Fault Tolerance.ppt


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,Berkeley,,Finland,,XiuwenLiuatFloridaStateUniversityIhavemodifiedthemandaddednewslidesGivingcreditwherecreditisdue:CSCE455/855DistributedOperatingSystemsFaultToleranceChapter8PartIIntroductionFaultToleranceADSshouldbefault-tolerantShouldbeabletocontinuefunctioninginthepresenceoffaultsFaulttoleranceisrelatedtodependabilityDependabilityDependabilityIncludesAvailabilityReliabilitySafetyMaintainabilityAvailability&Reliability(1)Availability:AmeasurementofwhetherasystemisreadytobeusedimmediatelySystemisupandrunningatanygivenmomentReliability:AmeasurementofwhetherasystemcanruncontinuouslywithoutfailureSystemcontinuestofunctionforalongperiodoftimeAvailability&Reliability(2)Asystemgoesdown1ms/%,butisunreliableAsystemthatnevercrashesbutisshutdownforaweekonceeveryyearis100%reliablebutonly98%availableSafety&MaintainabilitySafety:AmeasurementofhowsafefailuresareSystemfails,nothingserioushappensForinstance,highdegreeofsafetyisrequiredforsystemscontrollingnuclearpowerplantsMaintainability:AmeasurementofhoweasyitistorepairasystemAhighlymaintainablesystemmayalsoshowahighdegreeofavailabilityFailurescanbedetectedandrepairedautomatically?Self-healingsystems?FaultsAsystemfailswhenitcannotmeetitspromises(specifications)AnerrorispartofasystemstatethatmayleadtoafailureAfaultisthecauseoftheerrorFault-Tolerance:thesystemcanprovideserviceseveninthepresenceoffaultsFaultscanbe:Transient(appearonceanddisappear)Intermittent(appear-disappear-reappearbehavior)AloosecontactonaconnectorintermittentfaultPermanent(appearandpersistuntilrepaired)FailureModelsTypeoffailureDescriptionCrashfailureAserverhalts,butisworkingcorrectlyuntilithaltsOmissionfailure Receiveomission ingrequests ingmessages Aserver

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  • 时间2019-11-12