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ALICE Experiment 2012 Data Summary: Analysis, Storage, and Performance Highlights

This document summarizes the ALICE experiment's data activities for 2012, focusing on the collection and management of significant datasets totaling 1.3PB of RAW data. Key highlights include data collection from p+p collisions at 8TeV and p-Pb pilot runs at 5.02TeV, with extensive contributions from 74 sites. The majority of RAW data has been calibrated and reconstructed, with advancements in analysis tools and support for end-user data access. Site performance remains robust, demonstrating significant CPU efficiency and network quality enhancements throughout the year.

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ALICE Experiment 2012 Data Summary: Analysis, Storage, and Performance Highlights

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  1. ALICE summary 2012Offline LHCC 4/12/2012

  2. Data taking 1.3PB of RAW data 2 replicas: 1 copy @T0, distributed copy @T1

  3. RAW activities • p+p @8TeV • Data sample with enhanced high multiplicity and calorimeter triggers • Pilot run p-Pb @5.02TeV in preparation for p-A period in February 2013 • 5Mio events cycles

  4. 2012 – site contribution 74 sites, ~240Mio CPU hours, ~50% T2 contribution

  5. Productions • RAW data in 2012 • 90% calibrated (new offline calibration schema) • 65% reconstructed • Expected complete reconstruction by mid-Janyary 2013 • p-A sample fully reconstructed (several passes) and analyzed • MC in 2012 • Several large samples for 2011 Pb-Pb data • In total 101 different production cycles ~20% of the RAW data events

  6. Workload 50% MC 15% RAW 10% Trains 25% End user Organized activities, including analysis trains End-user

  7. Data access in analysis • Average 8.6 GB/s, total read 212PB

  8. Interactive analysis support • 3 common PROOF-enabled analysis facilities • CAF (CERN) – 300 cores, 160TB • KIAF (KISTI, Korea) – 350 cores, 200TB • SKAF (Kosice, Slovakia) – 30 cores, 50TB • 3 local PROOF-enabled analysis facilities • LAF (CCIN2P3, Lyon), SAF (Subatech, Nantes), JRAF (JINR, Dubna) • Used for interactive analysis of limited data sets, tuning of cuts and analysis algorithms, fast RAW data reconstruction, calibration

  9. CPU efficiency • Gradual improvement – due to increase of trains share over end-user analysis, analysis tools quality, data buffering November – average 86% September – average 62% November – average 86% October – average 72% October – average 71%

  10. Storage status • Several data cleanup cycles in 2012 • Reduction of replicas for old and rarely accessed data, move to tape if feasible • Reduce ESD replicas overall – move to AODs for all types of analysis • Disk and tapes storage is sufficient for reconstruction, MC and analysis of 2012 data, including p-A sample • Further cleanup and new strategies will be exploited during LS1

  11. Site performances • In general – mature and stable site fabric and support • Very good performance of T0/T1/T2, both storage (tapes/disk) and CPU • Network provision is excellent, LHCone is further diluting the ‘Tier’ boundaries • New in ALICE – soon a T1 in Korea (KISTI), good progress toward T1 in Mexico (UNAM)

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