The DØ experiment studies proton-antiproton collisions at the Tevatron collider based at Fermilab, Reprocessing, managing and distributing the large amount of real data coming from the detector as well as generating sufficient Monte Carlo data are some of the challenges faced by the DØ collaboration. SAMGrid combines the SAM datas handling system with the necessary job and information management allowing us to use the distributed computing resources in the various worldwide computing centers. This is one of the first large scale grid applications in High Energy Physics (in particular as we are using real data). After successful Monte Carlo production and a limited data reprocessing in the winter of 2003/04, the next milestone will be the reprocessing of the full current data set by this autumn/winter. It consists of ⁓500 TB of data, encompassing one billion events.
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