At the time of this conference, the ALICE experiment will have already data
from the LHC accelerator at CERN. ALICE uses AliEn to be able to distribute
and analyze all this data among the more than eighty sites that participate in
the collaboration. AliEn is a system that allows the use of distributed
computing and storage resources all over the world. It hides the differences
between the heterogeneous components, providing a simple and intuitive
interface to the end users. AliEn is also used by other high energy physics
experiments like CBM and PANDA.
AliEn has been improved over the last eight years to be able to cope with
computing projects like the ones of the LHC experiments. During this time, a
number of exercises of increasing scale and complexity have been performed to
evaluate if AliEn would be up to the challenge. All those exercises helped to
identify the components that needed to be improved. Finally, the time for
tests and exercises is over. This contribution will describe if AliEn was
ready for the data taking, and the main lessons that were learned once the
detector started collecting data.
S. Bagnasco, L. Betev, F. Carminati, O. Datskova, F. Furano, A. Grigoras, C.
Grigoras, S. Lee, P. Mendez Lorenzo, A. Peters, P. Saiz, S. Schreiner
firstname.lastname@example.org email@example.com, Alina Gabriela Grigoras firstname.lastname@example.org, Costin Grigoras Costin.Grigoras@cern.ch, Federico Carminati Federico.Carminati@cern.ch, Olga Vladimirovna Datskova email@example.com, Sehoon Lee firstname.lastname@example.org, Patricia Mendez Lorenzo Patricia.Mendez@cern.ch, Andreas Joachim Peters Andreas.Joachim.Peters@cern.ch, Steffen Schreiner Steffen.Schreiner@cern.ch, Fabrizio Furano Fabrizio.Furano@cern.ch