Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Power Usage Effectiveness of the data center as a combination of engineering and IT infrastructure M.B. AMZARAKOV, R.R. SUKHOV, E.A. ISAEV, A.М. AMZARAKOVA The data center efficiency is accepted to evaluate as the ratio of all power consumed by the data center to the amount of power transferred for the operation of IT equipment (PUE). Thus, it becomes possible to calculate the amount of power expended on useful work and the amount of power expended on ancillary needs supplying power to IT-equipment. From the point of view of the data center, all the power transferred for IT-equipment is «useful». But is it? This article discusses the distribution and expenses of electricity «inside» IT-equipment, and also questions of an estimation of power efficiency of work of the IT equipment in total with power usage effectiveness of a data center are raised. Keywords: data center, Power Usage Effectiveness (PUE), power consumption. DOI: 10.25791/pribor.12.2019.1065 Contacts: - Pp. 50-55.