I have a zfs raidz1 pool with 3x6TB drives. I shut the server down. I removed one drive that had bad sectors. Right before I clicked Start Array, I got to the three boxes in the UI that showed two drives and an empty space, and I added the new drive there. I clicked Start Array. After the array started, I saw a message that the array was in a degraded state and it started rebuilding. After the rebuilding was completed, instead of working normally, it showed the message:

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.



I tried to run the following commands:

root@Olympus:~# zpool status -v nerv

pool: nerv

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 1.21T in 02:05:50 with 0 errors on Wed Jul 8 15:57:37 2026

config:

NAME STATE READ WRITE CKSUM

nerv DEGRADED 0 0 0

raidz1-0 DEGRADED 0 0 0

22961051357565640 FAULTED 0 0 0 was /dev/sdd1

sdd1 ONLINE 0 0 0

sdf ONLINE 0 0 0

errors: No known data errors

root@Olympus:~# zpool detach nerv 22961051357565640

cannot detach 22961051357565640: only applicable to mirror and replacing vdevs





For more information, look at the images and the diagnostics.


What caused this problem? And how can I fix it without losing my data? Everything else seems to be working normally.

The same thing happened the last time I tried to replace a drive. Back then, I thought it could be a weird software glitch, so I restarted the server. When I tried to start the pools, I got an error that said "nerv is in an invalid pool configuration". I tried to delete that pool and make it again, but every time I added the three drives, the same error appeared. That time I had a spare drive to dump all my data and format, but now I don't have this luxury.

olympus-diagnostics-20260708-1646.zip

There's a known bug with 7.3.0 and zfs replacements, upgrade to 7.3.1 and try again.

You may need to reimport the pool degraded first; I can post the steps if needed.

Just now, JorgeB said:

There's a known bug with 7.3.0 and zfs replacements, upgrade to 7.3.1 and try again.

You may need to reimport the pool degraded first; I can post the steps if needed.

I would really appreciate it if you could post the steps, please.

Fist updatye to 7.3.1, then

on main click on the first device for that pool and then "remove pool"

back on main, create a new pool with the same name and 2 slots

assign the pool device good pool devices from zfs status (look at the device IDs, sdd and sdf, no the previous assignments, and if you rebooted, these ids can change), leave the filesystem set to auto

start the array to import the pool, it should be imported degraded

If yes, you can then stop the array and assign the new device.

3 hours ago, JorgeB said:

Fist updatye to 7.3.1, then

on main click on the first device for that pool and then "remove pool"

back on main, create a new pool with the same name and 2 slots

assign the pool device good pool devices from zfs status (look at the device IDs, sdd and sdf, no the previous assignments, and if you rebooted, these ids can change), leave the filesystem set to auto

start the array to import the pool, it should be imported degraded

If yes, you can then stop the array and assign the new device.

Thank you so much, it worked.