The backups were done while the DR was added to NetVault with a block size that is not a multiple of 1024. When a backup completes, the index is written to the Media Database and to the backup device. Restores are possible using the index in the Media Database, but if the Media Database is lost, such as by uninstalling NetVault Backup, the indexes from the backup device cannot be imported because of the block size.
The fix for this problem is planned to be included in NetVault Backup 10.0.5.
After upgrading to NetVault Backup 10.0.5 or installing a patch from support, there will be a new setting in the mediamgr.cfg file or you will need to add the following section.
[Defaults:RAS Index Read Block Size]
The value needs to be set to the block size that was used when the backups were done. If that is not known, please contact support for assistance.