1. CMS Usage of the Open Science Grid and the US Tier-2 Centers Ajit Mohapatra, University of Wisconsin, Madison (On Behalf of CMS Offline and Computing Projects) Centralised installation/maintainance of CMS Software package (CMSSW) at the OSG sites that participate in MC production. MC production is handled by CMS specific “ProdAgent” software and managed by several teams based at CERN and Wisconsin in LCG and OSG regions, respectively. Overall management of MC production and data transfer are performed by the CMS DataOps group. Production in OSG (including 7 CMS T2s in the US) are handled by ProdAgent servers based at Wisconsin. Utilization of various monitoring/debugging tools alongwith timely/effective communication with site admins has enabled us to run production efficiently. ProdAgent Condor submit Job JobRouter for OSG Job Routed to site X routing policy site X max Jobs max Idle site Y max Jobs max Idle … Condor Schedd Site XSite YSite Z GRAM CMS Analysis @ US T2s Routing CMS Jobs to OSGRunning/Idle Job Monitoring ProdAgent creates and hands over jobs to Condor. Summer08/Fall08/Winter09 Production Stats (LCG & OSG)Contribution of US (CMS) T2sJob Quality : US (CMS) T2s  OSG is a US based distributed computing grid for data-intensive research.  OSG goal is to promote collaboration in data-intensive research by providing a computing facility and services that integrate distributed, reliable and shared resources to support computation at all scales.  The computing and storage resources from campuses and research communities into a common, shared grid infrastructure via a common set of middleware.  Resources are owned and managed by the contributing members of OSG.  Among others, CMS T2 (and T3) sites in the US are members of the OSG. Analysis Jobs @ the T2s Summary & Plan  Data hosted by the T2s  User Analysis : CRAB (CMS Remote (Analysis Builder) Jobs Local Analysis Jobs  Private (user) production CMS MC Production in OSG Open Science Grid (OSG) MissionCMS Operations on OSGOSG Usage : CMS vs Others CMS (T1 + T2 + T3) MIT (44353) Wisc (434008) Nebraska (65711) Purdue(198128) Florida (159696) UCSD (312131) UCSD-b (261475) Caltech (176816)  Terminated jobs stats according to CMS dashboard June’ 08 - Feb’ 09 Caltech UCSD Jan’ 08 - Feb’ 09 ~ 1B evts T2_Region_FNAL (OSG) Summer08 / Fall08 / Winter09 & Part CSA07 / CSA08 ~ 2B evts Jan’ 08 - Feb’ 09 Computing in High Energy Physics, Prague (Czech Republic), March 2009 OSG provides packaged, tested and supported collections of software for the CEs and SEs for uniform operation across all the participating sites. OSG has already been used successfully for CMS MC production for last 2 years. Effective utilization of OSG (USCMS T2s) for MC production. All the US T2s have been very productive, stable and highly reliable. While OSG itself provides supports to sites for grid related operations, effective communication between sites and CMS production operators are important to address production issues at sites in timely manner. Expand the scope of MC production to CMS T3s (T3s are already used for user analysis) and other opportunistic resources which are also part of OSG.  Effective and reliable usage of site resources depends strongly on the support and timely response at/from the site.