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LHCb GRID Meeting

11/12 Sept 2000. LHCb GRID Meeting. AGENDA. 9:30 LHCb MC Production Points SICB Processing Req. Data Storage Data Transfer Quality Checking Bookeeping ?? Discussion Points of Action 11:00 Tea 12:00 Departure for. Action Items Responsibilities.

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LHCb GRID Meeting

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  1. 11/12 Sept 2000 LHCb GRID Meeting

  2. AGENDA • 9:30 LHCb MC Production • Points • SICB • Processing Req. • Data Storage • Data Transfer • Quality Checking • Bookeeping • ?? • Discussion • Points of Action • 11:00 Tea • 12:00 Departure for LHCb-GRID T. Bowcock

  3. Action Items Responsibilities • SICb – Eric, Martin (L), David S. (RAL) • Production • Bbar inclusive 500k events in DST2 fomat without trigger requirements (RAL) • 2M events in mini DST2 format (600kB/evt) after L0/L1 cuts (Liverpool) • Need to generate about 20M events at 210 secs • Reconstruct 2M at 130 secs /event • DST2 : min bias 2M at 100 secs/evt • Min bias reconstruction 2M at 50 secs /evt • Pileup 2M at 50 secs/evt • Total : 20M at 250 secs / event (6 mths on MAP) • Target 500 events/file : merge files if necessary • Total data sample (2M evts) is 1.2 TB LHCb-GRID T. Bowcock

  4. Action Items • Data storage/Transfer • Data rate generated 60kB/sec • Network bandwidth Liverpool – CERN 500 kB/s overnight (50% duty cycle) • Bandwidth Liverpool – RAL to be measured • Data at MAP (disk), copy to RAL , copy RAL to CERN where central bookkeeping is updated • Data sample corresponds to 50 x 20 GB tapes (5kSFr) • Try direct transfer from Liverpool to CERN • Eric (CERN), Martin (liverpool), Dave S (RAL) LHCb-GRID T. Bowcock

  5. Data Quality Checking • SICbCHK now exists (summer student) • Histos available viewable from web • AJ data quality manager responsible • No formal responsibility for data quality checking at Liverpool • RNDM numbers : seeds? Chris to email Eric with DELPHI scheme. LHCb-GRID T. Bowcock

  6. Bookkeeping • For production – use same mechanism for generating scripts for submitting batch jobs. • Event type, size of dataset etc • Send back log files (at least in short term), incl. new log file with bookkeeping information • Update database at CERN on receipt of the data • Database has entry with name of dataset at place where it was generated • Joint development needed (Eric and new postdoc at Liverpool) LHCb-GRID T. Bowcock

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