RAW reprocessing and MC RAW reprocessing and MC over the Christmas break over the Christmas break

ALICE TFALICE TFDecember 17, 2009December 17, 2009

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Re-processing (and processing) statusRe-processing (and processing) status

7 Aug1 Dec

~130TB

Cosmics, 85% reprocessedNo further processing requested

Collisions,10TB

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Collision dataCollision 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

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Collision data (2)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)

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Reprocessing of RAWReprocessing 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

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OCDBOCDB• 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

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MC productionMC 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

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Grid updatesGrid 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