Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 10: Instrumentation II

HK 10.4: Talk

Monday, March 30, 2020, 17:15–17:30, J-HS D

ALICE Tier 2 Centre and ALICE Analysis Facility prototype at GSI — •Sören Fleischer, Raffaele Grosso, Jan Knedlik, Paul-Niklas Kramp, and Kilian Schwarz — GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt

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 as well as our experience gained from recent changes. Those include using policy routing for ALICE-related traffic without XrootD proxy servers, improved monitoring of ALICE jobs using Grafana, as well as the migration to CentOS on the worker nodes and running the ALICE workload in Singularity containers. The build process of the latter has been implemented in a Gitlab Continuous Integration Pipeline, triggering a rebuild on every pushed commit to the definition file. The resulting container file is then run against a list of tests for known issues to reduce the chance of deploying a dysfunctional container.