Fermilab Computing Division

CS Document 461-v1

Data Rereprocessing on Worldwide Distributed Sytems

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JoAnn Larson
Updated by:
JoAnn Larson
Document Created:
05 Aug 2004, 11:38
Contents Revised:
22 Sep 2004, 10:50
Metadata Revised:
29 Sep 2004, 13:47
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05 Aug 2004, 11:38
The DØ experiment faces many challenges enabling access to large datasets for physicists on 4 continents. The strategy of solving these problems on worlwide distributed computing clusters is followed.

Already since the begin of TEvatron RunII (March 2001) all Monte-Carlo simulations are produced outside of Fermilab at remote systems. For analyses as system of regional analysis centers (RACs) was established which supply the associated institutes with the data. This structure which is similar the the Tier structure foreseen for LHC was used in autumn
2003 to rereprocess all DØ-data with the uptodate and
much improved recontruction software.

As the first running experiment DØ has implemented and operated all important computing dask of a high energy physics experiment on worldwide distributed systems.

The experiences gained in DØ can be applied to judge the LHC
computing model.

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CHEP2004 held from 27 Sep 2004 to 01 Oct 2004 in Interlaken, Switzerland
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