Cloud Computing-New Vision to the World

Cloud computing is an emerging paradigm for large scale infrastructures. It has the advantage of reducing cost by sharing computing and storage resources, combined with an on-demand provisioning mechanism relying on a pay-per-use business model. A cloud is a large pool of resources, unified through virtualization or job scheduling techniques, these resources can be managed to dynamically scale up to match the load, using a pay-per-resources business model. The resources include hardware and systems software on remote data centres, as well as services based upon these that are accessed through the Internet. Key features advertised are elasticity, multi-tenancy, maximal resource utilization and pay-per-use.

These new features provides the means to leverage large infrastructures like data centres, through virtualization or job management and resource management, but these large pools of resources are not necessarily located in the same country nor even on the same continent.

Cloud provides Platform as a Service (PaaS), Software as a Service (SaaS) and Infrastructure as a Service (IaaS). Basically cloud architecture contains three layers service provider, cloud provider and organization or end user. In market different cloud provider present today. We focus on cloud architecture, security issues in cloud and to solve them.