Existing and Relevant Methodologies for Energy Efficient Cloud Data Centers

Cloud computing is a novel paradigm which defines a new style of deploying systems. It realizes the vision of delivering Computing as a Utility. The demand for Cloud infrastructure has expanded with rapid growth of computing applications and data thereby amplifying energy-consumption. These results in heightened cost of ownership, reduced return on investment, narrowed profit margin, decreased reliability and availability of datacenter resources, and above all it adversely affects the environment by increases carbon footprint. Hence there is need for green computing and for energyefficient management of cloud datacenter resources besides meeting the QoS constraints. Within a datacenter, maximum energy is consumed by cooling systems and ICT Infrastructure, particularly, the servers. So it is of utmost importance to optimize energy utilization in datacenter servers. In order to achieve this, we can leverage the power of virtualization which is intrinsic in Cloud Computing. Virtualization opens the doors for VM consolidation by allowing dynamic migration of virtual machines across physical machines. In this paper, give the detailed explanation of existing and relevant methodologies for energy efficient cloud data centers. Also explain limitations of existing methodologies and techniques.