CMS Data Transfer operations after the first years of LHC collisions

被引：2

作者：

Kaselis, R. ^{[1
]}

Piperov, S. ^{[2
]}

Magini, N. ^{[3
]}

Flix, J. ^{[4
,5
]}

Gutsche, O. ^{[6
]}

Kreuzer, P. ^{[7
]}

Yang, M. ^{[8
]}

Liu, S. ^{[6
]}

Ratnikova, N. ^{[9
]}

Sartirana, A. ^{[10
]}

Bonacorsi, D. ^{[11
]}

Letts, J. ^{[12
]}

机构：

[1] Vilnius Univ Lithuania, Vilnius, Lithuania

[2] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria

[3] CERN, Zurich, Switzerland

[4] Port Informacio Cient, Valencia, Spain

[5] Ctr Invest Energet Mediaoambientales & Tecnol, Valencia, Spain

[6] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[7] Rheinisch Westfal Tech Hsch, Darmstadt, Germany

[8] MIT, Cambridge, MA 02139 USA

[9] Karlsruhe Inst Technol, Karlsruhe, Germany

[10] Ecole Polytech, Palaiseau, France

[11] INFN, Bologna, Italy

[12] Univ Calif San Diego, San Diego, CA 92103 USA

来源：

INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS 2012 (CHEP2012), PTS 1-6 | 2012年 / 396卷

关键词：

D O I：

10.1088/1742-6596/396/4/042033

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

CMS experiment utilizes distributed computing infrastructure and its performance heavily depends on the fast and smooth distribution of data between different CMS sites. Data must be transferred from the Tier-0 (CERN) to the Tier-1s for processing, storing and archiving, and time and good quality are vital to avoid overflowing CERN storage buffers. At the same time, processed data has to be distributed from Tier-1 sites to all Tier-2 sites for physics analysis while Monte Carlo simulations sent back to Tier-1 sites for further archival. At the core of all transferring machinery is PhEDEx (Physics Experiment Data Export) data transfer system. It is very important to ensure reliable operation of the system, and the operational tasks comprise monitoring and debugging all transfer issues. Based on transfer quality information Site Readiness tool is used to create plans for resources utilization in the future. We review the operational procedures created to enforce reliable data delivery to CMS distributed sites all over the world. Additionally, we need to keep data and meta-data consistent at all sites and both on disk and on tape. In this presentation, we describe the principles and actions taken to keep data consistent on sites storage systems and central CMS Data Replication Database (TMDB/DBS) while ensuring fast and reliable data samples delivery of hundreds of terabytes to the entire CMS physics community.

引用

页数：8

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