Managing Distributed UPS Energy for Effective Power Capping in Data Centers
International Symposium on Computer Architecture(2012), pp. 488-499
Vasileios Kontorinis, Liuyi Eric Zhang, Baris Aksanli, Jack Sampson, Houman
Homayoun, Eddie Pettis, Dean M.
Tullsen, Tajana Simunic Rosing
Power over-subscription can reduce 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 presents an
architecture for distributed per-server UPSs that stores energy during low activity
periods and uses this energy during power spikes. This work leverages the
distributed nature of the UPS batteries and develops policies that prolong the
duration of their usage. The specific approach shaves 19.4% of the peak power for
modern servers, at no cost in performance, 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 6.3%.