Managing Distributed UPS Energy for Effective Power Capping in Data Centers Blind Review

Power over-subscription is a well-known technique to reduce both one-time capital costs and operating costs for modern data centers. However, designing the power infrastructure for a lower operating power point than the aggregated peak power of all servers requires dynamic techniques to avoid high peak power costs and, even worse, tripping circuit breakers. This work proposes the rst design for distributed per-server UPS architectures that store energy during low activity periods and use this energy during power spikes. It leverages the distributed nature of the UPS batteries and designs algorithms that prolong the duration of their usage. This approach shaves 19.4 % of the peak power for modern servers, allowing the installation of 24 % more servers within the same power budget. More servers amortize infrastructure costs better and, hence, reduce total cost of ownership per server by 6.5%, with a corresponding increase in prots. These benets increase considerably as servers become more energy proportional.