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ALICE Computing Model

A comprehensive guide outlining the ALICE Computing Model for P2 data taking, reconstruction phases, MC analysis, and more, providing insights into data flow during various operational phases at CERN.

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ALICE Computing Model

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  1. ALICE Computing Model A pictorial guide

  2. During pp run i (7 months): P2: data taking T0: first reconstruction T1: additional reconstructions & analysis T2: MC & analysis P2 CERN T0 External T2s T2 farm Disk <300 TB> T0/PAF farm HLT farm Export 0.1 Gb/s Import 0.03 Gb/s • 1st reconstruction i: • RAW -> ESD External T1 DAQ farm T1 farm Export 0.1 Gb/s Import 0.3 Gb/s MSS 1.3 PB • Export RAW + ESD : • 0.5 Gb/s • Nth reconstruction i-1: • RAW -> ESD • RAW: • 100 MB/s Disk <200 TB>4 Disk buffer 50 TB • RAW: • 0.8 Gb/s Disk buffer 200 TB • Import RAW + ESD : • <0.2 Gb/s>4 MSS <300 TB>4 Average re-processing <N>=3

  3. During AA run i (1 months): P2: data taking T0: Fast analysis with PAF T1: additional reconstructions & analysis T2: MC & analysis P2 CERN Computing Center External T2s T2 farm Disk <300 TB> MSS 2.3 TB HLT farm Export 0.1 Gb/s Import 0.03 Gb/s Disk buffer 240 TB External T1s • Export RAW : • 0.5 Gb/s DAQ farm T1 farm Export 0.1 Gb/s Import 0.3 Gb/s • Nth reconstruction i-1: • RAW -> ESD • RAW: • 1.25 GB/s PAF Disk <400 TB>4 Disk buffer 50 TB • RAW: • 10 Gb/s Disk • Import RAW + ESD : • <0.2 Gb/s>4 MSS <600 TB>4 Average re-processing <N>=3

  4. During Shutdown (4 months): T0: First AA reconstruction T1: additional reconstructions & analysis T2: MC & analysis CERN T0 External T2s T2 farm Disk <300 TB> T0 farm Export 0.1 Gb/s Import 0.03 Gb/s • 1st reconstruction AA i: • RAW -> ESD External T1 T1 farm Export 0.1 Gb/s Import 0.3 Gb/s MSS 1.3 PB • Export RAW + ESD : • 0.5 Gb/s • Nth reconstruction i-1: • RAW -> ESD Disk <400 TB>4 • Import RAW + ESD : • <0.2 Gb/s>4 MSS <600 TB>4 Average re-processing <N>=3

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