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ABSTRACT
Cloud computing is a category of computing solutions in which a technology and/or service lets users access computing resources on demand, as needed, whether the resources are physical or virtual, dedicated, or shared, and no matter how they are accessed without changing existing infrastructure. This paper introduces the background and principle of cloud computing, the character, style and actuality. This paper also introduces the application field the merit of cloud computing, such as, it do not need user's high level equipment, so it reduces the user's cost. It provides secure and dependable data storage center. It can realize data share through different equipments. This paper analyses some questions and hidden troubles, and puts forward some solutions, and discusses the utility of cloud computing and its future scope in the field of IT.
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I. Introduction
Cloud computing is TCP/IP based high development and integrations of computer technologies such as fast micro processor, huge memory, high-speed network and reliable system architecture. Without the standard inter-connect protocols and mature of assembling data center technologies, cloud computing would not become reality too. In October 2007, IBM and Google announced collaboration in cloud computing [1], The term "cloud computing" become popular from then on. Beside the web email, the Amazon Elastic Compute Cloud (EC2) [2], Google App Engine [3 ] and Salesforce's CRM [4] largely represent a promising conceptual foundation of cloud services. The services of cloud computing are broadly divided into three categories: Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS), and Software-as-a-Service (SaaS) [5,6]. Cloud computing also is divided into five layers including clients, applications, platform, infrastructure and servers. The five layers look like more reasonable and clearer than the three categories [7].
There are more than 20 definitions of cloud computing that seem to only focus on certain aspects of this technology [8]. Mean while, Oracle CEO L. Ellison thinks that cloud computing is nothing more than "everything that we currently do" [9]. There is a lot of confusion about what cloud computing really is and what kind of service can be deployed as cloud service. To a certain extent the definition of cloud computing is not important if it specify its characteristics. It is hard to predict who will win the war. It is also hard...