1. Marco Cattaneo LHCb computing status for LHCC referees meeting 14 th June 2011 1

2. Marco Cattaneo Data taking status  Constant luminosity ~10 pb -1 /day  HLT rate as foreseen 3kHz “physics” 2

3. Marco Cattaneo Tier 1 resource usage and shares 3 2011 Pledges Tier0/1% of total DE15.4% CERN29.3% NL20.9% IT11.2% UK16.9% ES6.3% FR27.6%

4. Marco Cattaneo Tier 1 usage 4 2011 pledge

5. Marco Cattaneo Reprocessing during data taking 5 Reprocessing Live data

6. Marco Cattaneo Reprocessing during data taking  Reminder: end of year reprocessing will take ~3 months, must start before end of run  Have reprocessed all 2011 data taken before May Technical stop Started during TS, continued in parallel to data taking Saturated Tier1’s, built up large queues of waiting jobs  Number of running jobs at several Tier1 is below pledges Reasons under investigation 6

7. Marco Cattaneo Tier 2 usage (simulation) 7 2011 pledge

8. Marco Cattaneo Reprocessing prospects  Commissioning of Tier2 for reprocessing Pilot sites selected Production tests imminent  Use of online farm for reprocessing Being investigated within online project  In both cases, we hope to be able to use some of these resources for 2011 reprocessing Largely dependent on availability of manpower for commissioning, same manpower as for operations 8

9. Marco Cattaneo Memory usage issue  Observation of logarithmic increase in memory usage of jobs Proportional to volume of I/O  Due to way in which LHCb uses ROOT via POOL  Implemented a new persistency directly in ROOT To be deployed before end of year Allows more efficient (longer) stripping jobs 9 POOL ROOT