Energy Efficient Data Center in Cloud Computing

In fact, Gartner projected global revenue for cloud computing to reach almost $150 billion by 2014. However, the 2011 market is already approximately $68 billion globally. With increase in web technologies and internet, a proportional increase in cloud computing technologies has been cited. Cloud computing has been emerging as a flexible and powerful computational architecture to offer ubiquitous services to users. A variety of hardware and software resources are integrated together as a resource pool, the software is no longer resided in a single hardware environment, it is utilized according to the schedule of the resource pool for optimized resource utilization. The optimization of energy consumption in the cloud computing environment is the question how to use various energy conservation strategies to efficiently allocate resources. The need of different resources in cloud environment is unpredictable. It is observed that load management in cloud is utmost needed in order to provide QoS (Quality of Service). The jobs on over-loaded physical machine are shifted to under-loaded physical machine and turning the idle machine off, in order to provide green cloud. For energy optimization, DVFS and Power-Nap are good strategies. As good amount of this energy is wasted in idle systems: in typical deployments, server utilization is below 30%, but idle servers still consume 60% of their peak power. In this paper, we have proposed an algorithm for energy optimization having the constraint QoS and SLA.