CERN Accelerating science

ATLAS Note
Report number	ATL-SOFT-PROC-2018-026
Title	ATLAS Distributed Computing: Its Central Services core
Author(s)	Lee, Christopher Jon (Cape Town U.) (+) ; Di Girolamo, Alessandro (CERN) ; Elmsheuser, Johannes (Brookhaven) ; Buzykaev, Alexey (Novosibirsk, IYF) ; Obreshkov, Emil (Texas U., Arlington) ; Glushkov, Ivan (Texas U., Arlington) ; Sun, Shaojun (U. Wisconsin, Madison (main))
Corporate Author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Publication	2019
Imprint	24 Nov 2018
Number of pages	6
In:	EPJ Web Conf. 214 (2019) 03061
In:	23rd International Conference on Computing in High Energy and Nuclear Physics, CHEP 2018, Sofia, Bulgaria, 9 - 13 Jul 2018, pp.03061
DOI	10.1051/epjconf/201921403061
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	The ATLAS Distributed Computing (ADC) Project is responsible for the off-line processing of data produced by the ATLAS experiment at the Large Hadron Collider (LHC) at CERN. It facilitates data and workload management for ATLAS computing on the Worldwide LHC Computing Grid (WLCG). ADC Central Services operations (CSOPS) is a vital part of ADC, responsible for the deployment and configuration of services needed by ATLAS computing and operation of those services on CERN IT infrastructure, providing knowledge of CERN IT services to ATLAS service managers and developers, and supporting them in case of issues. Currently this entails the management of 37 different OpenStack projects, with more than 5000 cores allocated for these virtual machines, as well as overseeing the distribution of 29 petabytes of storage space in EOS for ATLAS. As the LHC begins to get ready for the next long shut-down, which will bring in many new upgrades to allow for more data to be captured by the on-line systems, CSOPS must not only continue to support the existing services, but plan ahead for the expected increase in data, users, and services that will be required. This paper attempts to explain the current state of CSOPS as well as the strategies in place to maintain the service functionality in the long term.
Related document	Slides ATL-SOFT-SLIDE-2018-384
Copyright/License	preprint: © 2018-2025 CERN for the benefit of the ATLAS Collaboration (License: CC-BY-4.0) publication: © 2019-2025 The Authors (License: CC-BY-4.0)

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