Which command defines or deletes all drives and their paths for a single library in...

According to the IBM Spectrum Protect documentation1, one command that defines or deletes all drives and their paths for a single library in one step is PERFORM LIBACTION with SANDISCOVERY=ON. This command performs a SAN discovery operation on a SCSI or VTL library and automatically defines or deletes all drives and paths that are associated with the library.

https://www.ibm.com/docs/en/spectrum-protect/8.1.7?topic=commands-define-drive-define-drive-library