Are you perhaps using a robot without a barcode reader or tapes without barcodes?
What happens when you do "Show contents" in the Inventory GUI? Do the tapes show up as ???????
If that is the case, you should not use 'normal' inventory. NBU will assume all tapes in the robot are new. There is another utility that does a 'physical inventory' called vmphyinv.
Extract from Admin Guide I:
For robots without barcode readers or for volumes without readable barcodes, the new media IDs are based on a media ID prefix that you specify. You should consider using the vmphyinv physical inventory utility to add the media. The vmphyinv physical inventory utility inventories nonbarcoded tape libraries as follows:
■ Mounts each tape
■ Reads the tape header
■ Identifies the tape in each slot
■ Updates the NetBackup volume configuration
For more information, see “Using the physical inventory utility” on page 572.
Example:
/usr/openv/volmgr/bin/vmphyinv -rn 0
(More options in the NBU commands manual)
