The above errors are SCSI related errors and are presented to NetVault i.e. an issue that is outside of NetVault Backup.
This points to 'END OF DATA DETECTED' being reached and therefore the backup continues and overshoots the tape; therefore loses the channel.
You can change the setting on the drive(s) within NetVault Device Manager to have more space at the end of a tape to be saved, as every tape is never the same length.
The default setting is 2048 and should be sufficient generally.
The Media Block Size (MBS) is set to 64 on the drive “Block size set to 65536”, but the block size on the tape is set to 1024 e.g. “bs = 1024” as per the above log entries.
There is a possibility that the SCSI Card block size may be set to 1024? Is the SCSI card setup to use a block size of 1024? If yes, lower it to 256 (please consult your hardware vendor for the instructions). Additionally make sure that the Windows Operating System where the NetVault Server resides is a 32Bit version for that old SCSI Card that is currently being used.
Or replace the SCSI card with a modern version that can be used to work more reliably with a 64Bit Operating System.
Additionally try and blank the media (if you no longer need the data on that tape), so the MBS 64 from the drive is used?
Note: We highly recommend that you don’t use a MBS or block size of 1024, as this is way too high for a Windows environments.
The maximum should be 256 for a FC connection with Windows, but 64 is a good compromise between backing up small and large files with SCSI attached devices on Windows Operating Systems.