Hi!

I just upgraded from Unraid 6.12.14 -> 7.1.4 and i'm having issues with my zfs pools saying my Disk 1 is "Unmountable: no file system".

I followed Spaceinvader One's video https://www.youtube.com/watch?v=T83gqqh0D4E and have my cache and array disk 1 formatted as zfs.

In hindsight i should never have switched to zfs since i haven't really used it and want my server to be as easy to upgrade and maintain as possible and this is a bit to hard for me. But i really would like to get my server up and running again.

I tried fixing it myself but didn't manage to get it working. I did manage to mount the drive (i think) using zpool import -d /dev disk1. The drive is supposed to be ONLINE again but it still shows as unmountable. If i restart the server the drive is gone again. I did a zpool upgrade so i don't think its possible to roll back to Unraid 6 again.

Before the upgrade

After the upgrade

After my best effort to fix it

root@Bubbatron:~# zpool status
  pool: cache
 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: scrub repaired 0B in 00:00:18 with 0 errors on Wed Jan  1 12:15:41 2025
config:

        NAME         STATE     READ WRITE CKSUM
        cache        ONLINE       0     0     0
          nvme0n1p1  ONLINE       0     0     0

errors: No known data errors

  pool: disk1
 state: ONLINE
config:

        NAME        STATE     READ WRITE CKSUM
        disk1       ONLINE       0     0     0
          md1p1     ONLINE       0     0     0

errors: No known data errors

Any help would be greatly appreciated 🙏

Thanks!

Reboot and post the diagsnostics after array start.

Here are the diagnostics, thank you!

bubbatron-diagnostics-20250711-2239.zip

With the array started, post the ouput from

wipefs /dev/md1p1

Despite the name, this won't wipe anything as written

~# wipefs /dev/md1p1

DEVICE OFFSET        TYPE       UUID                                 LABEL

md1p1  0x0           xfs        265a25f8-0ca7-4a9d-baad-5aa8ac4c42ad 

md1p1  0x4000        zfs_member 12900186009733923430                 disk1

md1p1  0x44000       zfs_member 12900186009733923430                 disk1

md1p1  0x3a381744000 zfs_member 12900186009733923430                 disk1

md1p1  0x3a381784000 zfs_member 12900186009733923430                 disk1

Disk has dual signatures, that is the issue, if you are sure you were using zfs, not xfs, and that checks out since the zfs filesystem can be imported manually, you can delete the xfs signature:

wipefs -a -t xfs /dev/md1p1

Then restart the array, and it should now mount.

P.S. if the pool is imported, you must export it manually before with zpool export disk1

Thank you sooooo much!! Everything is working perfectly again. ❤️