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云计算定义
云计算与IT技术 云计算使用模式 云计算的影响
云计算对服务提供商意味着什么 云计算对于用户意味着什么 云计算基础设施基本特征 云计算的关联概念 云计算异军突起 效用计算
云计算和效用计算的比较 分布式计算 网格计算
云计算与网格计算的不同点 服务器集群 虚拟化
云计算存在的难题 云计算架构 云计算开源项目
使用云计算服务的风险 18
云计算定义
云计算是一种资源交付和使用模式，指通过网络获得应用所需的资源（硬件、平台、软件）。提供资源的网络被称为“云”。“云”中的资源在使用者看来是可以无限扩展的，并且可以随时获取。这种特性经常被比喻为像水电一样使用硬件资源，按需购买和使用。
Cloud computing definition
Cloud computing is a resource delivery and usage model, it means get resource (Hardware, software)via network. The network of providing resource is called ‘Cloud’. The hardware resource in the ‘Cloud’ seems scalable infinitely and can be used whenever.
云计算与IT技术
云计算是随着处理器技术、虚拟化技术、分布式存储技术、宽带互联网技术和自动化管理技术的发展而产生的. 这种大规模的计算能力通常是由分布式的大规模集群和服务器虚拟化软件搭建。
Cloud computing and technology
New advances in processors, virtualization technology, distributed storage, broadband Internet access , automated management and fast, inexpensive servers have all combined to make cloud computing a compelling paradigm.This vast process power is usually got with a distributed, large-scale server cluster and server virtualization software.
云计算使用模式
传统的计算模式下，单台台式机的资源用来完成任务。在客户服务器模式下，服务器用来执
行任务。在云计算模式下，网络超级计算机—“云”用来执行任务。用户能在任何时间任何地点通过互联网获取计算、存储、网络资源，并且能够按照处理器利用率、存储使用量、带宽消耗付费。
Cloud computing usage model
In traditional computing model, tasks are completed using a single desktop computer. In the client/serer model, tasks are completed using a remote server. In cloud computing model, tasks are completed using ‘Cloud’-a network super computer.Cloud computing allows users and companies to pay for and use the services and storage that they need, when they need them and, as wireless broadband connection options grow, where they need them. Customers can be billed based upon server utlilization, processing power used or bandwidth consumed.
云计算的影响
云计算有可能颠覆软件产业，应用和许可被随时购买和生效，应用在网络上而不是本机上运行。这种转变将数据中心放在网络的核心位置，而所有的应用所需要的计算能力、存储、带宽、电力都由数据中心提供。云计算不仅影响商业模式，还影响开发、部署、运行、交付应用的方式。
Cloud computing impact
As a result, cloud computing has the potential to upend the software industry entirely, as applications are purchased, licensed and run over the network instead of a user's desktop. This shift will put data centers and their administrators at the center of the distributed network, as processing power, electricity, bandwidth and storage are all managed remotely. It affects not only business models, but the underlying architecture of how we develop, deploy, run and deliver applications.
云计算对服务提供商意味着什么 快速部署 缩小主机规模 提高资源利用率 提高管理效率 降低运维成本
基础设施可以放置在低土地和能源成本的地区 提供商业连续性服务 提高服务水平 复杂的体系结构
商业模式和理念的转变
What cloud computing means to service provider? Fast Provision
Reduce servers scale
Increase resource utilization rate Improve management efficiency Lower maintenance cost
Location of infrastructure in areas with lower costs of real estate and electricity Provide business continuity service
Improve management efficiency Improve service levels Complex architecture
Change of business model and faith
云计算对于用户意味着什么 用户端负载降低 降低总体拥有成本
可能将应用的开发与基础设施维护相对分离 可能将程序代码与物理资源分离
不需要为一次性任务或罕见的负载状况准备大量设备 按需扩展资源
使应用具有高可用性 快速部署应用 按使用付费
What cloud computing means to suers? Lower client workload
Lower Total Cost Ownership
Separation of infrastructure maintenance duties from domain-specific application development ? Separation of application code from physical resources
Not have to purchase assets for one-time or infrequent intensive computing tasks Expand resource on-demand
Make the application have high availability Quickly deploy application Pay per use
云计算基础设施基本特征 自愈合 多用户使用 虚拟化 线形扩展
资源监控和测量 资源注册和发现
Cloud computing infrastructure features Self-healing Multi-tenancy Virtualized
Linearly Scalable
Resource Monitor and measure Resource registration and discovery
云计算的关联概念
云计算正成为行业中的热点概念。它和下面的词汇产生了或多或少的关连：网格计算，效用计算，虚拟化，服务器集群，主机租用，主机托管。云计算平台普遍用到了虚拟化技术，并