虚拟机可用性研究

发布时间：2018-05-01 01:19

本文选题：虚拟机可用性 + 影子页表　；参考：《小型微型计算机系统》2014年05期

【摘要】：针对虚拟机双机热备技术中,虚拟机服务响应延迟引起的可用性降低问题,通过对基于Xen的经典虚拟机可用性方案Remus的分析与总结,提出一种基于双影子页表实现零停机的方法.该方法基于Xen虚拟化平台,采用检查点机制,利用动态迭代传输思想实现主从虚拟机状态同步.将主虚拟机工作流程分为运行和同步两个阶段,在虚拟机双机热备期间采用两个影子页表:主影子页表和备用影子页表,两影子页表交替作为主页表和备用页表.运行阶段,主页表记录主虚拟机状态,并利用最近最常访问算法从中挑选最近最常页保存到备用页表,这样能够减少下次运行时影子页表的重建时间;同步阶段,主虚拟机不停机,备用页表转作主页表,原主页表作为备用页表实现主虚拟机与备份虚拟机的同步.实验结果表明,与Xen4.0中典型的虚拟机双机热备系统Remus相比,双影子页表实现零停机方法在虚拟机内存变化频繁时对主虚拟机可用性有明显的改进,降低延迟最高可达88.64%.
[Abstract]:In view of the problem of availability reduction caused by the response delay of virtual machine service in virtual machine hot standby technology, this paper analyzes and summarizes the classical virtual machine availability scheme Remus based on Xen. A method of zero stop based on double shadow page table is presented. This method is based on Xen virtualization platform, adopts checkpoint mechanism, and uses dynamic iterative transmission to realize state synchronization of master and slave virtual machines. The workflow of the primary virtual machine is divided into two stages: running and synchronizing. Two shadow page tables are used during the hot standby period of the virtual machine: the main shadow page table and the standby shadow page table, and the two shadow page tables are alternately used as the home page table and the standby page table. In the runtime, the home table records the status of the master virtual machine, and selects the most frequently used pages from the most recent access algorithm to save to the standby page table, which reduces the reconstruction time of the shadow page table at the next run time. The primary virtual machine is not shut down, the standby page table is transferred to the home page table, and the original home page table is used as the standby page table to realize the synchronization between the primary virtual machine and the backup virtual machine. The experimental results show that compared with Remus, a typical hot standby system for virtual machines in Xen4.0, the dual shadow page table has a significant improvement on the availability of the main virtual machine when the memory of the virtual machine changes frequently, and the maximum delay can be reduced to 88.64.
【作者单位】：郑州大学信息工程学院;河南财政税务高等专科学校信息工程系;
【分类号】：TP302

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