to match the output of the fan to the load. The speed control mechanism in these devices helps to maximise efficiency. Both management software and wired and wireless thermal sensors can help in the regulation or control of VFD drives. 11 Modular containerised solutions Existing building structures often limit the electrical efficiencies that can be achieved through power and cooling distribution. Manufacturers can now build modular, containerised power and cooling modules that utilise standard power and cooling components and design them to a specific power usage effectiveness (PUE) target. Packaged, shipped, and installed as a container that plugs into an existing building, these solutions can rapidly increase efficiencies within existing data centres. 12 Hot aisle containment A hot-aisle containment system (HACS) allows higher work environment temperatures and increased chilled water temperatures, which result in increased economiser hours and significant electrical cost savings. Priorities for execution of this checklist will differ based upon the characteristics of the data centre being analysed. 1300 369 233 www.SEreply.com Intelligent Energy 13
Page 1 and 2: Intelligent March 2012 Energy Smart
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