1. IntroductionWith regard to the development of information technology (IT)during the recent years, the number of data centers is increasingsharply. Recent energy reports indicate that the data center industryconsume approximately 1.3% of the total energy around the globe[1,2]. Moreover, this demand will be doubled every two years until2020 [3,4]. This high energy consumption causes global warming dueto CO2 emissions into the environment [5]. According to EnvironmentalProtection Agency (EPA) report, the share of the information andcommunications technology (ICT) in global CO2 emissions is about 2%