Hi
Nope, it is not the expected behavior unless jobs with many I/O disk access like p2p feature (transmission, resilio, ...) are running on your nas.
First check is the fan is really running
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ps auxf|grep fan-d
root 1105 0.0 0.2 1808 1324 ? Ss Jan03 0:07 /usr/sbin/fan-d
root 26844 0.0 0.4 5828 2348 pts/0 S+ 14:14 0:00 | \_ grep fan-d
so you should have a line "/usr/sbin/fan-d"
2d check : read disk temp history on sda sdb,...,sde
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smartctl -l scttemp /dev/sda
(change by sdb ...) and then examine on each disk if on the last 30 days, temp disk always stays high (>60°) information are on the lines
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...
45 2024-01-19 06:45 37 ******************
46 2024-01-19 06:46 ? -
47 2024-01-19 06:47 37 ******************
... ..( 2 skipped). .. ******************
50 2024-01-19 06:50 37 ******************
51 2024-01-19 06:51 38 *******************
... ..( 4 skipped). .. *******************
56 2024-01-19 06:56 38 *******************
57 2024-01-19 06:57 39 ********************
58 2024-01-19 06:58 39 ********************
59 2024-01-19 06:59 39 ********************
60 2024-01-19 07:00 38 *******************
....