云计算环境下虚拟机服务质量保证和评估方法:研究综述

A survey of approaches for QoS guarantee measurement of virtual machines in cloud computing environment

云计算是一种按需付费的资源使用模式.它通过虚拟化技术,向用户提供具有服务质量保证的计算、存储以及网络资源.然而,与物理服务器相比,虚拟化环境的特点使得虚拟机的服务质量(Quality of Service,Qo S)难以保证,例如,虚拟化技术本身的限制、虚拟机上所运行的应用的行为难以被准确预测、虚拟机性能评估困难、以及虚拟机行为监控困难等.分析上述困难,阐述学界对虚拟机服务质量保证的研究现状,总结对易于量化的Qo S指标及难以量化的Qo S指标的评估和保证方法.最后,总结与虚拟机Qo S相关的问题,并展望未来的研究方向和亟待解决的问题.

Cloud computing is a pay-as-you-go resource usage schema.It provides the quality of service （QoS） guaranteed computing, storage and the network resources via the virtualization technologies. However, there are some difficulties for virtual machine QoS assurance during the process of resource provision due to the virtualized environments.For example, it is limited by the virtualization technologies themselves, and difficult to predict the behavior of applications run on virtual machines. Meanwhile, it is difficult to predict the performance of virtual machines and also difficult to monitor their behaviors. Our work first elaborates on these difficulties, and then analyzes the state-of-the-art studies on the QoS assurance of virtual machines.Finally, we summarized the QoS related problems of virtual machines.We further discuss the future research issues and critical problems that need to be solved.