cloudComputing - Cloud computing - Wikipedia, the free...

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Some of the vendors providing Cloud computing services Cloud computing From Wikipedia, the free encyclopedia Cloud computing is a paradigm of computing in which dynamically scalable and often virtualized resources are provided as a service over the Internet. [1][2] Users need not have knowledge of, expertise in, or control over the technology infrastructure in the "cloud" that supports them. [3] The concept generally incorporates combinations of the following: infrastructure as a service (IaaS) platform as a service (PaaS) software as a service (SaaS) Other recent (ca. 2007–09) [4][5] technologies that rely on the Internet to satisfy the computing needs of users. Cloud computing services often provide common business applications online that are accessed from a web browser, while the software and data are stored on the servers. The term cloud is used as a metaphor for the Internet, based on how the Internet is depicted in computer network diagrams and is an abstraction for the complex infrastructure it conceals. [6] The first academic use of this term appears to be by Prof. Ramnath K. Chellappa (currently at Goizueta Business School, Emory University) who originally defined it as a computing paradigm where the boundaries of computing will be determined by economic rationale rather than technical limits . [7] Contents 1 Brief 1.1 Comparisons 1.2 Characteristics 1.3 Economics 1.4 Architecture 2 History 3 Criticism and disadvantages 4 Political issues 5 Legal issues 6 Key characteristics 7 Components 7.1 Client 7.2 Service 7.3 Application 7.4 Platform 7.5 Infrastructure Page 1 of 15 Cloud computing - Wikipedia, the free encyclopedia 9/15/2009
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8 Architecture 9 Types 9.1 Public cloud 9.2 Hybrid cloud 9.3 Private cloud 10 Roles 10.1 Provider 10.2 User 10.3 Vendor 11 Standards 12 See also 13 References 14 External links Brief Comparisons Cloud computing can be confused with: grid computing—"a form of distributed computing whereby a 'super and virtual computer' is composed of a cluster of networked, loosely coupled computers, acting in concert to perform very large tasks"; 1. utility computing—the "packaging of computing resources, such as computation and storage, as a metered service similar to a traditional public utility such as electricity"; [8] and 2. autonomic computing—"computer systems capable of self-management". [9] 3. Indeed, many cloud computing deployments as of 2009 depend on grids, have autonomic characteristics, and bill like utilities—but cloud computing tends to expand what is provided by grids and utilities. [10]
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This note was uploaded on 03/01/2012 for the course CMP 426 taught by Professor Gwangs.jung during the Spring '12 term at CUNY Lehman.

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cloudComputing - Cloud computing - Wikipedia, the free...

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