Speaker
José Flix
Description
The CMS experiment has adopted a computing system where resources are distributed worldwide in more than 50 sites. The operation of the system requires a stable and reliable behavior of the underlying infrastructure. CMS has established procedures to extensively test all relevant aspects of a site and their capability to sustain the various CMS computing workflows at the required scale. The Site Readiness monitoring infrastructure has been instrumental in understanding how the system as a whole was improving towards LHC operations, measuring the reliability of sites when running CMS activities, and providing sites with the information they need to solve eventual problems. This paper reviews the complete automation of the Site Readiness program, with the description of monitoring tools and their inclusion into the Site Status Board (SSB), the performance checks, the use of tools like HammerCloud, and the impact in improving the overall reliability of the Grid from the point of view of the CMS computing system. Based on these results, CMS automatically excludes sites to conduct workflows, in order to maximize workflows efficiencies. The performance against these tests seen at the sites during the first years of LHC running will be as well reviewed.
Authors
Dr
Andrea Sciaba
(CERN)
José Flix
Co-authors
Chris Brew
(Particle Physics-Rutherford Appleton Laboratory-STFC - Science &)
Giuseppe Bagliesi
(Sezione di Pisa (IT))
Kenneth Bloom
(University of Nebraska (US))
Peter Kreuzer
(Rheinisch-Westfaelische Tech. Hoch. (DE))
