Information Technology

1
11/12 Sept 2000
LHCb GRID Meeting

2
AGENDA

• 930 LHCb MC Production
• Points
• SICB
• Processing Req.
• Data Storage
• Data Transfer
• Quality Checking
• Bookeeping
• ??
• Discussion
• Points of Action
• 1100 Tea
• 1200 Departure for

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

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)

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.

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)