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Dzero MC production on LCG

Dzero MC production on LCG. How to live in two worlds (SAM and LCG). What is SAM?. SAM: Sequential Access by Metadata file store sam stations replica catalog metadata database optimizes file delivery to consumers batch interface. What is SAMGrid?. SAM: Sequential Access by Metadata

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Dzero MC production on LCG

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  1. Dzero MC production on LCG How to live in two worlds (SAM and LCG)

  2. What is SAM? • SAM: Sequential Access by Metadata • file store • sam stations • replica catalog • metadata database • optimizes file delivery to consumers • batch interface Grid meeting Jan 28, 2008

  3. What is SAMGrid? • SAM: Sequential Access by Metadata • JIM: Job Information and Monitoring • Fermigrid • OSG • LCG • … Grid meeting Jan 28, 2008

  4. Until January 2007 resource broker user interface SAM station dorsvlegel.nikhef.nl Grid meeting Jan 28, 2008

  5. What is SAMGrid? • SAM: Sequential Access by Metadata • JIM: Job Information and Monitoring • Fermigrid • OSG • LCG • … Grid meeting Jan 28, 2008

  6. From January 2007 Wuppertal submission site execution site FNAL jim client cluster (Nikhef) SAM station Lyon Grid meeting Jan 28, 2008

  7. JIM client • Submits job to submission site • input.jdl specifies: • request number • cluster Grid meeting Jan 28, 2008

  8. input.jdl lcg_requirement_string = tbn20.nikhef.nl:2119/jobmanager-pbs-qlong job_type = dzero_monte_carlo runjob_requestid = 59873 d0_release_version = p20.08.02 jobfiles_dataset = sg_p20.08.02-v3_d0r07-05-03_cfv01-00-00 minbias_dataset = zerob_p20.08.01_RunIIbMC_REALsample_2 runjob_numevts = 205000 events_per_file = 250 station_name = ccin2p3-grid1 Grid meeting Jan 28, 2008

  9. Submission site • Submits cluster job to execution site • Collects non physical output (logs, …) • Collects monitoring data • Monitoring web pages Grid meeting Jan 28, 2008

  10. Execution site • User interface • Submits individual jobs to cluster (edg-job-submit) • Resource broker Grid meeting Jan 28, 2008

  11. SAM station • Delivers exec files • delivers input files • stores metadata and data in SAM Grid meeting Jan 28, 2008

  12. Output from WN • To SAM database: • metadata of intermediate files and MC output • To SAM store: • reconstructed MC output • To submission site • log files Grid meeting Jan 28, 2008

  13. Pro’s • Always in line with Fermi lab (no home grown scripts) • less labor intensive • better monitoring Grid meeting Jan 28, 2008

  14. Cons • Not scalable • SAM station @ in2p3 • Resource broker @ wuppertal • User interface@ wuppertal • less flexible (no home grown scripts) Grid meeting Jan 28, 2008

  15. Scalability • SAM station @ in2p3 • dCache @ ic.ac.uk • Resource broker @ wuppertal • Moved to dorsvlegel.nikhef.nl • User interface @ wuppertal Grid meeting Jan 28, 2008

  16. dorsvlegel@nikhef.nl • Until January 2007 • UI + SAM station • Until January 2008 • UI + JIM station • Now • UI + JIM station + RB (dzero only) Grid meeting Jan 28, 2008

  17. Monitoring • Go to http://samgrid.fnal.gov:8080 • Click submission sites • Click samgrid.fnal.gov Grid meeting Jan 28, 2008

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