NEMA Electroindustry, Apr. 2014, by David Sonner.
http://www.nxtbook.com/ygsreprints/NEMA/g40829_nema_ei_apr14/#/18

"The data center is one of the most dynamic and critical operations in any business. Complexity and criticality have only increased in recent years as data centers experienced steady growth in capacity and density, straining resources and increasing the consequences of poor performance." Article discusses six approaches to improve performance.