So I don't know much about Unraid even though I use it as a storage and plex server so I struggle any time a fault arises most times. In this case my server will boot, I log in and the first drive will stay frozen as "mounting" and do nothing else. Multiple resets did nothing to change this, and it does the same thing in Safe Mode. My cache drive, app data, and plex data drives that I had on individual SSD's were blanked out and I was forced to clear them and reformat. This changed nothing. So what I am trying to do is find some way to get my drives to mount and get the array to start.

1644 is the syslog prior to starting the array, 1648 is the syslog after starting the array

fractal-plex-syslog-20250927-1648.zip fractal-plex-syslog-20250927-1644.zip

I have run smart checks on all my drives and no errors were detected.

Edited September 27, 2025Sep 27 by journeyman25

Your going to want to post the full diagnostics.

Zfs on disk1 is panicking on import; try mounting it read-only, reboot the server, and before starting the array type

zpool import -o readonly=on disk1

If that works, start the array, disk1 will show as unmountable, but the data should be accessible under /mnt/disk1. Copy it to another disk/pool and then reformat the disk.

Here is the diagnostic file.

Also, despite looking it up I can't find a means to put my disk 1 in Read Only. What steps do I need to take to make that happen?

fractal-plex-diagnostics-20250928-1754.zip

9 hours ago, journeyman25 said:

What steps do I need to take to make that happen?

You just need to type what I posted above.

Unfortunately it did not work. I was looking at my boot sequence and noticed the line “no zpool”. I think my zpool has been deleted somehow.

zpool status shows nothing.

Post the output you get from that command, and also the output from zpool import

It won’t complete, it stays blank.

Which one? Post a screenshot.

Reboot to clear the logs, don't start the array, try just the zpool important command, and if the same thing happens, post new diags.

No change

fractal-plex-diagnostics-20250930-1720.zip

zfs is panicking with just the zpool import. Try this: reboot again, then type:

echo 0 >/sys/module/zfs/parameters/spa_load_verify_data

echo 0 >/sys/module/zfs/parameters/spa_load_verify_metadata

and try zpool import again.

No change

I'm afraid that the filesystem is too damaged, you will need to reformat the disk to be able to start the array, if there's important data there and no backups, you can try a file recovery app like UFS Explorer; the free trial should show if it can recover anything.