CMS Drift Tubes system during LHC 2010 operation

The DT (Drift Tube) chambers of the CMS (Compact Muon Solenoid) experiment are responsible for muon identification and precise momentum measurement. After several years of installation and commissioning, the DT system has finally been operated under proton-proton and heavy ions collisions in the LHC (Large Hadron Collider) at CERN during the 2010 campaign. Operation of the detector and its electronics during this period has been outstanding. More than 99~\% of the system has been fully operational and the downtime has been below 0.1~\% throughout the whole year. The operation of the trigger and data acquisition systems during this period has been remarkable. The main results summarizing the performance of the DT detector and its electronics with 2010 collision data are presented. Details about chamber and local trigger efficiency, calibration and synchronization are described, showing how well the challenging design goals have been met.