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1、WhatistheGrid?AThreePointChecklistIanFosterArgonneNationalLaboratory&UniversityofChicagofoster@mcs.anl.govJuly20,2002TherecentexplosionofcommercialandscientificinterestintheGridmakesittimelytorevisitthequestion:WhatistheGrid,anyway?Iproposehereathree-pointchecklistfordetermin
2、ingwhetherasystemisaGrid.IalsodiscussthecriticalrolethatstandardsmustplayindefiningtheGrid.TheNeedforaClearDefinitionGridshavemovedfromtheobscurelyacademictothehighlypopular.WereadaboutComputeGrids,DataGrids,ScienceGrids,AccessGrids,KnowledgeGrids,BioGrids,SensorGrids,Cluster
3、Grids,CampusGrids,TeraGrids,andCommodityGrids.TheskepticcanbeforgivenforwonderingifthereismoretotheGridthan,asonewagputit,a“fundingconcept”—and,asindustrybecomesinvolved,amarketingslogan.IfbydeployingascheduleronmylocalareanetworkIcreatea“ClusterGrid,”thendoesn’tmyNetworkFile
4、Systemdeploymentoverthatsamenetworkprovidemewitha“StorageGrid?”Indeed,isn’tmyworkstation,couplingasitdoesprocessor,memory,disk,andnetworkcard,a“PCGrid?”Isthereanycomputersystemthatisn’taGrid?UltimatelytheGridmustbeevaluatedintermsoftheapplications,businessvalue,andscientificr
5、esultsthatitdelivers,notitsarchitecture.Nevertheless,thequestionsabovemustbeansweredifGridcomputingistoobtainthecredibilityandfocusthatitneedstogrowandprosper.Inthisandotherrespects,oursituationissimilartothatoftheInternetintheearly1990s.Backthen,vendorswereclaimingthatprivat
6、enetworkssuchasSNAandDECNETwerepartoftheInternet,andotherswereclaimingthateverylocalareanetworkwasaformofInternet.ThisconfusedsituationwasonlyclarifiedwhentheInternetProtocol(IP)becamewidelyadoptedforbothwideareaandlocalareanetworks.EarlyDefinitionsBackin1998,CarlKesselmanand
7、Iattemptedadefinitioninthebook“TheGrid:BlueprintforaNewComputingInfrastructure.”Wewrote:“Acomputationalgridisahardwareandsoftwareinfrastructurethatprovidesdependable,consistent,pervasive,andinexpensiveaccesstohigh-endcomputationalcapabilities.”Ofcourse,inwritingthesewordswewe
8、renotthefirsttotalkabouton-demandaccesstocomputing,data,andservices.
