云计算的基本原理tobecontinued.pptVIP

Larry Ellison, Oracle CEO “The interesting thing about cloud computing is that we’ve redefined cloud computing to include everything that we already do... The computer industry is the only industry that is more fashion-driven than women’s fashion. .. It’s complete gibberish（胡言乱语）. It’s insane（愚蠢的）. When is this idiocy（白痴的行为） going to stop? Why Larry Ellison hates Cloud computing? Richard Stallman Father of the Free Software Movement “It‘s [Cloud Computing] stupidity. It’s worse than stupidity: it’s a marketing hype（大肆宣传） campaign. Somebody is saying this is inevitable--and whenever you hear somebody saying that, it’s very likely to be a set of businesses campaigning to make it true.” Commission of the European Communities Commission of the European Communities, Information Society Media Directorate-General, Software Service Architectures, Infrastructures and Engineering Unit. a cloud is an elastic execution environment of resources involving multiple stakeholders and providing a metered service at multiple granularities for a specified level of quality (of service). The NIST Definition of Cloud Computing Institute of Standards and Technology Cloud computing is a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction. Software as a Service (SaaS) A model of software deployment whereby a provider licenses an application to customers for use as a service on demand Platform as a Service (PaaS) 对于开发Web Application和Services，PaaS提供了一整套基于Internet的，从开发、测试、部署、运营到维护的全方位的集成环境。特别它从一开始就具备了Multi-tenant architecture，用户不需要考虑多用户并发的问题，而由platform来解决，包括并发管理、扩展性、失效恢复和安全等。 Utility Computing “Pay-as-you-go” 好比让用户把电源插头插在墙上，你得到的电压和Microsoft得到的一样，只是你用得少，pay less；utility computing的目标就是让计算资源也具有这样的服务能力，用户可以使用500强公司所拥有的计算资源，只是use less pay less。这是cloud comput