The contribution of the WLCG Tier-2 site in Prague to the global WLCG operations

0552965 - ÚJF 2022 RIV IT eng C - Konferenční příspěvek (zahraniční konf.)
Adamová, Dagmar - Mikula, Alexandr - Adam, M. - Chudoba, Jiří - Vokáč, P. - Uhlířová, Jana
The contribution of the WLCG Tier-2 site in Prague to the global WLCG operations.
Proceedings of Science. Vol. 397. Trieste: Sissa Medialab srl, 2021, s. 1-5, č. článku 233. ISSN 1824-8039.
[Annual Conference on Large Hadron Collider Physics (LHCP2021) /9./. Paris (FR), 07.06.2021-12.06.2021]
Grant CEP: GA MŠMT(CZ) LTT17018
Výzkumná infrastruktura: CERN-CZ II - 90104; CESNET II - 90042
Institucionální podpora: RVO:68378271 ; RVO:61389005
Klíčová slova: ALICE collaboration * computing and storage services * information management
Obor OECD: Astronomy (including astrophysics,space science); Automation and control systems (FZU-D)
https://pos.sissa.it/397/233/pdf

Ever since the start of the LHC operations in 2009, the mission of processing, management and storage of data collected by the LHC experiments has been executed by the Worldwide LHC Computing Grid (WLCG). Building of the WLCG started at about 2001 and resulted in an extensive infrastructure of computing sites spread over 5 continents and interconnected with high capacity internet links. The current ecosystem comprises of ∼1 million constantly occupied computer cores, ∼1 ExaByte of storage and massive global networking with 10–100 Gb/s throughput. The computing centers involved in the WLCG are categorized as Tier 0, 1 and 2. Tier-0 is CERN, 14 Tier-1s are large computing centers providing computing power and disk and tape storage. Finally, there are 146 Tier-2 sites mostly universities and scientific institutes, which can store sufficient data and provide adequate computing power for simulation and analysis tasks. Tier-2s represent a very crucial part of the WLCG ecosystem delivering about half of the global WLCG resources. In this contribution we will present an overview of operations of the Tier-2 site in Prague, Czech Republic, which provides computing and storage services for experiments ALICE and ATLAS and also some non-LHC experiments. This overview will show the crucial role of Tier-2 sites in the WLCG considering how many are involved. Our computing center is of a distributed character: the main part of resources is installed at the Institute of Physics (IoP) of the Czech Academy of Sciences (CAS). a part of the XRootD storage cluster for ALICE is operating at the Nuclear Physics Institute (NPI) of the CAS. Smaller clusters of the computing servers are located at the Faculty of Mathematics and Physics of the Charles University, and in CESNET, an association of the Czech Research and Educational institutions. We will provide a detailed overview of the Prague Tier-2 site infrastructure and operations with a special focus on the services provided for the ALICE experiment.
Trvalý link: http://hdl.handle.net/11104/0328018