In breaking changes 23.0.0 release note you will notice some information 
about the blocksize

https://docs.bareos.org/Appendix/ReleaseNotes.html#breaking-changes

;-)
Maybe your drive or scsi adapter in not able to run 1MB
On Sunday 14 July 2024 at 18:13:51 UTC+2 Alexandre Denault wrote:

> Hi,
>
> So it took a quick bit of debugging, but I discovered that Debian had 
> changed my default block size to 512. Issuing
>
> mt -f /dev/nst0 defblksize 0
>
> brought the drive back to variable block size, which fixed the problem.
>
> I can always add in more information if someone is curious.
>
> Cheers,
>
> On Sunday, July 14, 2024 at 12:01:18 AM UTC-4 Alexandre Denault wrote:
>
>> Hi,
>>
>> I've also noticed the following in dmesg:
>>
>> [st0] Incorrect block size.
>>
>> Could it be that Bareos is not reading the correct blocksize for the 
>> header of the tape?
>>
>> Cheers,
>>
>> On Saturday, July 13, 2024 at 9:21:50 PM UTC-4 Alexandre Denault wrote:
>>
>>> Hi,
>>>
>>> For the last few weeks now, I've been unable to mount any of my LTO-5 
>>> drive. I always get the following error
>>>
>>> *stored/block.cc:1004 Read error on fd=6 at file:blk 0:0 on device 
>>> "TapeDrive0" (/dev/nst0). ERR=Input/output error.*
>>>
>>> At first, I suspected the drive was at fault. However, xTalk did not 
>>> detect any problem with the drive itself.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> *Test Summary        Drive Detection Test -------- : Passed        SCSI 
>>> Interconnect Test ------ : Passed        Tape Load Test -------------- : 
>>> Passed        Quick Write/Read Test ------- : Passed        Small Buffer 
>>> Wr/Rd Test ----- : Passed        System Level Test ----------- : Passed    
>>>     Time Test ------------------- : Passed        Multi-Pattern Test 
>>> ---------- : Passed        LTO Error Rate Test  -------- : PassedNo Problem 
>>> DetectedThe tests did not detect any problems.*
>>>
>>> The test suite seems quite complete, including a read of 50Gb of data 
>>> and a validation read.
>>>
>>> I also tried with a different LTO5 drive, but got the same result. 
>>>
>>> I formatted one my tape and re-labeled it. I was able to mount that tape 
>>> perfectly and complete some backups on it with no problems. However, all my 
>>> old backups on tapes remain inaccessible. Right now, it looks like I will 
>>> eventually have to reformat and relabel all my tapes to use them with 
>>> Bareos. I have over 50 tapes with 2 years of backups.
>>>
>>> This problem started around the time I updated to Bareos 23, although I 
>>> can't confirm that this is the problem. I am also unable to test 
>>> downgrading to Bareos 22 as I can't find any package for that.
>>>
>>> My drive is a a Quantum Ultrium 5 SAS (internal) and I use a mix of 
>>> Fujifilm and Quantum LTO 5 tapes. 
>>>
>>> Director:  23.0.4~pre61.010c81fdc (03 July 2024) Debian GNU/Linux 11 
>>> (bullseye)
>>> Storage (tape): 23.0.4~pre74.8cb0a0c26 (10 July 2024) Debian GNU/Linux 
>>> 11 (bullseye) 
>>> Any suggestions to what I should tried to debug this problem? I would 
>>> rather not loose 2 years of backups if I can.
>>>
>>> Thanks,
>>>
>>>
>>>  
>>>
>>

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