The tracking performance of the ATLAS detector relies critically on the silicon and gaseous tracking
subsystems that form the ATLAS Inner Detector. Those subsystems have undergone significant
hardware and software upgrades to meet the challenges imposed by the higher collision
energy, pile-up and luminosity that are being delivered by the LHC during Run2. The key status
and performance metrics of the Pixel Detector and the Semi Conductor Tracker, are summarised,
and the operational experience and requirements to ensure optimum data quality and data taking
efficiency are described.