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Overview

Information technology clients expect availability of €˜Five-Nines', or 99.999%
Unfortunately, the substantial investment that a business makes to achieve Five-Nines in its computer hardware and software platforms is unlikely to be sufficient unless matched with a complementary site infrastructure that can support their availability goals. The overall site tier rating is dependant on all aspects of the site infrastructure and will be the lowest of the individual sub system ratings covering such aspects as power, cooling and distribution etc. It is important to be aware that sustainability (how the site is operated once constructed) also plays a significant role in what site availability is actually achieved. All too often people wrongly assume that installing a UPS is the end of their problems. However, if the overall design, installation and ongoing service support is handled badly, it could just be the beginning. For example, it is vital to ensure that the Mean Time To Repair (MTTR) the system is kept to a minimum if the highest overall availability is to be achieved. Nowhere is this more important than with the design of data centres.

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