Grid Tier-Modell

The LHC data are stored at worldwide distributed computer centres, which are connected  together with a hierarchic structure with different levels so called "Tiers":

  • Tier-0: CERN as main centre
  • 11 Tier-1 centres + Tier-1 CERN
  • ~160 Tier-2 centres at universities and research centres
  • a lot of instituts clusters and desktop PC as Tier-3 or Tier-4