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1、Surveyofdistributedfilesystem1.Codahttp://www.coda.cs.cmu.edu/http://linuxplanet.com/linuxplanet/tutorials/4481/1/TableofContentslIntroductionlPublicationsIntroductionTheCodadistributedfilesystemisastateoftheartexperimentalfilesystemdevelopedinthegroupofM.SatyanarayananatCarnegi
2、eMellonUniversity.NumerouspeoplecontributedtoCodawhichnowincorporatesmanyfeaturesnotfoundinothersystems:MobileComputing·disconnectedoperationformobileclientsoreintegrationofdatafromdisconnectedclientsobandwidthadaptation·FailureResilienceoread/writereplicationserversoresolutiono
3、fserver/serverconflictsohandlesofnetworkfailureswhichpartitiontheserversohandlesdisconnectionofclientsclient·Performanceandscalabilityoclientsidepersistentcachingoffiles,directoriesandattributesforhighperformanceowritebackcaching·Securityokerberoslikeauthenticationoaccesscontrol
4、lists(ACL's)·Welldefinedsemanticsofsharing·FreelyavailablesourcecodeCodawasoriginallyimplementedonMach2.6andhasrecentlybeenportedtoLinux,NetBSDandFreeBSD.MichaelCallahanportedalargeportionofCodatoWindows95,andwearestudyingWindowsNTtounderstandthefeasibilityofportingCodatoNTCurre
5、ntly,oureffortsareonportsandonmakingthesystemmorerobust.Afewnewfeaturesarcbeingimplemented(write-backcachingandcellsforexample),andinseveralareas,componentsofCodaarebeingreorganized.PublicationslBraam,P.J.TheCodaDistributedFileSystem.LinuxJournal,#50June1998lSatyanarayanan,M.Fun
6、damentalChallengesinMobileComputing.FifteenthACMSymposiumonPrinciplesofDistributedComputingMay1996,Philadelphia,PAlSatyanarayanan,M.MobileInformationAccess.IEEEPersonalCommunications,Vol.3,No.1,February1996lNoble,B.,Satyanarayanan,M.AResearchStatusReportonAdaptationforMobileData
7、Access.SIGMODRecord,Vol.24,No.4,December1995.lSatyanarayanan,M.Scalable,Secure,andHighlyAvailableDistributedFileAccess.IEEEComputerMay1990,Vol.23,No.5lSatyanarayanan,M.Coda:AHighlyAvailableFileSystemforaDistributedWorkstationEnvironment.ProceedingsoftheSecondIEEEWorkshoponWorkst
8、ationOperatingSystemsSep.1989,PacificGrove,CAlS
