Activities and performance optimization of the Italian computing centers supporting the ATLAS experiment

With this work we present the activity and performance optimization of the Italian computing centers supporting the ATLAS experiment forming the so-called Italian Cloud. We describe the activities of the ATLAS Italian Tier-2s Federation inside the ATLAS computing model and present some Italian original contributions. We describe StoRM, a new Storage Resource Manager developed by INFN, as a replacement of Castor at CNAF - the Italian Tier-1 - and under test at the Tier-2 centers. We also show the failover solution for the ATLAS LFC, based on Oracle DataGuard, load-balancing DNS and LFC daemon reconfiguration, realized between CNAF and the Tier-2 in Roma. Finally we describe the sharing of resources between Analysis and Production, recently implemented in the ATLAS Italian Cloud with the Job Priority mechanism.

[1]  Hans F. Hoffmann.  The Lhc Computing Grid , 2004 .

[2]  E. Lanciotti,et al.  Performance Studies of the StoRM Storage Resource Manager , 2007, Third IEEE International Conference on e-Science and Grid Computing (e-Science 2007).

[3]  Claudia Ciocca,et al.  Deployment of job priority mechanisms in the Italian Cloud of the ATLAS experiment , 2010 .

[4]  T Maeno,et al.  PanDA: distributed production and distributed analysis system for ATLAS , 2008 .

[5]  Pier Paolo Ricci,et al.  LHCb experience with LFC replication , 2008 .

[6]  Mario Lassnig,et al.  Managing ATLAS data on a petabyte-scale with DQ2 , 2008 .

[7]  Stefano Dal Pra,et al.  A lightweight high availability strategy for Atlas LCG File Catalogs , 2010 .

[8]  Pier Paolo Ricci,et al.  Commissioning of a StoRM based Data Management System for ATLAS at INFN sites , 2010 .

[9]  I Bird,et al.  LHC computing grid : Technical design report , 2005 .

[10]  Erwin Laure,et al.  Enabling Grids for e-Science : The EGEE Project , 2008, Grid 2008.

[11]  A. Soroko,et al.  Distributed analysis in ATLAS using GANGA , 2010 .

[12]  Ulf Mjörnmark,et al.  ATLAS computing: Technical Design Report , 2005 .

[13]  Johannes Elmsheuser,et al.  Ganga: A tool for computational-task management and easy access to Grid resources , 2009, Comput. Phys. Commun..

[14]  A. Cavalli,et al.  Geographical failover for the EGEE-WLCG grid collaboration tools , 2008 .

[15]  Johannes Elmsheuser,et al.  Functional and large-scale testing of the ATLAS distributed analysis facilities with Ganga , 2010 .

[16]  G. Aad,et al.  The ATLAS Experiment at the CERN Large Hadron Collide , 2008 .