Operational experience with CMS Tier-2 sites

In the CMS computing model, more than 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...

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Bibliographic Details
Published in:Journal of physics. Conference series 2010-04, Vol.219 (5), p.052003
Main Authors: Caballero, I González, Collaboration, the Cms
Format: Article
Language:English
Subjects:
Computation
Physics
Social networks
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Summary:In the CMS computing model, more than 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.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/219/5/052003