| Being considered as the third IT revolution following the PC and Internet, Cloud Computing may rewrite the states of IT and simultaneously cause concern by the Internet, IT and telecommunications industry. This lies in that Cloud computing is a fusion of the Internet business model, the revolutionary technology of the IT and telecommunications services operations. In recent years, the value of Cloud Computing is further recognized by the IT industry. After going through the hustle and bustle in the introduction period of the initial technology, Cloud Computing begins to enter a stage of explosive growth. The solutions and specific products for Cloud computing emerge in endlessly, the range of applications is extended gradually and many successful business case appear in this field of research. Large companies in Europe and America just like Google、Amazon、IBM、Microsoft et al. have been walking in the front, transforming one after another, and developing and operating different Cloud Computing products and servicesCloud Computing is not only the product to change business model with technological innovation-driven, also is the result of transformation of IT operations with user demand-driven. From the operator’s point of view, the original CPE taking on many tasks in Cloud Computing will gradually be liberated, and change into more simple and convenient. Through the unified deployment of cloud platforms and cloud client devices and systems Supporting the IT, communications and information services, The threshold will significantly reduce for Various types of users to use the traditional communication and IT services for collaborative working, learning and entertainment. For the users, the use of resources and access to services will be more and more low-cost and the convenience will greatly enhanced. Through the broadband access services provided by operators, users can access to cloud platform and enjoy a variety of cloud services at low cost anywhere, such as large-scale computing, information processing, application development, data storage and backup as well as applications and services payment in various subdivided market.Tn the distributed environment with network and IT infrastructure, Virtualization Technology provides technical support for successful operation of cloud computing. Achieving logical abstraction and unified representation of resources and carefully matching the scale of demand of the services for users, Virtualization Technology has outstanding advantages in the management of server, network and storage, greatly reduces management complexity, and improves resource utilization and operational efficiency. Therefore, controls the costs effectively. Currently, Xen and VMware are the mainstream vendors of virtualization service, and respectively provide Xen Live migration and VMware Vmotion dynamic migration tools, in order to achieve the deployment and migration of virtual machines.Dynamic migration of virtual machines is to migrate a virtual machine on a server to another server in real-time. In the migration process, virtual machines provide users with service without interruption in addition to a very short pause phase. Therefore, the dynamic migration of virtual machines becomes a solution to load balancing, server maintenance and migration work environment in cloud computing.However, at this stage, the migration scheduling of virtual machines is manual or semi-automatic. Scheduling efficiency is not high and affects the performance of virtual machine migration. In addition, the dynamic migration of virtual machines only migrate status of CPU, memory, network and I/O but not the disk data, instead of sharing storage devices by the way of SAN (storage area network) and NAS (network-attached storage). With the development of network technology and application requirements, there are huge demands to achieve live migration of whole-system for virtual machines including disk data under the shared storage or WAN environment.For the Characteristics and application requirements of Cloud Computing, on the basis of existing dynamically migrate framework for virtual machines, we optimize the scheduling strategies and data migration algorithm in this paper, and achieve the whole-system migration including disk data on the Xen virtualization architecture. The main advantages of this program as follows: firstly, monitoring real-time usage of cloud computing resources, automatically triggering the migration and completing highly efficient load balancing; for another, migration of disk data can be used in WAN environment, so enhancing the availability and dynamic scalability of cloud computing... |
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