I've now seen that the issue also exist into our daily 'File to Tape' Jobs. Our daily File to Tape Jobs has around 2.5TB of data and uses 2 LTO5 tapes!
Here some screenshots that show the issue...
Here you can see, that veeam reprts the 'File to Tape'-Job as succesfull (daily B2T job):
Here you see a screenshot of the media pool with the tapes of the above job. Veeam Shows that both tapes have the same sequence no and tape 353L5 has a free capacity of 1.3TB!
This is impossible! Normaly there have to be sequence no. 1 and 2 and on tape 2 has to be a free space from app. 350GB!
Here an Screenshot of an older B2T from November. Everything runs fine this B2T job.
If the B2T Job runs without issue the media pool shows like this (weekly B2T job):
Here you can see, that there are the sequence no is 1,2 and 3! And also the free space on the tapes shown correct!
All our 'File to Tape' Jobs are full backup jobs. We don't use incremental for 'File to Tape' jobs. Our 2 B2T jobs run automaticly (Tu-Sa -> B2T daily, So -> B2T weekly)