München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Instrumentation IV

HK 15.3: Talk

Monday, March 18, 2019, 17:15–17:30, HS 12

ALICE Tier 2 Centre and ALICE Analysis Facility prototype at GSI — •Sören Fleischer, Raffaele Grosso, Jan Knedlik, Paul-Niklas Kramp, and Kilian Schwarz for the ALICE collaboration — GSI, Darmstadt, Deutschland

Since 2004 GSI has been operating a Tier 2 Center for the ALICE experiment on the local shared computing cluster, currently located in the Green IT Cube. In this contribution we describe the current status of the center and important changes within the past year, including improvements in the high-level monitoring of ALICE Grid (AliEn) jobs and further virtualisation of XRootD redirectors. In parallel, a working prototype of an ALICE Analysis Facility (AF) has been set up at GSI. The effectiveness of XRootD plug-ins developed at GSI is presented. The RedirLocal plug-in allows local clients to directly access files on the local file system, bypassing the XRootD data servers and thus making local data access faster and more scalable compared to using default Grid methods. The SymLink plug-in allows local clients to access local files by their logical name as available on the AliEn File Catalogue, without accessing the latter. Performance tests using standard ALICE analysis trains running on the current test setup suggest that the target data throughput of 100 GB/s for an ALICE Analysis Facility will be achievable. Furthermore, the ALICE AF prototype has allowed to successfully test the usage within AliEn jobs of the Dynamic Deployment System (DDS), a toolset for effective deployment of distributed processes, developed at GSI.