Optimizing the usage of multi-Petabyte storage resources for LHC experiments
D. Spiga, Domenico Giordano, Fernando Harald Barreiro Megino · 2012
In the last two years of Large Hadron Collider (LHC) [1] operation, the experiments have made a considerable usage of Grid resources for the data storage and offline analysis.To achieve the successful exploitation of these resources a significant operational human effort has been put in place and it is the moment to improve the usage of the available infrastructure.In this respect, the Compact Muon Solenoid (CMS) [2] Popularity project aims to track the experiment's data access patterns (frequency of data access, access protocols, users, sites and CPU), providing the base for the automation of data cleaning and data placement activity on Grid sites.As well, the popularity-based Site Cleaning Agent (Victor) has been developed to monitor the evolution in time of the used and pledged space and remove unused data replicas at full Tier-2s. PoS(EGICF12-EMITC2)107