21-27 March 2009
Prague
Europe/Prague timezone

Operational Experience with CMS Tier-2 Sites

24 Mar 2009, 15:20
20m
Club B (Prague)

Club B

Prague

Prague Congress Centre 5. května 65, 140 00 Prague 4, Czech Republic
oral Hardware and Computing Fabrics Hardware and Computing Fabrics

Speaker

Dr Isidro Gonzalez Caballero (Instituto de Fisica de Cantabria, Grupo de Altas Energias)

Description

In the CMS computing model, about one third of the computing resources are located at Tier-2 sites, which are distributed across the countries in the collaboration. These sites are the primary platform for user analyses; they host datasets that are created at Tier-1 sites, and users from all CMS institutes submit analysis jobs that run on those data through grid interfaces. They are also the primary resource for the production of large simulation samples for general use in the experiment. As a result, Tier-2 sites have an interesting mix of organized experiment-controlled activities and chaotic user-controlled activities. CMS currently operates about 40 Tier-2 sites in 22 countries, making the sites a far-flung computational and social network. We describe our operational experience with the sites, touching on our achievements, the lessons learned, and the challenges for the future.

Primary author

Dr Isidro Gonzalez Caballero (Instituto de Fisica de Cantabria, Grupo de Altas Energias)

Presentation Materials