文件名称:
Above the Clouds: A Berkeley View of Cloud Computing
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文件大小: 589kb
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上传时间: 2009-08-07
详细说明： Above the Clouds: A Berkeley View of Cloud Computing Michael Armbrust, Armando Fox, Rean Griffith, Anthony D. Joseph, Randy Katz, Andy Konwinski, Gunho Lee, David Patterson, Ariel Rabkin, Ion Stoica, and Matei Zaharia (Comments should be addressed to abovetheclou ds@cs.berkeley.edu) UC Berkeley Reliable Adaptive Distributed Systems Laboratory http://radlab.cs.berkeley.edu/ February 10, 2009 KEYWORDS: Cloud Computing, Utility Computing, Internet Datacenters, Distributed System Economics 1 Executive Summary Cloud Computing, the long-held dream of computing as a utility, has the potential to transform a large part of th IT industry, making software even more attractive as a service and shaping the way IT hardware is designed and purchased. Developers with innovative ideas for new Internet services no longer require the large capital outlay in hardware to deploy their service or the human expense to operate it. They need not be concerned about over provisioning for a service whose popularity does not meet their predictions, thus wasting costly resources, or under provisioning for one that becomes wildly popular, thus missing potential customers and revenue. Moreover, companie with large batch-oriented tasks can get results as quickly as their programs can scale, since using 1000 servers for on hour costs no more than using one server for 1000 hours. This elasticity of resources, without paying a premium fo large scale, is unprecedented in the history of IT. Cloud Computing refers to both the applications delivered as services over the Internet and the hardware and systems software in the datacenters that provide those services. The services themselves have long been referred to a Software as a Service (SaaS). The datacenter hardware and software is what we will call a Cloud. When a Cloud i made available in a pay-as-you-go manner to the general public, we call it a Public Cloud; the service being sold i Utility Computing. We use the term Private Cloud to refer to internal datacenters of a business or other organization not made available to the general public. Thus, Cloud Computing is the sum of SaaS and Utility Computing, but doe not include Private Clouds. People can be users or providers of SaaS, or users or providers of Utility Computing. W focus on SaaS Providers (Cloud Users) and Cloud Providers, which have received less attention than SaaS Users. From a hardware point of view, three aspects are new in Cloud Computing. 1. The illusion of infinite computing resources available on demand, thereby eliminating the need for Cloud Com puting users to plan far ahead for provisioning. 2. The elimination of an up-front commitment by Cloud users, thereby allowing companies to start small and increase hardware resources only when there is an increase in their needs. 3. The ability to pay for use of computing resources on a short-term basis as needed (e.g., processors by the hou and storage by the day) and release them as needed, thereby rewarding conservation by letting machines and storage go when they are no longer useful. ...展开收缩
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