基于虚拟化技术的仿真系统容错优化方法.docx

基于虚拟化技术的仿真系统容错优化方法摘要：节点崩溃或者仿真资源不足导致的分布式仿真系统故障降低了仿真系统可靠性。为保证系统容错效果降低容错开销提出了一种基于虚拟化技术的仿真系统容错方法按照系统故障发生的位置对不同类型故障动态采用不同类型的容错策略。分析了检查点容错策略的优化方法给出了最优设置间隔；结合虚拟化技术的优势解决了副本容错策略的节点选择、副本数量以及位置分布问题；同时引入基于虚拟机迁移的容错策略并将其作为检查点容错策略和副本容错策略的补充以降低容错开销。通过仿真实验数据对比分析了动态容错策略与普通容错策略的性能可知动态容错策略保证了系统容错性能容错开销也保持在较低水平。关键词：仿真系统；容错；虚拟化；检查点；副本；虚拟机迁移中图分类号：TP311.52文献标志码：AOptimizedfaulttolerancemethodbasedonvirtualizationtechnologyinsimulatedsystemCHENZhijia*ZHUYuanchangDIYanqiangFENGShaochongDepartmentofElectronicsandOpticalEngineeringOrdnanceEngineeringCollegeShijiazhuangHebei050003ChinaAbstract：Thebreakdownofsimulationnodesorshortageofsimulationresourcescausefailureofdistributedsimulationsystemandlowerdownthereliabilityofsimulationsystem.Toimprovefaulttoleranceperformanceanddecreasetheoverheadoffaulttoleranceafaulttolerancemethodbasedonvirtualizationtechnologywasproposed.Accordingtodifferentfailurelocationsdifferentfaulttolerancemethodswereadopted.Theoptimizationofcheckpointstrategywasanalyzedandtheoptimalintervalwasobtained.Includingselectionofnodesthenumberofcopiesandthedistributionofthecopiesthreemainproblemsofbackupstrategywereconcluded.Theproblemsweresolvedthroughvirtualizationtechnology.Faulttolerancestrategybasedonvirtualmachinemigrationwasproposedasacomplementaryofcheckpointstrategyandbackupstrategytodecreasetheoverhead.Theperformanceofdynamicfaulttolerancestrategyandnormalfaulttolerancestrategywereevaluatedthroughexperiments.Theexperimentalresultsprovethattheproposedfaulttolerancetrategyisefficientandtheoverheadiskeptatalowlevel.Keywords：simulatedsystem；faulttolerance；virtualization；checkpoint；backup；virtualmachinemigration0引言随着分布式仿真系统中成员的增加和运行时间的推进仿真系统的可靠性逐渐下降故障率升高。关键仿真节点出现故障或者由于网络延时导致仿真状态不一致可能会导致仿真系统崩溃。若当前系统不具备一定容错能