Fermilab Computing Division

CS Document 649-v1

Data Reprocessing on Worldwide Distributed Systems

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Daniel Wicke
Updated by:
Daniel Wicke
Document Created:
05 Jan 2005, 10:09
Contents Revised:
05 Jan 2005, 10:09
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05 Jan 2005, 10:09
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The D0 experiment faces many challenges in terms of enabling access to large
datasets for physicists on four continents. The strategy for solving these
problems on worldwide distributed computing clusters is presented. Since the
beginning of Run II of the Tevatron (March 2001) all Monte-Carlo simulations
for the experiment have been 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
DO 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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