Data Reprocessing on Worldwide Distributed Systems
Daniel Wicke (Fermilab)
The D0 experiment faces many challenges in terms of enabling access to large datasets for physicists on 4 continents. The strategy for solving these problems on worlwide distributed computing clusters is presented.
Since the beginning of Run II of the Tevatron (March 2001) all Monte-Carlo simulations for the experiment are produced at remote systems. For data analysis, a system of regional analysis centers (RACs) was established which supply the associated institutes with the data. This structure, which is similar to the tiered structure foreseen for the LHC was used in Fall 2003 to reprocess all D0 data with a much improved version of the reconstruction software. This makes D0 the first running experiment that has implemented and operated all important computing tasks of a high energy physics experiment on systems distributed worldwide.
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