The CMS data transfer test environment in preparation for LHC data taking

G. Bagliesi, L. Bauerdick, S. Belforte, K. Bloom, B. Bockelman, D. Bonacorsi, C. Brew, J. D'Hondt, R. Egeland, S. Elgammal, F. Fassi, I. Fisk, J. Flix, J. M. Hernandez, M. Kadastik, J. Klem, O. Kodolova, C. M. Kuo, J. Letts, J. MaesN. Magini, S. Metson, J. Piedra, N. Pukhaeva, G. Qin, P. Rossman, A. Sartirana, J. Shih, S. Sõnajalg, D. Teodoro, A. Trunov, L. Tuura, P. Van Mulders, T. Wildish, Y. Wu, F. Wiirthwein

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

The CMS experiment is preparing for LHC data taking in several computing preparation activities. In distributed data transfer tests, in early 2007 a traffic load generator infras-tructure was designed and deployed, to equip the WLCG Tiers which support the CMS Virtual Organization with a means for debugging, load-testing and commissioning data transfer routes among CMS Computing Centres. The LoadTest is based upon PhEDEx as a reliable, scalable dataset replication system. In addition, a Debugging Data Transfers (DDT) Task Force was created to coordinate the debugging of data transfer links in the preparation period and during the Computing Software and Analysis challenge in 2007 (CSA07). The task force aimed to commission most crucial transfer routes among CMS tiers by designing and enforcing a clear procedure to debug problematic links. Such procedure aimed to move a link from a debugging phase in a separate and independent environment to a production environment when a set of agreed conditions are ach eved for that link. The goal was to deliver one by one working transfer routes to Data Operations. The experiences with the overall test trans-fers infrastructure within computing challenges - as in the WLCG Common-VO Computing Readiness Challenge (CCRC'08) - as well as in daily testing and debugging activities are reviewed and discussed, and plans for the future are presented.

Original languageEnglish
Title of host publication2008 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2008
Pages3475-3482
Number of pages8
DOIs
StatePublished - 2008
Event2008 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2008 - Dresden, Germany
Duration: 19 Oct 200825 Oct 2008

Publication series

NameIEEE Nuclear Science Symposium Conference Record
ISSN (Print)1095-7863

Conference

Conference2008 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2008
Country/TerritoryGermany
CityDresden
Period19/10/0825/10/08

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