Performance of the CMS Silicon Tracker at LHC

After nearly two years of operation at the Large Hadron Collider with proton-proton collisions at a center of mass energy of $7\,\mathrm{TeV}$, the performance of the CMS silicon tracker is reviewed. Both the status and basic properties of the pixel and the strip detector, as well as the performance of the tracking such as vertex reconstruction and b-tagging are discussed.