CMS grid activities in Europe

The CMS experiment at the CERN LHC collider is producing large amounts of simulated data in order to provide an adequate statistic for the Trigger System design. These productions are performed in a distributed environment, prototyping the hierarchical model of LHC computing centers developed by MONARC. A GRID approach is being used for interconnecting the Regional Centers. The main issues which are currently addressed are: automatic submission of data production requests to available production sites, data transfer among production sites, 'best-replica' location and submission of end-user analysis job to the appropriate Regional Center. In each production site different hardware configurations are being tested and exploited. Furthermore robust job submission systems, which are also able to provide the needed bookkeeping of the produced data, are being developed. BOSS (Batch Object Submission System) is an interface to the local computing center scheduling system that has been developed in order to allow recording in a relational database of information produced by the jobs running on the batch facilities. A summary of the current activities and a plan for the use of DataGrid PM9 tools are presented