DATA CENTRE MANAGEMENT FEATURE
Working with data inputs from the extensive instrumentation that Comtec had previously installed, the new software module provided a much more comprehensive picture of power and cooling consumption throughout the data centre infrastructure and presented it on a centralised console, where it could be easily viewed and analysed by Beedie and his team. It allowed them to get a much deeper,
Continued from Page 10... Calculating PUE accurately for a data
centre with such mixed functions presents its own challenges. Cooling provision for the systems that support the general IT needs remain reasonably consistent, whereas, for the high- performance work that ARCCA performs, the systems tend to be operated at peak.
ENERGY EFFICIENCY UPGRADE As part of the power and cooling upgrade managed by the University’s Estates division, Comtec deployed Schneider Electric’s Data Center Operation: Energy Efficiency module as an additional component to the previously installed StruxureWare for data centres.
Hugh Beedie, chief technology officer, worked closely with the ARCCA team to ensure the HPC Datacentre infrastructure is truly fit for purpose
more granular insight into energy usage, not just at an overall site level but also at subsystem level. Critically, it did so in real time. This enabled Cardiff to monitor the effects on energy consumption of changing fan speeds, of CPU utilisation on a server rack, or of raising the temperature of the chilled water supply. The new cooling services design had
some specific elements aimed at improving energy efficiency. For example, the replacement of all three existing chillers with new high efficiency 300kW models, to provide a symmetrical system, and the introduction of a secondary cooling circuit. Individual high efficiency Variable Speed Drive (VSD) pumps were also fitted individually to each chiller to give better ‘turn-down’ ratios.
IMPROVED EFFICIENCY The new cooling equipment upgrade, together with the new monitoring software, has seen major improvements in the energy efficiency of the data
centre, despite the additional HPC servers. Depending on ambient heating conditions, the real time PUE rating has been as low as 1.2, according to Beedie. “The additional information about
energy consumption has enabled me to see the real-time effect of warm weather as the day heats up. As the day starts, our PUE figure is running at about 1.20 but by the end of a hot afternoon it’s up to about 1.25, 1.27 and then drops down again as the evening cools. This degree of detail enables me to be confident that we are adopting an appropriate operating regime for the cooling system.” Monitoring the effects of small changes to operations in real time, enables clarity about the interaction of the control of the chillers. It also gives an insight into the operation of the HPC servers. For example, if the chillers are running below maximum power, it can be immediately seen whether it is more efficient to run all three at reduced load, or turn one off and run the remaining two at part load. “The only way you can clarify this is by having this instrumentation and trying it under varying operational conditions,” he says.
CP Electronics
www.cpelectronics.uk.com T: 0333 900 0671
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