Had a power outage, upon logging in, noticed one parity drive was missing. Rebooted again, it appeared, I started the array somehow now both of my parity drives are invalid, and parity rebuild is ongoing.

I figured that this wasn't much of an issue (naively), and checked my drives to discover that Disk 4 is Unmountable: Unsupported or no file system.

I troubleshooted this, and found that I needed to run xfs_repair. Tried to run through the GUI on disk 4, but it was failing with IO errors. Then I tried to run through the command line on sdb1p1, and it repaired the filesystem successfully, but upon rebooting again, the drive still shows up as Unmountable. I then stopped the array, removed the device, started the array, stopped the array, and added the device back, but it will not let me start the array.

Currently it does say that disk4 is emulated, but I'm not sure how that is since my parity is invalid?

How should I proceed?

I figure that my parity is lost, and my data on disk 4 is also lost, but I figured I would ask for help before just accepting defeat. I've included diagnostics from earlier in my troubleshooting process, and my most recent diagnostic from my current state

tower-diagnostics-20250619-2321.zip tower-diagnostics-20250619-2157.zip

Post a screenshot of main.

3 hours ago, dpyo said:

sdb1p1

This is incorrect for an array disk.

Must use the md device or you will invalidate parity. Already invalid I guess.

md4p1 if no encryption.

Screenshot of main attached.

8 hours ago, trurl said:

This is incorrect for an array disk.

Must use the md device or you will invalidate parity. Already invalid I guess.

md4p1 if no encryption.

Correct, I understood that it would invalidate parity, which didn't matter since it was already invalid. I did try doing md4p1 first, as well as through the gui, but both failed.

There are 3 invalid disks, hence why the emulated disk4 cannot be checked, I assume this was disk 4?

If yes, install the UD plugin and see if it mounts with it.

Correct, that is disk 4.

Installed UD plugin, mounts the disk fine, seems to be empty? Wouldn't this typically have my share folders even if no data was stored on this disk?

1 hour ago, dpyo said:

Wouldn't this typically have my share folders even if no data was stored on this disk?

No, shares are only created after some share data is written to that disk, if the disk had no data, it's normal to also not have folders.

You can do a new config and re-add disk4, then resync parity, though it's empty, it's still the more direct way to resolve this.

Great, thanks for the help