CHEP 07

Experience Running a Distributed Tier-2 for the ATLAS Experiment

3 Sept 2007, 08:00

10h 10m

Victoria, Canada

Board: 94

poster Computer facilities, production grids and networking Poster 1

Speaker

Mr LUIS MARCH (Instituto de Fisica Corpuscular)

Description

The Spanish ATLAS Tier-2 is geographically distributed between three HEP institutes. They are IFAE (Barcelona) and IFIC (Valencia) and UAM (Madrid). Currently it has a computing power of about 400 kSI2k CPU, a disk storage capacity of 40 TB and a network bandwidth connecting the three sites and the nearest Tier-1 of 1 Gb/s. These resources will increase with time in parallel to those of all the ATLAS Tier-2. They will be about 875 kSI2k CPU and 387 TB disk capacity at the LHC startup in 2008. The main roles of the Tier-2 are to provide resources for Production of Simulated Events and Physics Distributed Data Analysis. Since 2002, it has been participating to the different Data Challenge exercises. Currently, it is achieving around 1.5% of the whole ATLAS production in the framework of the Computing System Commissioning exercise. On the other hand, a prototype of Distributed Data Analysis system is being tested, integrated, and deployed. Distributed Data Management is also arising as an important issue in the daily activities of the Tier-2. The distribution in three sites has shown to be useful due to an increasing service redundancy, a faster solution of problems and the share of computing expertise and know-how. Experience gained running the Distributed Tier-2 and the preparations to perform successfully at the LHC startup will be presented.