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ALICE TF Reprocessing and MC Updates Overview

An update on RAW reprocessing and MC production status, including collision data, updates, and planned activities over the Christmas break in 2009. Information on processing passes, data replication, flexibility, and upcoming tasks.

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ALICE TF Reprocessing and MC Updates Overview

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  1. RAW reprocessing and MC over the Christmas break ALICE TF December 17, 2009

  2. Re-processing (and processing) status 1 Dec 7 Aug Collisions, 10TB Cosmics, 85% reprocessed No further processing requested ~130TB

  3. Collision data • Runs 104321 onward – (single) AliRoot v4-17-Rev-20 revision • Pass 1 with ‘floating OCDB – more on that later • ‘Good runs’ – this is rather immaterial – all runs are marked as ‘good’ • No backlog, but two detectors (HMPID, EMCAL) and one system (HLT) excluded

  4. Collision data (2) • Look only at ‘many detectors’ runs • 365GB RAW, 215 GB output from reconstruction (x4 replica = 860 GB) • All RecPoint written out • Very good reconstruction efficiency • The ESDs are ready few hours after data taking (all automatic process)

  5. Reprocessing of RAW • ~40 physics runs to be replicated to T1s • Exclusively 2 replicas (2x 365GB) • Pass 2 processing will be done exclusively at T1s (as per computing model) • Same level of replicas for ESDs and other objects • Approximately 1 day to reprocess everything

  6. OCDB • Very flexible update policy – all requested retrofits are done on the spot • Quick turnaround, but unstable situation • Essentially every detector has requested a manual update of 1 or more objects • This is a ‘shuttle by hand’, which cannot continue for very long • Clearly some of the detector online calibration strategies need substantial updates

  7. MC production • Mostly ‘First physics’ • 11 cycles, 100-200K events each • Fast turnaround – requested in the evening, ready by morning • Reflecting the running conditions • Few larger cycles are in preparation • Muon Coctail (LHC09a18) 100 Mio events still to be completed • Will run over Christmas, if nothing else is requested by Physics Coordination

  8. Grid updates • SL5 migration • Essentially ready (after a long and painful push) • Many thanks to Patricia and the sites • From January, SL4 will no longer be suppported • CREAM CE • Not yet there, the uptake is difficult at best • Not a showstopper, however it will increase stability and must be installed

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