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1、华中科技大学博士学位论文在线备份服务机制及容错模型研究姓名：王桦申请学位级别：博士专业：计算机应用技术指导教师：陈传波;周可20091028
华中科技大学博士学位论文由于在线备份服务系统比备份软件存在更多的技术问题，客观上更易产生异常，而主观上又要求更高的服务可信性，所以最后研究了在线备份服务系统的可信性问题。首先研究了可信性概念、可信性分析及改进理论，在此基础上，提出了容错在线备份服务模型（FOBSM），并用形式化语言Object-Z对FOBSM的各个组成构件进行了形式化建模，利用Object-Z的推理规则证明了FOBSM所具有的容错属性，该研究对在
2、线备份服务系统的容错设计具有指导意义。在上述研究的基础上，设计并实现了一个在线备份服务原型系统。关键词：在线备份服务，任务并行调度，数据组织，数据压缩，容错模型II
华中科技大学博士学位论文AbstractIncurrentinformationsociety,dataisthemostvaluableassetofanenterpriseororganization,thedamageofcrucialdatawillcausefatalstriketoenterprise.Inthemeantime,dataisveryvulnerableinfa
3、ceofnaturaldisaster,man-mademisoperations,virusandhackerattacks.Databackup,aneffectivemeansofdataprotection,isreceivingmoreandmoreattentionandapplication.WiththepopularityofcloudcomputingandSaaS(SoftwareasaService),backupservicegraduallysubstitutestraditionalbackupsoftware,andbe
4、cominganewresearchdirectioninstorageapplicationarea.Currently,backupsoftwareandservicemarketismonopolizedbyforeignproducts,itisofgreatsignificancetoguaranteetheinformationsecurityinchinabymeansofstudyingkeytechnologiesanddevelopingbackupservicesystemwithindependentintellectualpr
5、opertyrights.Aimingatthedatatransmissionandstorageloadbalanceofconcurrentdatastreamstransferringbetweenlargescaleusersandmultiplemediumnodes,thepaperinvestigatedtheconcurrencyschedulingtechnologyconductedbydirectorserver.Inthemacroscopiclevel,real-timeschedulingstrategyandwholet
6、imeschedulingstrategyareproposed,whichareusedtoconnectuserandtheappropriatestoragenodetoaccomplishdatatransmission,bothofthetwostrategiesandtheiradaptabilitiesareanalyzedandcompared;inthemicroscopiclevel,multithreadingmanagementmechanismisstudied,towardsthecurrentlyusedad-hocmod
7、e,aimprovedthreadpoolapproachispresented.Inordertoimprovetheefficiencyofmassivedatatransportationandstorage,thispaperinvestigatedthedataorganizationinthestorageserverandthedatacompressiontechnologycoveredbothbackupclientandstorageserver.Intermsofdataorganization,thestoragefilesa
8、crossnodesareindependent.Fileswithinanodecangro
