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1、AToolkitApproachtoPartiallyConnectedOperationDanDuchampColumbiaUniversityandAT&TLabsAbstractdard lesystemprotocols(e.g.,NFSversion2)runningonunmodi edUNIXhosts.TheworkPartiallyconnectedoperationisthecircumstancewasmotivatedbythefollowingpersonalexperi-inwhichthecommunicat
2、ionlinkbetweentwoence,whichprovidesanexampleofpartiallycon-computersisintermittent,eitherbychoiceorbe-nectedoperation.causeorfailure.ThispaperdescribesthedesignMyhomecomputerhasaleasedlineconnectionandperformanceofauserleveltoolkitthatistoanInternetserviceprovider(ISP);my
3、companysuitedtoaccessingthehomedirectoryofapar-usesadi erentISP.Inordertoavoidbeingasys-tiallyconnecteduserinabandwidth-ecientman-temadministrator,Iinitiallyusedmyhomecom-ner.puterasanXterminal,telnet-ingtothema-Comparedtocustom lesystemsforpartiallychinesatmyoce,Unfort
4、unately,networkre-connectedoperation,thetoolkitiseasiertodeploysponseishighlyvariable
5、waitingsecondsormin-andprovidesextradegreesof
exibilitybecauseitutesforkeystrokeechoisnotunusual,outagesrunsatuserlevelandusesthelocal lesystemforarefrequent(e.g.,severaltimesperevening)
6、anditscache.Thetoolkitmakesitpossibleforunal-sometimeslong(e.g.,anentireholidayweekend)
7、teredclientstoaccessNFS lesystemsexportedenoughsothatinteractiveoperationovertheIn-1byunalteredservers.ternetprovedimpractical.ThemaintenanceofconsistencybetweenclientIconsideredtwoalt
8、ernatives.Onewastocon-andserverisautomaticprovidedthatcertainas-tinueusingthehomecomputerasaterminal,di-sumptionsareupheld,theprimaryonebeingthatalinguptotheoce.Theotherwastomakethesharingislimitedinsuchawaythatthereisahomecomputerasself-containedaspossible.Mysinglelocu
9、sofupdate."Thatis,forextendedhomeislocatedinadi erentareacodefrommyperiods,updatesareappliedeithertotheclient'soce,sodialupaccrueslongdistancechargesbothcacheordirectlytotheserver,butnottobothper-callandper-minute;therefore,Ichosethesec-simultaneously.Thispatternofuseist
10、ypicalofaondalternative.user'shomedirectory.Iimplementedatoolkit"ofuser-levelprogramsPerformanc
