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5 months with LHC data

5 months with LHC data. ATLAS: 1.7 PB raw. CMS: 220 TB of RAW data at 7 TeV 70 TB Cosmics during this period 110 TB Tests and exercises with trigger. . LHCb: 70 TB raw data since June. ALICE: 550 TB. WLCG Usage. Use remains consistently high 1 M jobs/day; 100k CPU-days/day.

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5 months with LHC data

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  1. 5 months with LHC data ATLAS: 1.7 PB raw • CMS: • 220 TB of RAW data at 7 TeV • 70 TB Cosmics during this period • 110 TB Tests and exercises with trigger.  LHCb: 70 TB raw data since June ALICE: 550 TB Ian.Bird@cern.ch

  2. WLCG Usage • Use remains consistently high • 1 M jobs/day; 100k CPU-days/day 1 M jobs/day 100k CPU-days/day LHCb CMS • Large numbers of analysis users • CMS ~500, ATLAS ~1000, LHCb/ALICE ~200 ALICE: ~200 users, 5-10% of Grid resources

  3. Job workloads CMS: 100k jobs per day; Red: analysis LHCb ATLAS: analysis jobs ALICE: 60 sites, ~20K jobs running in parallel

  4. Resource status Ian.Bird@cern.ch

  5. CPU – July • Significant use of Tier 2s for analysis • frequently-expressed concern that too much analysis would be done at CERN is not reflected • Tier 0 capacity underused in general • But this is expected to change as luminosity increases Ian.Bird@cern.ch

  6. Budget Issues at CERN • IT asked to reduce 15M over MTP (2011-15) • Proposal of 12M reduction accepted – this is what was approved by FC last week • Part (8.25MCHF over 5 years) comes from the LCG budgets: • Move to 4-year equipment replacement cycles • Save 2 MCHF in 2011, very little afterwards • Stop CERN contribution to USLHCnet • Save 350 kCHF/year. • NB. No CERN contribution to costs of other Tier 1s • Reduce slope of Tier 0 computing resource increase • Save ~ 1 MCHF/year on average • This is the main mechanism we have to reduce costs. Current assumption was ~30%/year growth. Ian.Bird@cern.ch

  7. Budget implications • Note that the proposals have not been discussed with the experiments, nor with the Committees overseeing LCG (LHCC, RRB/C-RSG, OB, etc...) • Reducing the Tier-0 Computing resources for LHC experiments does not seem wise now the detectors are ramping up • Not even taking into account the lack of experience with Heavy Ions • Slowing down the replacement cycles and reducing the slope of computing resources increase • Delays the need for additional computing infrastructure needed for the Tier-0 (e.g. containers) • Will strictly limit the overall experiment computing growth rate in the Tier-0 • Assumes no additional requests from non-LHC experiments • Detailed planning requires further studies • Extending lifetime of hardware from 3 to 4 years • Does not gain anything if the maintenance is extended • Has negative impact on power budget • Requires additional spares, therefore additional budget • May impact service quality • Implies additional effort to cover for repairs • USLHCNet • May have secondary effects ... Ian.Bird@cern.ch

  8. Schedule Ian.Bird@cern.ch

  9. October RRB • Two points to be addressed: • Scrutiny report of use of resources with experience of data • Plan to have a report with same details from each experiment • Discuss with chair of C-RSG at MB on Sep 7 • What should be said about requirements for 2013 • According to MoU process should have said something already • Very difficult to be precise without details of running conditions, and better analysis of how experience with data correlates with planning (TDR etc). Ian.Bird@cern.ch

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