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Introduction to Cloud Computing

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Submitted By rajashreek4
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The beauty of Cloud Computing lies in the ability to visualize computing as a utility. It has the potential to transform a large part of IT industry, by providing software as a service and shaping the way hardware is designed and purchased. Upcoming developers with innovative ideas for new Internet services no longer require the large capital investments in hardware to deploy their services or the human expense to operate it. They need not be concerned about over provisioning for a service whose popularity does not meet their expectations, thus wasting costly resources, or under provisioning resources for a service which becomes wildly popular, thereby missing out on revenue. Furthermore, companies with large batch-oriented tasks can get results quickly as their programs can scale, since with cloud computing using 1000 servers for 1 hour costs no more than using 1 server for 1000 hours. Such elasticity, without large scale investment is unprecedented in the history of IT.
The National Institute of Standards and Technology (NIST) defines five basic characteristics of cloud computing, three service models and four deployment models. The five basic characteristics are:
• On Demand Service: The consumer can provision computing capabilities, such as server time and network storage, as and when needed without requiring human interactions with each service provider.
• Comprehensive Network Access: Capabilities that are available over the network can be accessed through standard mechanisms by thin or thick client platforms. Examples include mobile phones, tablets, laptops, workstations etc.
• Resource Pooling: The provider’s computing resources are pooled and multiple consumers share the same resources using a multi-tenant model. The different physical and virtual resources are dynamically assigned and reassigned according to consumer demand. The customer generally has…...

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