随着云端服务的普及，企业和组织越来越依赖云平台进行数据存储、处理和管理。不同于传统网络计算，云端计算将大量计算资源集中在云平台上，客户端保留最小化的计算资源，特别是存储资源。虚拟机技术被广泛应用于云端资源的虚拟化、重新分配和管理中，特别是在私有云中。开源虚拟机技术如Xen受到学术界和商业界的广泛关注。
写了一堆，虽然精辟，但在都放在introduction里面也不合适，删吧。
放在这儿纪念一下。
For past years, numerous leading companies and academic groups have successfully established their own free and commercial cloud services, and encourage people and organizations to do everything online, such as data storage, processing and management[[i]]. People also become accustomed to using the computing resources of clouds just on “thin” devices, such as on netbooks, tablet computers (e.g. iPad) and cell phones.
Unlike traditional network computing, the client’s computer resources in cloud have been further concentrated in cloud platform [[ii]], and the Clients just remain minimal computing resources, especially storage resources. The storage capacities of iPhone4 and iPad just are 16-64GB, whereas a standard PC is 500GB-2TB.
Thus this novel networking computing architecture imposes higher requirements on the manageability of computing resources in cloud platforms.
On the other hand, virtual machine(VM) techniques have been widely used to virtualize, redistribute and manage the computing resources of the clouds, especially in private clouds, as a capital infrastructure of cloud computing. In the meantime, unlike the commercial products from VMware and Microsoft, open source VM techniques, such as Xen, have received extensive attention in many academic and commercial clouds.
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