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1、CONCURRENCYANDCOMPUTATION:PRACTICEANDEXPERIENCEConcurrencyComputat.:Pract.Exper.2012;24:9921014Publishedonline9March2011inWileyOnlineLibrary(wileyonlinelibrary.com).DOI:10.1002/cpe.1715TowardsautonomicmanagementforCloudservicesbaseduponvolunteeredresourcesSim
2、onCaton1,∗,andOmerRana21InstituteforInformationSystemsandManagement,KarlsruheInstituteofTechnology,Englerstr.14,76131Karlsruhe,Germany2SchoolofComputerScience,CardiffUniversity,5TheParade,Roath,CardiffCF243AA,U.K.SUMMARYManyresearchinstitutionsandUniversities
3、owncomputationalcapacitythatisnoteffectivelyutilized,therebyprovidinganopportunityforsuchinstitutionstousesuchcapacitytoofferCloudservices(tobothinternalandexternalusers).However,theunreliabilityandunpredictabilityoftheseresourcesmeanthattheiruseinthecontexto
4、faServiceLevelAgreement(SLA)ishighrisk,leadingtoareductioninreputationaswellaseconomicpenaltiesincaseofSLAviolation.WeproposeamethodologythataddressestheissuesofunreliabilityandunpredictabilitysuchthatCloudsoftwareservicescouldbehosteduponvolunteeredresources
5、.Toenabletheharnessingoftheseresourceswerelyonautonomicfaultmanagementtechniquesthatallowsuchsystemstoindependentlyadapttheresourcestheyusebasedupontheirperceptionofindividualresourcereliability.Usingourapproachwewereabletoscaleoutthebackendinfrastructureofth
6、eCloudserviceelastically(min30sperworker),opportunisticallyandautonomically.Weaddresstwokeyquestionsinthisarticle:canacampusvolunteerinfrastructurebeusedinCloudprovisioning?Whatmeasuresarenecessaryinordertoensurereliabilityattheresourcelevel?Copyright2011Joh
7、nWiley&Sons,Ltd.Received18November2010;Accepted18January2011KEYWORDS:volunteerCloudcomputing;autonomicfaultmanagement;Matlab;Condor1.INTRODUCTIONUniversitiesandotherlargeinstitutionshavesharedcomputationalresources(CardiffUniversityhasforexamplearound80001000
8、0workstations),manyofwhichremainidleandunderutilizedforsignificantperiodsoftimeoftenbetween5and40%[13].TheeverincreasingpopularityofCloudComputingwhereservicesareprovided,typicallyforsomee
