云计算中虚拟机动态迁移的研究

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1、‘计算中虚拟机动态迁移的研究摘要环境中资源的使用情况，自主发起动态迁移，以做到负载均衡。其次，能够在不同类型的虚拟机监控器问进行虚拟机的动态迁移，大大提高了动态迁移的灵活性。最后，能够对动态迁移的过程进行实时控制，避免迁移过程占用过多资源，从而保证虚拟机的SLA。为了验证上述方案的可行性，我们以两种具有代表性的开源虚拟机监控器Xen和KVM为基础实现了名为Vagrant的虚拟机动态迁移框架。实验结果表明，该框架能够根据负载情况，在Xen和KVM之间自主发起虚拟机动态迁移，同时能够对迁移过程进行实时控

2、制，保证虚拟机的SLA。在性能方面，由该迁移框架发起的虚拟机动念迁移的在迁移总时间上与传统的虚拟机动态迁移基本相当，而造成的停机时间基本在2秒以内。关键词：云计算，虚拟机监控器，动态迁移，服务等级协议(SLA)中图分类号：TP316VIAbstractThefastdevelopmentofcomputersoftwareandhardwareleadstotheevolutionofcomputingmodel．Afterdistributedcomputing，parallelcomputing

3、andgridcomputing，thecomputerindustryandacademeproposesanewcomputingmodel，cloudcomputing．Byintegratingnetworkedcomputingresourcesasavirtualresourcepool，cloudcomputingprovidesusersmassivecomputingresourcesasservice．Theserviceintegrationandon·demandsupply

4、providedbycloudcomputingCanimprovetheutilizationofcomputingresourcesandreduceper-serviceenergyevidently．Moreover,itcanshieldthefaultofcomputingresources．Incloudcomputing，resourcesaresharedandcallbereservedaccordingtousers’requests．Cloudcomputingplatfor

5、mhastoguaranteetomeetServiceLevelAgreement(SLA)iftheusers’requestshavebeenapproved．However,users’demandforresourcesusuallychangeswithtime．Eg，webserverhasdifferentworkloadindifferenttime．Reserveresourcestooearlywillinevitablycauselowresourceutilization．

6、Furthermore，whenusersaresharingresourcetransparently,cloudcomputingplatformhastodoloadbalancetoavoidhotspot．HowtoallocateresourcesefficientlyandmeetSLAatthesalTletimeisabigissueofcloudcomputing．Systemvirtualizationprovidesaneffectivewayforresourcemanag

7、ementincloudcomputing．Byencapsulatingservicesinvirtualmachines(VMs)whicharefinallymappedtophysicalservers，virtualizationCandoVMremappingaccordingtheworkload．LiveVMmigrationisagoodwaytodoVMremapping．Withthehelpofvirtualmachinemonitor(VMM)，whichliesbetwe

8、enoperatingsystemandhardware，liveVMmigrationmovesthewholeexecutionenvironment，includingoperatingsystem，fromonephysicalservertoanother．ItCanhelptheadministratortodoloadbalance，faulttoleranceandonlinemaintanence．Currently,liveVMmigrationi