1. ALICE Computing Model A pictorial guide

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

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

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