I may have overlooked that I get any output after the smart tests have been finished?
I will check the log files to get further information.
No output. smartctl -t reports the expected time of completion upon initiating the test, it’s up to you to come back after and read the report from smartctl -a or -x.
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I would like to repeat my question regarding the output message of the command sudo ./disk-burnin.sh -tm 'sda sdb sdc sdd':
0: 1 windows (created Tue Nov 19 09:56:45 2024)
1: 1 windows (created Tue Nov 19 09:56:45 2024)
2: 1 windows (created Tue Nov 19 09:56:45 2024)
3: 1 windows (created Tue Nov 19 09:56:45 2024)
Having used -tm in the command above, I understood that tmux would be active, but there are no separate windows, only the prompt $.
If typing tmux 1s in order to find out more details, I only got the following error message:
error connecting to /tmp/tmux-950/default (No such file or directory)
What am I doing wrong?
You launched the script using sudo, the tmux instances are likely running as root. Try using sudo tmux ls.
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My NAS performed the various tests now successfully. The tests took nearly six days in total for all four 12 TB hard disks. The temperatures ranged between 35 and 37°C during the tests, in idle mode, temperatures range between 27° and 28°C.
I checked the results and found no bad sectors according the description in here: https://github.com/dak180/disk-burnin-and-testing/tree/topic/burnin
So I now assume that the hard disks are OK.
Thanks again to everyone here who has helped me with their advice. 
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