TheColliderDetectoratFermilab(CDF)experimentrecordsandanalysesproton-antiprotioninteractionsatacenter-of-massenergyof2TeV,RunIIoftheFermilabTevatronstartedinAprilofthisyear,Thedurationoftherunisexpectedtobeovertwoyears.OneofthemaindatahandlingstrategiesofCDFforRUnIIistohidealltapeaccessfromtheuserandtofacilitatesharingofdataandthusdiskspace,Adiskinventorymanagerwasdesignedanddevelopedoverthepastyearstokeeptrackofthedataondisk.tocoordinateuseraccesstothedata,andtostagedatabackfromtapetodiskasneeded.TheCDFRunIIdiskinventorymanagerconsistsofaserverprocess,auserandadministratorcommandlineinterfaces.andalibrarywiththeroutinesoftheclientAPI.Dataaremanagedinfilesetswhicharegroupsofoneormorefiles.Thesystemkeepstrackofuseracesstothefilesetsandattemptstokeepfrequentlyaccesseddataondisk.Datathatarenotondiskareautomaticallystagedbackfromtapeasneeded.ForCDFthemainstagingmethodisbasedonthemt-toolspackageastapesarewrittenaccordingtotheANSIstandard.
