6 disk array with 2 parity drives, one of the disks was showing "Metadata corruption detected" in the logs and showing "Unmountable: Unsupported partition layout" on the main array device screen.

 

I stopped the array and unassigned the 4TB disk from disk slot 3 and started the array so it was showing disk 3 as emulated.

While the disk was emulated I formatted the now unassigned disk that was from slot 3.

Stopped the array again and added the now formatted 4TB disk back to slot 3.

I started the array which initiated a data-rebuild, it's done about 854 GB (21.3 %) but I cannot see any of this being written onto disk 3.

 

Have I made a mistake and it's actually just removing the 4TB from parity, and not restoring the data from parity?

Edited May 8, 20242 yr by Tasty

You'd be rebuilding exactly the same corrupted filesystem onto the drive again.

 

Parity can't do anything about filesystem corruption, you have to use check filesystem for that.

That was definitely not the correct procedure for handling an unmountable disk.   The correct procedure is documented here the online documentation accessible via the Manual link at the bottom of the Unraid GUI.  In addition every forum page has a DOCS link at the top and a Documentation link at the bottom. 

 

Was the disk ever showing as disabled' (i.e. had a red 'x') ?  When you say you 'formatted' disk 3 do you mean you did it using something like Unassigned Devices or from the array level.   If the latter you probably formatted the 'emulated' drive, not the physical one, and the rebuild is putting that onto the physical disk.

 

You should post your system's diagnostics zip file in your next post in this thread to get more informed feedback.  It is always a good idea to post this if your question might involve us seeing how you have things set up or to look at recent logs.