Abstract
The Large Hadron Collider (LHC) experiments will collect unprecedented data volumes in the next Physics run, with high pile-up collisions resulting in events that require a complex processing. Hence, the collaborations have been required to update their Computing Models to optimize the use of the available resources and control the growth of resources, in the midst of widespread funding restrictions, without penalizing any of the Physics objectives. The changes in computing for Run2 represent significant efforts for the collaborations, as well as significant repercussions on how the WLCG sites are built and operated.This paper focuses on these changes, and how they have been implemented and integrated in the Spanish WLCG Tier-1 centre at Port d'Informació Cientifica (PIC), which serves the ATLAS, CMS and LHCb experiments. The approach to adapt a multi-VO site to the new requirements, while maintaining top reliability levels for all the experiments, is as well presented. Additionally, a description of work done to reduce the operational and maintenance costs of the Spanish Tier-1 centre, in agreement with the expectations from WLCG, is provided.
Highlights
The Large Hadron Collider (LHC), at the European Laboratory for Particle Physics (CERN, Switzerland), started operating in November 2009
The largest scientific distributed computing infrastructure in the world adds up the computing resources of more than 170 centres in 34 countries to form the Worldwide LHC Computing Grid (WLCG [1][2])
Port d’Informacio Cientıfica (PIC) provides services to three of the LHC experiments, ATLAS, CMS and LHCb. It accounts for 5.1% of the total Tier-1 resources of ATLAS and CMS, and 6.5% for LHCb, acting as the reference Tier-1 for the Tier-2 centres in Spain and Portugal, and sites located in Valparaiso (Chile) and Marseille (France)
Summary
The LHC, at the European Laboratory for Particle Physics (CERN, Switzerland), started operating in November 2009. PIC provides services to three of the LHC experiments, ATLAS, CMS and LHCb. It accounts for 5.1% of the total Tier-1 resources of ATLAS and CMS, and 6.5% for LHCb, acting as the reference Tier-1 for the Tier-2 centres in Spain and Portugal, and sites located in Valparaiso (Chile) and Marseille (France). During LS1, the computing models of the experiments underwent a series of revision, in order to cope with the high data volume expected for the second LHC run, while keeping a controlled growth of computing resources elsewhere.
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