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Computing infrastructure for ATLAS data analysis in the Italian Grid cloud

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, , Citation A Andreazza et al 2011 J. Phys.: Conf. Ser. 331 052001 DOI 10.1088/1742-6596/331/5/052001

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1 INFN Milano and Università di Milano, Dipartimento di Fisica, via Celoria 16, IT-20133 Milano, Italy

2 INFN Laboratori Nazionali di Frascati, via Enrico Fermi 40, IT-00044 Frascati, Italy

3 INFN Genova and Università di Genova, Dipartimento di Fisica, via Dodecaneso 33, IT-16146 Genova, Italy

4 CERN, CH-1211 Geneva 23, Switzerland

5 INFN Napoli and Università di Napoli, Dipartimento di Scienze Fisiche, Complesso Universitario di Monte Sant'Angelo, via Cinthia, IT - 80126 Napoli, Italy

6 INFN-CNAF and INFN Sezione di Bologna, Viale Berti Pichat 6/2, IT-40127 Bologna, Italy

7 INFN Gruppo Collegato di Udine and Università di Udine, Dipartimento di Fisica, via delle Scienze 208, IT-33100 Udine

8 INFN Gruppo Collegato di Udine and Scuola Internazionale Superiore di Studi Avanzati, via Bonomea 265, IT-34136 Trieste, Italy

9 INFN Roma I and Università La Sapienza, Dipartimento di Fisica, Piazzale A. Moro 2, IT-00185 Roma, Italy

10 INFN Roma Tre and Università Roma Tre, Dipartimento di Fisica, via della Vasca Navale 84, IT-00146 Roma, Italy

11 INFN Pisa and Università di Pisa, Dipartimento di Fisica "E. Fermi", Largo B. Pontecorvo 3, IT-56127 Pisa, Italy

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1742-6596/331/5/052001

Abstract

ATLAS data are distributed centrally to Tier-1 and Tier-2 sites. The first stages of data selection and analysis take place mainly at Tier-2 centres, with the final, iterative and interactive, stages taking place mostly at Tier-3 clusters. The Italian ATLAS cloud consists of a Tier-1, four Tier-2s, and Tier-3 sites at each institute. Tier-3s that are grid-enabled are used to test code that will then be run on a larger scale at Tier-2s. All Tier-3s offer interactive data access to their users and the possibility to run PROOF. This paper describes the hardware and software infrastructure choices taken, the operational experience after 10 months of LHC data, and discusses site performances.

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10.1088/1742-6596/331/5/052001