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With this work we present the activity and performance optimization of the Italian computing centers supporting the ATLAS experiment forming the so-called Italian Cloud. We describe the activities of the ATLAS Italian Tier-2s Federation inside the ATLAS computing model and present some Italian original contributions. We describe StoRM, a new Storage Resource Manager developed by INFN, as a replacement...
The four High Energy Physics (HEP) detectors at the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN) are among the most important experiments where the National Institute of Nuclear Physics (INFN) is being actively involved. A Grid infrastructure of the World LHC Computing Grid (WLCG) has been developed by the HEP community leveraging on broader initiatives (e.g...
High performance disk-storage solutions based on parallel file systems are becoming increasingly important to fulfill the large I/O throughput required by high-energy physics applications. Storage area networks (SAN) are commonly employed at the Large Hadron Collider data centres, and SAN-oriented parallel file systems such as GPFS and Lustre provide high scalability and availability by aggregating...
A key feature of grid environment is the sharing of computing and storage: users operate on resources not directly owned by them. Often users working on the same research project are grouped in a virtual organization (VO) to use a common authorization policy on this resources. Many international experiments, however, use different Grid middleware platforms with their own authorization framework. This...
Storage management is one of the most important enabling technologies for large-scale scientific investigations. Having to deal with multiple heterogeneous storage and file systems is one of the major bottlenecks in managing, replicating, and accessing files in distributed environments. Storage resource managers (SRMs), named after their Web services control protocol, provide the technology needed...
The ATLAS trigger and data acquisition system has been designed to use more than 2000 CPUs. During the current development stage it is crucial to test the system on a number of CPUs of similar scale. A dedicated farm of this size is difficult to find, and can only be made available for short periods. On the other hand many large farms have become available recently as part of computing grids, leading...
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