Hey everyone!

I have encountered problems when restoring from LTO Tapes.
Making backups and storing them on the tapes is working absolutely fine. No 
problems here. Writing and reading with tar directly to and from the tapes 
is also working fine.

However when I am starting a restore job, I encounter problems. The 
operation aborts with the error message "Volume data error! Block checksum 
mismatch!".

I just can't get my head around the reason. I have experimented with 
different block sizes (variable and fixed), different compression settings 
(software-compression and hardware-compression), using brand new tapes for 
testing, but the end result is always the above mentioned error.

I realise, that this was a problem with miscalculated CRC-checksums some 
versions prior (Bareos Bug 0001180 
<https://bugs.bareos.org/view.php?id=1180>). However I am using version 
21.1.5 under FreeBSD 13.1 from the official package sources. The tape 
streamer in use is a HP LTO4 Ultrium 1760.

Does anybody have an idea or even had this error before? Any input 
whatsoever is very appreciated.

Thanks in advance. Cheers!

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