云计算的安全架构与技术_第2节.ppt

Expected Benefits预期效益 Flexibility 灵活性 Freedom from concerns about updating servers Freedom from having to install software patches Automated provisioning of new services and technologies Acquiring increased resources on an as-needed basis Ability to focus on innovation instead of maintenance details Device independence * Expected Benefits预期效益 Reduced Costs (Q1) Centralization of Data Storage Reduced Time to Deployment (Q2) Scalability * Wu Tsu Yang创新信息产业研究中心 Cloud Computing Architecture云计算体系结构 Tsu-Yang Wu * SPI软件-平台-基础设施 model Generally, the classification scheme for cloud computing has been coined the SPI model Software-Platform-Infrastructure This acronym首字母缩写 represents the three major services provided through the cloud SaaS, PaaS, and IaaS SPI Evolution To understand how the SPI framework evolved, it’s helpful to place it in context with the development of Internet Service Providers互联网服务供应商 (ISPs). 1.0 As ISPs originally began to provide Internet services, dial-up modem service for homes and organizations proliferated, making the Internet a commercial commodity. * SPI Evolution 2.0 During a period of merging and consolidation, ISPs began offering other services, such as e-mail and off-site data storage. 3.0 The increasing demand for infrastructure to host their customers’ applications and data led to the creation of data centers Multiple customers could centralize their servers, storage, and communications systems on the ISP’s premises. * SPI Evolution 4.0 The commoditization商品化 of collocation facilities led to the development of application service providers应用服务提供商 (ASPs). 5.0 The ASP model eventually evolved into cloud computing New delivery models, such as the SPI framework, with its SaaS, PaaS, and IaaS Service models, and various deployment models, such as private, community, public, and hybrid cloud models. * SPI evolution through virtualization虚拟化 Data center evolution through basic virtualization into a full SPI framew