1 CHEP 2000, Roberto Barbera Grid activities at the ALICE Experiment TNC2002, On behalf of the ALICE GRID Working Group: G. Andronico (CT), T. Anticic (IRB), R. Barbera (CT), I.J.Bloodworth (Birmingham), M. Botje (NIKHEF), P. Buncic (CERN), F. Carminati (CERN), P. Cerello (TO), G. Chabratova (DUBNA), J. Cleymans (South Africa), J. G. Contreras (MERIDA), D. Di Bari (BA), D. De Girolamo (BA), J. Gosset (SACLAY), A. Grigoryan (Yerevan), M.L. Luvisetto (BO), P. Malzacher (GSI), M. Masera (CERN/TO), A. Masoni (CA), K. Mkoyan (Yerevan), D. Mura (CA), L. Nellen (UNAM), B. Nilsen (OSU), S.K. Pal (Calcutta), F. Pierella(BO), F. Rademakers (CERN), Y. Schutz (SUBATECH), E. Scomparin (TO), M. Sitta (TO), R. Turrisi (PD), D. Vicinanza (SA)

2 Roberto Barbera Outline Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration The ALICE Experiment Grid activities at ALICE: the past: tests with Globus the present: AliEn, PROOF and DataGrid tests the future: grid interoperability with AliEn Summary and conclusions TNC2002,

3 ~9 km LHC SPS CERN Roberto Barbera Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration The Large Hadron Collider TNC2002,

4 Roberto Barbera Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002, The 4 LHC Experiments

5 Roberto Barbera Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002, The ALICE Detector

6 TNC2002, Roberto Barbera The Quark Gluon Plasma Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration LHC (5.5 A TeV) The Big Bang The Little Bang

7 Roberto Barbera Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration 1/100 of a LHC ! Simulation and reconstruction of a full (central) Pb+Pb collision at LHC (about primary tracks!) takes about 24 hours of a top-PC and produces an output bigger than 2 GB. TNC2002,

8 Roberto Barbera Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration 2+ times the Eiffel Tower 600+ m ALICE data per year 2-3 Petabytes ! ˜ CD-ROM TNC2002,

9 Roberto Barbera Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration Yerevan CERN Saclay Lyon Dubna Capetown, ZA Birmingham Cagliari NIKHEF GSI Catania Bologna Torino Padova IRB Kolkata, India OSU/OSC LBL/NERSC Merida Bari Nantes ALICE computing sites today TNC2002, ~O(10 8 ) events/year ~O(10 3 ) batch and interactive users in 2006

10 Roberto Barbera Mb/s Tier 4 Tier2 Center 2.5/10 Gb/s Tier2 Center Tier 2 Computing model Monarc Project Institute Physics data cache 155/622 Mb/s Tier 3 UK Regional Center France Regional Center Italy Regional Center Germany Regional Center 622/2500 Mb/s Tier 1 Tier 0 ~1.25 GB/s Online System Online Farm CERN Computer Center Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002,

11 Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration Im the impatient ALICE user checking the availability of events Anywhere Tape Pool (CASTOR/ HPSS) Im the local site manager Disk Pool Run DB Linux farm + MRTG monitor Production site Im the PPR production manager Managers site Roberto Barbera Lay-out 2000/01 Mirror DB WWW/Carrot Cron WWW/ Carrot AliEn Reposit. Install/Update Globus EnginFrame MySQL PHP Bypass bbFTP TNC2002,

12 TNC2002, Web interface to login on The Grid Roberto Barbera Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration Utilities Web interface for job submission ! CPU LoadDisk space Network availability Book keeping system Only at Lyon LDAP server for ALICE (only in Italy)

13 Roberto Barbera AliEn: the ALICE grid prototype Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002,

14 Roberto Barbera AliEn architecture Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002,

15 Roberto Barbera AliEn authentication Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002,

16 Roberto Barbera First production with AliEn Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002,

17 Local Remote Selection Parameters Procedure PROOF CPU TagD B RD B Proc.C DB 1 DB 4 DB 5 DB 6 DB 3 DB 2 Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration Unsecure or SRP (SLAC) authentication today TNC2002, Roberto Barbera PROOF: Parallel ROOt Facility

18 Roberto Barbera Experiences with DataGrid Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002,

19 Roberto Barbera Experiences with DataGrid Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002,

20 Roberto Barbera Experiences with DataGrid Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002,

21 Roberto Barbera Experiences with DataGrid Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002, The first event on the EDG testbed Dec, 11, 2001

22 Roberto Barbera Automatic check of the Testbed Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002,

23 Roberto Barbera The future: AliEn as a meta-grid Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002, AliEn User Interface AliEn stackiVDGL stackEDG stack

Roberto Barbera Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002, Application: AliRoot Data Persistency: Root Job parallelisation: Root/PROOF Job submission/control/monitoring: AliEn Data Catalogue: AliEn AliRoot AliEn API/PROOF AliEn Services (shell, web) ROOT IVDGLEDG/EDT By P.Cerello Interfacing the Grid(s) - I

Roberto Barbera Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002, AliEn Job EDG RB EDG CE EDG WN AliEn Data Catalogue EDG SE Condor-G Alice Farm Alice User I-LFN I-PFN O-PFN O-LFN,O-PFN MetaData Catalogue By P.Cerello Interfacing the Grid(s) - II

Roberto Barbera Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002, EDG WN AliEn Data Catalogue EDG SE1 I-LFN(s) O-PFN3 I-PFN(s) I-PFN3 MetaData Catalogue I-LFN(s) EDG SE3 EDG SE2 EDG CE2 EDG CE3 I-PFN2 I-PFN1 O-PFN2 O-PFN1 PROOF By P.Cerello Interfacing the Grid(s) - III

27 Roberto Barbera Summary and conclusions Due to its huge needs in terms of distributed computing power and mass storage grids are for ALICE not just an interesting computer science technology but a real conditio sine qua non. Grid activities at ALICE are successfully developing since almost two years already. Since the beginning the ALICE attitude has been very positive and propositive. If you want to see ALICE jobs running on the grid come to the DataGrid stand in the demonstrations area. Dipartimento di Fisica dellUniversità di Catania and INFN Catania - Italy ALICE Collaboration TNC2002,