ZFS

root[filer02]:~$ zpool status dozer
  pool: dozer
 state: DEGRADED
status: One or more devices could not be used because the label is missing or
        invalid.  Sufficient replicas exist for the pool to continue
        functioning in a degraded state.
action: Replace the device using 'zpool replace'.
   see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-4J
  scan: resilvered 1.08T in 04:03:12 with 0 errors on Wed Dec 10 02:40:33 2025
config:

        NAME                     STATE     READ WRITE CKSUM
        dozer                    DEGRADED     0     0     0
          mirror-0               ONLINE       0     0     0
            ada1                 ONLINE       0     0     0
            ada0                 ONLINE       0     0     0
          mirror-1               DEGRADED     0     0     0
            6405966840634580760  UNAVAIL      0     0     0  was /dev/ada3
            ada2                 ONLINE       0     0     0
        logs
          nda0p3                 ONLINE       0     0     0
        cache
          nda0p4                 ONLINE       0     0     0

errors: No known data errors
root[filer02]:~$ zpool replace dozer ada3

root[filer02]:~$ zpool status -v
  pool: dozer
 state: DEGRADED
status: One or more devices is currently being resilvered.  The pool will
        continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
  scan: resilver in progress since Tue Dec  9 22:17:51 2025
        37.9G / 7.54T scanned, 2.93G / 7.52T issued at 16.6M/s
        0B resilvered, 0.04% done, no estimated completion time
config:

        NAME                     STATE     READ WRITE CKSUM
        dozer                    DEGRADED     0     0     0
          mirror-0               ONLINE       0     0     0
            ada1                 ONLINE       0     0     0
            ada0                 ONLINE       0     0     0
          mirror-1               DEGRADED     0     0     0
            ada3                 ONLINE       0     0     0
            9460468094011599334  UNAVAIL      0     0     0  was /dev/ada2
        logs
          nda0p3                 ONLINE       0     0     0
        cache
          nda0p4                 ONLINE       0     0     0

errors: No known data errors

pool: dozer
state: DEGRADED
status: One or more devices is currently being resilvered.  The pool will
continue to function, possibly in a degraded state.    
action: Wait for the resilver to complete.
  scan: resilver in progress since Tue Dec  9 22:37:21 2025    
6.69T / 7.54T scanned at 2.26G/s, 122G / 1.56T issued at 41.0M/s
122G resilvered, 7.62% done, 10:13:29 to go            
config:

        NAME                       STATE     READ WRITE CKSUM
        dozer                      DEGRADED     0     0     0  
          mirror-0                 ONLINE       0     0     0  
            ada1                   ONLINE       0     0     0  
            ada0                   ONLINE       0     0     0  
          mirror-1                 DEGRADED     0     0     0  
            ada3                   ONLINE       0     0     0  
            replacing-1            DEGRADED     0     0     0  
              9460468094011599334  UNAVAIL      0     0     0  
was /dev/ada2/old                                              
              ada2                 ONLINE       0     0     0  
(resilvering)                                          


root[filer02]:~$ zpool status |head -n 25
  pool: dozer
 state: ONLINE
status: Some supported and requested features are not enabled on the pool.                                                    
        The pool can still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does not support
        the features. See zpool-features(7) for details.
  scan: resilvered 1.08T in 04:03:12 with 0 errors on Wed Dec 10 02:40:33 2025