Cloud computing: State of the art reseach issues

Cloud computing has emerged as a new technology aimed to host computer resources and deliver appropriate services over the Internet. Cloud computing become attractive to IT industry by providing user requirements in pay as you go principle and increase resources only when service demand increases. However, despite the fact that cloud computing offers tremendous opportunities to the IT industry, there are still many issues still to be addressed in the development of cloud computing technology. In this paper, a review of cloud computing technology and its concepts, state-of-the-art implementation, brief architecture and research challenges have been investigated.