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1、JInternetServAppl(2010)1:718DOI10.1007/s13174-010-0007-6ORIGINALPAPERSCloudcomputing:state-of-the-artandresearchchallengesQiZhang·LuCheng·RaoufBoutabaReceived:8January2010/Accepted:25February2010/Publishedonline:20April2010©TheBrazilianComputerSociety2010AbstractCloudcomputinghasrecentlyemergeda
2、sanewcalledcloudcomputing,inwhichresources(e.g.,CPUandparadigmforhostinganddeliveringservicesovertheInter-storage)areprovidedasgeneralutilitiesthatcanbeleasednet.CloudcomputingisattractivetobusinessownersasitandreleasedbyusersthroughtheInternetinanon-demandeliminatestherequirementforuserstoplana
3、headforpro-fashion.Inacloudcomputingenvironment,thetraditionalvisioning,andallowsenterprisestostartfromthesmallandroleofserviceproviderisdividedintotwo:theinfrastruc-increaseresourcesonlywhenthereisariseinservicede-tureproviderswhomanagecloudplatformsandleasere-mand.However,despitethefactthatclo
4、udcomputingofferssourcesaccordingtoausage-basedpricingmodel,andser-hugeopportunitiestotheITindustry,thedevelopmentofviceproviders,whorentresourcesfromoneormanyin-cloudcomputingtechnologyiscurrentlyatitsinfancy,withfrastructureproviderstoservetheendusers.Theemer-manyissuesstilltobeaddressed.Inthi
5、spaper,wepresentagenceofcloudcomputinghasmadeatremendousimpactsurveyofcloudcomputing,highlightingitskeyconcepts,ontheInformationTechnology(IT)industryoverthepastarchitecturalprinciples,state-of-the-artimplementationasfewyears,wherelargecompaniessuchasGoogle,Ama-wellasresearchchallenges.Theaimoft
6、hispaperistopro-zonandMicrosoftstrivetoprovidemorepowerful,reliablevideabetterunderstandingofthedesignchallengesofcloudandcost-efficientcloudplatforms,andbusinessenterprisescomputingandidentifyimportantresearchdirectionsinthisseektoreshapetheirbusinessmodelstogainbenefitfromincreasinglyimportantar
7、ea.thisnewparadigm.Indeed,cloudcomputingprovidessev-eralcompellingfeaturesthatmakeitattractivetobusinessKeywordsCloudcomputing·Datacenters·Virtualizationowners,asshownbelow.Noup-frontinvestment:Cloudcomputingusesapay-as-you-
