Performance and upgrade plans for the CMS detector

The CMS experiment at the CERN Large Hadron Collider has collected data during year 2011 for an integrated luminosity exceeding 5 fb−1 at 7 TeV center of mass energy. The detector performed excellently, with very good data taking efficiency since the very beginning. The operational experience will be described, including the first part of 2012, focusing on some relevant technical aspects. New challenges dictated by the planned luminosity increase are ahead for CMS. A general overview of the upgrade plans to cope with increased luminosity scenarios will be given, including both medium and long term range.