Cloud Computing is considered one of the emerging arenas of computer science in recent times. It is providing excellent facilities to business entrepreneurs through flexible infrastructure. There are lots of advantages the cloud computing technology like efficiency, reliability, flexibility, and security. This technology is growing day by day in Government, business as well as in education sectors. Though using Cloud Computing we have lots of opportunities in the IT industries and IT professionals are utilizing Cloud Computing in business models or other ways. We may not say that using cloud computing. Although cloud computing is facilitating the Information Technology industry, the research and development in this arena are yet to be satisfactory. Our contribution to this paper is an advanced survey focusing on the cloud computing concept and the most advanced research issues. This paper provides a better understanding of cloud computing and identifies important research issues in this burgeoning area of computer science.

Keywords : Cloud Computing; Virtualization; Data Centre; Server Consolidation