Under NVBU 10.0.1, it is currently impossible to add a drive when another device already added, hosts a drive with the same name and SCSI ID.
Bug 27792 will be resolved in a future NVBU release.
Any attempt to add a drive that has the same drive name and SCSI address as an already added drive, will fail using NVBU 10.0.1.
Status:
Bug 27792 will be fixed in a future NVBU version.
Workaround:
Please contact Support for help adding the tape drive manually, using a specially designed NetVault utility.