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1、萬方數(shù)據(jù)ISSN1000·9825．CODENRUXUEWJournalofSoftware，V01．20，No．5，May2009，PP．1337-1348doi：10．3724／SP．J．1001．2009．034930byInstituteofSoftware。theChineseAcademyofSciences．Allrightsreserved．云計算：系統(tǒng)實例與研究現(xiàn)狀幸陳康1．-，鄭緯民1’21(清華大學清華信息科學與技術(shù)國家實驗室(籌)，北京100084)2(清華大學計算機科學與技術(shù)系，北京100084)CloudComputing：SystemInstances
2、andCurrentResearchCHENKangl·”．ZHENGWei．Minl·2E·mail：jos@iseas．a(chǎn)c．enhttp：／／www．jos．org．cnTcl，F(xiàn)ax：+86．10—625625631(TsinghuaNationalLaboratoryforInformationScienceandTechnology，TsinghnaUniversity，BeUing100084，China)2(DepartmentofComputerScienceandTechnology，TsinghuaUniversity，Bering100084，China)+
3、Correspondingauthor：E-mail：ck99@mails．tsinghua．edu．cnChenl(’ZhengWM．Cloudcomputing：Systeminstancesandcurrentresearch．JournalofSoftware,2009，20(5)：1337—1348．http：／／www．jos．org．cn／1000—9825／3493．htmAbstract：Thispapersurveysthecurrenttechnologiesadoptedincloudcomputingaswellasthesystemsinenterpri
4、ses．Cloudcomputingcanbeviewedfromtwodifferentaspects．Oneisaboutthecloudinfrastructurewhichisthebuildingblockfortheuplayercloudapplication．Theotherisofcoursethecloudapplication．Thispaperfocusesonthecloudinfrastructureincludingthesystemsandcurrentresearch．Someattractivecloudapplicationsarealsodi
5、scussed．Cloudcomputinginfrastructurehasthreedistinctcharacteristics．First．theinfrastructureiSbuiltontopoflargescaleclusterswhichcontainalargenumberofcheapPCservers．Second，theapplicationsareCO—designedwiththefundamentalinfrastructurethatthecomputingresourcescanbemaximallyutilized．Third，therelia
6、bilityofthewholesystemisachievedbysoftwarebuildingontopofredundanthardwareinsteadofmerehardware．Allthesetechnologiesareforthetwoimportantgoalsfordistributedsystem：highscalabilityandhighavailability．Scalabilitymeansthatthecloudinfrastructurecallbeexpandedtoverylargescaleeventothousandsofnodes．A
7、vailabilitymeansthattheservicesareavailableevenwhenquitcanumberofnodesfail．Fromthispaper,readerswillcapturethecurrentstatusofcloudcomputingaswellasitsfuturetrends．Keywords：cloudcomputing；distributedinfrastructure；distributedparadigm摘要：針
