Automated tape library
An automated tape library (ATL) allows you to use system-managed storage for mountable tape cartridges. Mount requests for these cartridges are handled by a robotic tape cartridge handler. An ATL provides management facilities for tape volumes, but does not manage the data sets contained on those tape volumes.
Related reading
For more information about the automated tape library, see z/OS DFSMShsm Implementation and Customization Guide.