Goals of Data Challenges
About two years ago
ATLAS computing planned first series of Data
Challenges in order to validate its Computing Model, its software,
its data model, and to ensure the correctness of the technical choices
to be made. Since then, and particulary in the context of the CERN Review
of LHC Computing, the scope and goals of these data challenges has evolved.
It is now clear that these Data Challenges should be executed at the prototype
Tier centres wich will be built in the Phase1 of the LHC Computing Grid
the Data Chalenges will be run on Linux systems operating at close to the
CERN certified level.
Data Challenge 0: To simulate and reconstruct
samples of the order of 100k "Z+jet" events, or similar. In order to test
the database technology, Objectivity, the simulated data will be converted
to Objectivity before the reconstruction step.
Data Challenge 1: It will be to divided in
to phases. In the first phase they will generate several data sets, some
large as 107 events. The second phase will also produce some
physics samples but will be more oriented to the thesting of the new software,
including Geant4, the new event data model and the evaluation of two databases
technologies, Objectivity and Root-I/O. The volume of data to be generated
should be of the order of 20-30 TB.
Data Challenge 2: Samples of 108
events will be generated, mainly in OO-databases, and with large-scale
physics analysis using Grid tools.
We want to participate in this year in the Data Challenge 1(DC1) with two
Event productions in our farm in order to provide samples for physics studies
and make the Technical Design Report for the end of 2002.
To test in our farm the new software, including Geant4, the new event data
model and the evaluation of two database technologies, Objectivity and
In the Future we want to partcipate in the Data Challenge 2 (DC2). The
details of DC2 will depend on what has and has not been achieved in DC0/1.
The goals are the following.
Geant 4 simulation should play a major role in this DC,
extensive use of the GRID middleware,
calibration and alignment procedures should be tested.
Técnicos RedIRIS (Madrid, June 2002)