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1、TeraGridDataPlan/Issues PhilAndrewsInXanadudidKublaKhan Astatelypleasure-domedecree: WhereAlph,thesacredriver,ran Throughcavernsmeasurelesstoman Downtoasunlesssea.-SamuelT.ColeridgeUsers’view:Dataisstoredsomewhere;itmustalwaysbeavailable,theremustalwaysberoomformore,itmustbeeasytoacce
2、ss,anditshouldbefastConveniencerequirementswillalwaysincrease.TeraGridQuarterly,Sep’07Eachgenerationofusersrequiresmoreconveniencethantheformer:thuswemustalwaysbeaddingnewlayersofsoftwarewhilemaintainingandextendingexistingreliabilityandcapability.ChangeistheonlyConstant–Heraclitis535
3、BC-475BCMajorUserDataAccess/TransferGridFTP:wellestablished;non-controversialabitclunkyandnotveryuser-friendly.Requiresschedulingextensionsforparalleluse.WANfilesystems:inherentlyparallel(ifenoughclientnodes)convenientandintuitive,usersliketheidea(Zimmermansurvey).Bigimpingementonloca
4、lsystemworldTeraGridQuarterly,Sep’07BothapproachesprogressingGridFTPgainingdirectaccesstoarchivalsystems,alreadythereforSAM-QFS,HPSSwithinstallationof6.2(laterin‘07).WorkingonschedulingextensionsforparalleltransfersWANfilesystemsbecomingintegratedwitharchivalsystems(GAforGPFS-HPSSlate
5、rthisyear,someLustre-HPSSinplace)TeraGridQuarterly,Sep’07Pontifications:AllarchivalsystemaccesswillbeindirectNo-onewillactuallyknowwheretheirdataisToday’smiddlewarecapabilities(replication,caching,etc.)willmigrateintoinfrastructure,newones(sblest.org,mutdb.org)willappearDataavailabili
6、tywillbemuchmoreimportantthanindividualcomputionalaccess.CostRecoverywillbeessentailTeraGridQuarterly,Sep’07'It'stoughtomakepredictions,"YogiBerraoncesaid,"especiallyaboutthefuture."Whatdoweneedtodo?MustextendWANfilesystemaccess.pNFSshouldeliminatelicensingissues,cachingextensionsshou
7、ldimprovereliabilityMustintegratedatacapabilitieswithintheTeraGrid,e.g.,federationofarchivalsystems,crossmountingoffilesystemsDatamustbetheequalofComputationPoliciesmustcatchupwithTechnologyTeraGridQuarterly,Sep’07Understandthatmostproblemsareagoodsign.Problemsindicatethatprogressisbe
8、ingma
