云计算%3a系统实例与研究现状

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1、万方数据ISSN1000·9825．CODENRUXUEWJournalofSoftware，V01．20，No．5，May2009，PP．1337-1348doi：10．3724／SP．J．1001．2009．034930byInstituteofSoftware。theChineseAcademyofSciences．Allrightsreserved．云计算：系统实例与研究现状幸陈康1．-，郑纬民1’21(清华大学清华信息科学与技术国家实验室(筹)，北京100084)2(清华大学计算机科学与技术系，北京100084)Cl

2、oudComputing：SystemInstancesandCurrentResearchCHENKangl·”．ZHENGWei．Minl·2E·mail：jos@iseas．ac．enhttp：／／www．jos．org．cnTcl，Fax：+86．10—625625631(TsinghuaNationalLaboratoryforInformationScienceandTechnology，TsinghnaUniversity，BeUing100084，China)2(DepartmentofComputerScie

3、nceandTechnology，TsinghuaUniversity，Bering100084，China)+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：Thisp

4、apersurveysthecurrenttechnologiesadoptedincloudcomputingaswellasthesystemsinenterprises．Cloudcomputingcanbeviewedfromtwodifferentaspects．Oneisaboutthecloudinfrastructurewhichisthebuildingblockfortheuplayercloudapplication．Theotherisofcoursethecloudapplication．Thispa

5、perfocusesonthecloudinfrastructureincludingthesystemsandcurrentresearch．Someattractivecloudapplicationsarealsodiscussed．Cloudcomputinginfrastructurehasthreedistinctcharacteristics．First．theinfrastructureiSbuiltontopoflargescaleclusterswhichcontainalargenumberofcheap

6、PCservers．Second，theapplicationsareCO—designedwiththefundamentalinfrastructurethatthecomputingresourcescanbemaximallyutilized．Third，thereliabilityofthewholesystemisachievedbysoftwarebuildingontopofredundanthardwareinsteadofmerehardware．Allthesetechnologiesareforthet

7、woimportantgoalsfordistributedsystem：highscalabilityandhighavailability．Scalabilitymeansthatthecloudinfrastructurecallbeexpandedtoverylargescaleeventothousandsofnodes．Availabilitymeansthattheservicesareavailableevenwhenquitcanumberofnodesfail．Fromthispaper,readerswi

8、llcapturethecurrentstatusofcloudcomputingaswellasitsfuturetrends．Keywords：cloudcomputing；distributedinfrastructure；distributedparadigm摘要：针