Lets just begin with the basics of cloud computing.......
A cloud is a pool of virtualized computer resources
A cloud can:
• Host a variety of different workloads, including batch-style back-end jobs and interactive, user-facing applications • Allow workloads to be deployed and scaled-out quickly through the rapid provisioning of Virtual machines or physical machines
• Support redundant, self-recovering, highly scalable programming models that allow Workloads to recover from many unavoidable hardware/software failures
• Monitor resource use in real time to enable rebalancing of allocations when Cloud computing environments needed support grid computing by quickly providing physical and virtual Servers on which the grid applications can run. Cloud computing should not be confused with Grid computing. Grid computing involves dividing a large task into many smaller tasks that run in parallel on separate servers. Grids require many computers, typically in the thousands, and Commonly use servers, desktops, and laptops. Clouds also support no grid environments, such as a three-tier Web architecture running standard Or Web 2.0 applications. A cloud is more than a collection of computer resources because a Cloud provides a mechanism to manage those resources. History The Cloud is a metaphor for the Internet, derived from its common
depiction in network diagrams (or more generally components which are managed by others) as a cloud outline. The underlying concept dates back to 1960 when John McCarthy opined that "computation may someday be organized as a public utility" (indeed it shares characteristics with service bureaus which date back to the 1960s) and the term The Cloud was already in commercial use around the turn of the 21st century. Cloud computing solutions had started to appear on the market, though most of the focus at this time was on Software as a service.
2007 saw increased activity, including Google, IBM and a number of universities embarking on a large scale cloud computing research project, around the time the term started gaining popularity in the mainstream press. It was a hot topic by mid-2008 and numerous cloud computing events had been scheduled.
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