Ira,
You can check the HCL (Hardware Compatibility List) for NBU to see if it's happy to use your library:
http://support.veritas.com/docs/280666
Veritas NetBackup (tm) Enterprise Server and NetBackup Server 5.x Hardware Compatibility List (HCL) - includes information for supported drives, libraries, virtual tape devices, robot-types, fibre-channel HBAs, switches, routers/bridges, iSCSI configurations, and encryption devices.
I'll see if I can find the list for 6.0 ...
Try this tech note:
http://support.veritas.com/docs/240456
DOCUMENTATION: A quick reference on how to determine if Veritas NetBackup (tm) supports a specific tape library or device.
Yup, listed below:
http://support.veritas.com/docs/278692
Veritas NetBackup (tm) Enterprise Server and NetBackup Server 6.0 Hardware Compatibility List (HCL) - includes information for supported drives, libraries, virtual tape devices, robot-types, fibre-channel HBAs, switches, routers/bridges, iSCSI configurations, and encryption devices.