All servers in the main room of 1,450 m2 is the level 0, the first point of contact between the LHC experimental data and the Grid. The 95 000 processor cores and 10 000 servers hosted in its data center run 24/7. A remote extension of the CERN Data Centre is hosted at the Wigner Research Centre for Physics in Hungary. The CERN and Wigner Data Centres are connected via two independent and dedicated 100Gbps circuits, with a bandwidth equivalent to the transfer of 5 full DVDs per second. The LHC experiments produce over 30 petabytes of data per year. These are transferred to the data centre where initial data reconstruction and archival is performed. Over 100 petabytes are kept in mass-storage systems.