1112 Sept 2000 LHCb GRID Meeting Sept 11
11/12 Sept 2000 LHCb GRID Meeting Sept 11 2000 LHCb-GRID Bowcock T. 1
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 Sept 11 2000 LHCb-GRID Bowcock T. 2
Action Items Responsibilities • • SICb – Eric, Martin (L), David S. (RAL) Production – Bbar inclusive 500 k events in DST 2 fomat without trigger requirements (RAL) – 2 M events in mini DST 2 format (600 k. B/evt) after L 0/L 1 cuts (Liverpool) • Need to generate about 20 M events at 210 secs • Reconstruct 2 M at 130 secs /event • DST 2 : min bias 2 M at 100 secs/evt • Min bias reconstruction 2 M at 50 secs /evt • Pileup 2 M at 50 secs/evt • Total : 20 M at 250 secs / event (6 mths on MAP) • Target 500 events/file : merge files if necessary • Total data sample (2 M evts) is 1. 2 TB Sept 11 2000 LHCb-GRID Bowcock T. 3
Action Items • Data storage/Transfer – Data rate generated 60 k. B/sec – Network bandwidth Liverpool – CERN 500 k. B/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 (5 k. SFr) – Try direct transfer from Liverpool to CERN – Eric (CERN), Martin (liverpool), Dave S (RAL) Sept 11 2000 LHCb-GRID Bowcock T. 4
Data Quality Checking • • SICb. CHK 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. Sept 11 2000 LHCb-GRID Bowcock T. 5
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) Sept 11 2000 LHCb-GRID Bowcock T. 6
- Slides: 6