Operation, calibration and performance of the CMS silicon tracker

The CMS tracker is the largest silicon detector ever built. It consists of the inner pixel detector, with 66 million silicon pixels, surrounded by the strip tracker with almost 10 million readout channels and an active area of close to 200$m^{2}$. These detectors, with an operational fraction of over 98\%, have been calibrated and aligned both with cosmic rays and LHC pp collisions at 0.9, 2.4, and 7 TeV centre-of-mass energy. The excellent performance of the CMS tracker with LHC collisions is described, showing the results of precise commissioning, efficient operations and continuous monitoring of the CMS tracker.