ZFS Mirror Degraded - Which drive is it?

[jgiddens]

Hi all,

I got a pool degraded message and saw this as the result of 'zpool status':

  pool: tank
 state: DEGRADED
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'.
   see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-9P
  scan: resilvered 1.71G in 00:00:32 with 0 errors on Wed Sep 22 07:17:10 2021
config:

        NAME                        STATE     READ WRITE CKSUM
        tank                        DEGRADED     0     0     0
          mirror-0                  DEGRADED     0   165     0
            wwn-0x5000c500845d2407  DEGRADED     0   175     6  too many errors
            wwn-0x5000c500845d26fb  DEGRADED     0   175     0  too many errors
          mirror-1                  ONLINE       0     0     0
            wwn-0x50014ee213d579d9  ONLINE       0     0     0
            wwn-0x50014ee2be80b462  ONLINE       0     0     0
          mirror-2                  ONLINE       0     0     0
            sdi                     ONLINE       0     0     0
            sdj                     ONLINE       0     0     0

errors: No known data errors

I did a 'zpool clear' and the pool resilvered and was clean for a few days. Now I see the same error again. The problem I have is I don't know which of those 2 drives is the bad one. How can I find out which physical device is failing?

Thanks.

 

[ryba84]

ls -l /dev/disk/by-id

 

[fabian]

it shows both of them as broken.. maybe check the cables/controller (and in addition maybe your RAM )?