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1、SunDW,ChangGR,GaoSetal.Modelingadynamicdatareplicationstrategytoincreasesystemavailabilityincloudcomputingenvironments.JOURNALOFCOMPUTERSCIENCEANDTECHNOLOGY27(2):256{272Mar.2012.DOI10.1007/s11390-012-1221-4ModelingaDynamicDataReplicationStrategytoIncreaseSystemAvailabilityinCloudComputingEnvironmen
2、tsDa-WeiSun1(孙大为),StudentMember,CCF,ACM,Gui-RanChang2(常桂然),ShangGao3(高尚),Li-ZhongJin1(靳立忠),andXing-WeiWang1;¤(王兴伟),SeniorMember,CCF,ACM1SchoolofInformationScienceandEngineering,NortheasternUniversity,Shenyang110819,China2ComputingCenter,NortheasternUniversity,Shenyang110819,China3SchoolofEngineerin
3、gandInformationTechnology,DeakinUniversity,Geelong,Victoria3217,AustraliaE-mail:sundaweicn@163.com;chang@neu.edu.cn;shang.gao@deakin.edu.au;jinlizhongneusoft@yahoo.com.cn;wangxw@mail.neu.edu.cnReceivedJune17,2011;revisedJanuary29,2012.AbstractFailuresarenormalratherthanexceptionalinthecloudcomputin
4、genvironments.Toimprovesystemavai-lability,replicatingthepopulardatatomultiplesuitablelocationsisanadvisablechoice,asuserscanaccessthedatafromanearbysite.Thisis,however,notthecaseforreplicaswhichmusthavea¯xednumberofcopiesonseverallocations.Howtodecideareasonablenumberandrightlocationsforreplicasha
5、sbecomeachallengeinthecloudcomputing.Inthispaper,adynamicdatareplicationstrategyisputforwardwithabriefsurveyofreplicationstrategysuitablefordistributedcomputingenvironments.Itincludes:1)analyzingandmodelingtherelationshipbetweensystemavailabilityandthenumberofreplicas;2)evaluatingandidentifyingthep
6、opulardataandtriggeringareplicationoperationwhenthepopularitydatapassesadynamicthreshold;3)calculatingasuitablenumberofcopiestomeetareasonablesystembytee®ectiveraterequirementandplacingreplicasamongdatanodesinabalancedway;4)designingthedynamicdatareplicationalgorithminacloud.Experimentalresultsdemo
7、nstratethee±ciencyande®ectivenessoftheimprovedsystembroughtbytheproposedstrategyinacloud.Keywordssystemavailability,replicationperspective,highfaulttolerance,temporallocality,cloudcomputing1Introductionwhic
