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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(jì)算:系統(tǒng)實(shí)例與研究現(xiàn)狀幸陳康1.-,鄭緯民1’21(清華大學(xué)清華信息科學(xué)與技術(shù)國家實(shí)驗(yàn)室(籌),北京100084)2(清華大學(xué)計(jì)算機(jī)科學(xué)與技術(shù)系,北京100084)CloudComputing
2、:SystemInstancesandCurrentResearchCHENKangl·”.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,Tsinghu
3、aUniversity,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:Thispapersurveysthecurrenttechnologiesado
4、ptedincloudcomputingaswellasthesystemsinenterprises.Cloudcomputingcanbeviewedfromtwodifferentaspects.Oneisaboutthecloudinfrastructurewhichisthebuildingblockfortheuplayercloudapplication.Theotherisofcoursethecloudapplication.Thispaperfocusesonthecloudinfrastructureincludingthesy
5、stemsandcurrentresearch.Someattractivecloudapplicationsarealsodiscussed.Cloudcomputinginfrastructurehasthreedistinctcharacteristics.First.theinfrastructureiSbuiltontopoflargescaleclusterswhichcontainalargenumberofcheapPCservers.Second,theapplicationsareCO—designedwiththefundame
6、ntalinfrastructurethatthecomputingresourcescanbemaximallyutilized.Third,thereliabilityofthewholesystemisachievedbysoftwarebuildingontopofredundanthardwareinsteadofmerehardware.Allthesetechnologiesareforthetwoimportantgoalsfordistributedsystem:highscalabilityandhighavailability.
7、Scalabilitymeansthatthecloudinfrastructurecallbeexpandedtoverylargescaleeventothousandsofnodes.Availabilitymeansthattheservicesareavailableevenwhenquitcanumberofnodesfail.Fromthispaper,readerswillcapturethecurrentstatusofcloudcomputingaswellasitsfuturetrends.Keywords:cloudcompu
8、ting;distributedinfrastructure;distributedparadigm摘要:針