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LHCb T2D sites

LHCb T2D sites. A.Tsaregorodtsev, CPPM. Why T2D sites for LHCb. The T2D concept introduced in 2013 to allow non-T1 country sites to controbute storage to LHCb To allow well established T2 sites to contribute to the LHCb analysis activities The project is in a prototype state yet

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LHCb T2D sites

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  1. LHCb T2D sites A.Tsaregorodtsev, CPPM

  2. Why T2D sites for LHCb • The T2D concept introduced in 2013 • to allow non-T1 country sites to controbute storage to LHCb • To allow well established T2 sites to contribute to the LHCb analysis activities • The project is in a prototype state yet • 5 sites being tested • Incorporation into the LHCb production system • Monitoring, performance evaluation • Contacts • Based on initial testing a ( final ) draft of the LHCb T2D document is prepared • T2D site qualification criteria • Monitoring and performance • Support structures

  3. T2D qualification • Successful T2 sites with availability >95% in the last quarter • Storage system configured and tested as part of the LHCb data management procedure • Contact person is nominated • Not necessarily LHCb member • In contact with the national NCB representative • Adhere to the WLCG MoU requirement to respond to analysis problems ( 2 hours ). • Storage requirement • Minimum 100 TB to start with • Increase to 300 TB in the next year • LHCb-Disk space token • Connected to the LHCb FTS3 service • Support for xrootd with a fixed xrootd endpoint, SRM configured to return xrootd TURL

  4. T2D qualification • CPU requirement • 5 HEPSPEC’06 per TB of storage available to LHCb • 1.5 kHEPSPEC’06 for 300TB • Network connectivity • At least 1 Gbit/s to the national NREN • The T2D sites are available for analysis to all the LHCb users

  5. T2D sites monitoring • LHCb TWiKi T2D Comissioning page will be set up to monitor the site performance • https://twiki.cern.ch/twiki/bin/view/LHCb/T2DCommissioning • Sites will be requires to achieve 95% availability according to the WLCG T2 MoU criteria • If not achieved for a quarter in a row, site should provide a work plan to fix the issues or its T2D status can be revoked • The T2D sites will participate in the LHCb perfSonar monitoring • The site monitoring results will be published in the LHCb Site Status Board dashboard

  6. Support • LHCb will nominate T2 coordinator • Connection between T2D sites and the operations team • Monitoring pages to show sites their performance • LHCb Internal log book for T2D site operations • Dedicated mailing list for T2D sites and candidates • Monthly video/audio conferences for T2 sites

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