Array disk in error state -> rebuild -> disk unmountable

[oddj0b]

Hi,

 

I received an error message a couple of days ago that one of my Array disks was in an error state.

 

There are no SMART errors on the disk so I proceeded to do a rebuild (removed disk from Array, added it back and allowed it to rebuild, as per this guide: https://docs.unraid.net/unraid-os/manual/storage-management/#rebuilding-a-drive-onto-itself)

 

The rebuild has just finished, but now the disk is showing 'unmountable: Unsupported or no file system':

 

 

I am not too sure on how to proceed now and I wouldn't to request your support. The guide I am looking at (https://docs.unraid.net/unraid-os/manual/storage-management/#drive-shows-as-unmountable) suggests I should not do an xfs_repair on the disk as this will invalidate the parity, but other posts in the support forum suggest this is what I need to do.

 

How should I repair the disk?

 

Much appreciated!

 

Thanks in advance.

 

diagnostics-20230928-1228.zip

Edited September 28, 2023 by oddj0b

[itimpi]

That guide advises you to do the repair from the GUI which maintains parity and is the least error prone way to do it.   It also tells you how to do it from the command line and maintain parity if you must go that way.

[JorgeB]

Check filesystem on disk4, run it without -n

[oddj0b]

5 minutes ago, JorgeB said:

Check filesystem on disk4, run it without -n

 

Thanks. From the GUI or should I run xfs_repair -v /dev/md4p1?

 

[JorgeB]

3 minutes ago, oddj0b said:

From the GUI or should I run xfs_repair -v /dev/md4p1?

It's the same.

[oddj0b]

thanks. I'll run it and provide an update once done.

[oddj0b]

Hi again

 

The xfs_repair finished running, took about 24 hours. Below is a screenshot of the output:

 

 

I tried starting the Array but I still receive the same 'unmountable: Unsupported or no file system' error message. Is there anything else I could try?

 

Many thanks!

[JorgeB]

Looks like the fs is not recoverable, if I understood correctly you've rebuilt on top of the original disk? If yes best bet is using a file recovery util, like UFS explorer, there's a free trial you can use to see if it can find the data.

[oddj0b]

Thanks. Was I not supposed to rebuild on top of the original disk then?

 

So if understand, I now need to:

 

1: Grab a new drive and format as xfs (same filesystem as my array)

2: Use a recovery tool to and copy as many files as possible to the new drive

 

How do I then add this drive back into the array while avoiding a rebuild? Could you please explain this process to avoid any further issues down the line?

 

Best,

G

[JorgeB]

21 minutes ago, oddj0b said:

Was I not supposed to rebuild on top of the original disk then?

You should never do that before confirming the emulated disk is mounting and contents look correct, whatever you see on the emulated disk is the same you will see after the rebuild is done, so if it's unmountable see if it's fixable before rebuilding.

 

22 minutes ago, oddj0b said:

How do I then add this drive back into the array while avoiding a rebuild?

If you have some space elsewhere you can remove that disk from the array and copy the data, then put it back, format and restore the data, if you prefer to replace the disk you can either just replace it with another one and rebuild (then format), or do a new config with the new disk and resync parity.