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For a few months I've been ignoring errors on the disk sdb (the one where liberty_cryptb is located). Now the situation got worse:

plantroon@liberty:~$ sudo zpool status
  pool: liberty_crypt
 state: ONLINE
status: One or more devices has experienced an unrecoverable error.  An
        attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
        using 'zpool clear' or replace the device with 'zpool replace'.
  scan: scrub repaired 0B in 00:26:56 with 0 errors on Sun Jun 11 00:50:58 2023

        NAME                STATE     READ WRITE CKSUM
        liberty_crypt       ONLINE       0     0     0
          mirror-0          ONLINE       0     0     0
            liberty_crypta  ONLINE       1     2     0
            liberty_cryptb  ONLINE       0    10     0

errors: No known data errors

SMART data for both disks shows no errors whatsoever, even after running tests. The error is most likely related to SATA link going down, which can be attributed to the fact that the disk sdb is in my Thinkpad's ultrabay adapter. I should probably stop messing around with laptop as a server, especially if it can't support 2 disks by default? IDK what the best solution is here, I don't have anywhere to move my stuff to.

in reply to Jakub Filo

Probably fixed by setting link_power_management_policy to max_performance for these disks.

More info in this issue: