Operation of the CMS silicon tracker

The CMS silicon tracker is the largest silicon detector ever built. It consists of a hybrid pixel detector with 66 million channels and a 200 m$^2$ silicon strip detector with 10 million readout channels. The presentation describes the operational performance of this detector during data taking years before the current LHC shutdown, during proton-proton collisions. The results here presented include signal-over-noise, hit efficiency and resolutions and effects of radiation on sensor and readout chip.