Hi,

one of my 3 Cache disks has gone bad and after removing it with help from the FAQ the Pool shows as "Unmountable: No file system".
I already tried all the instructions from the FAQ except for BTRFS check --repair.

This is the result for trying to mount the file system read only:

mount: /cachebackup: wrong fs type, bad option, bad superblock on /dev/mapper/sdc1, missing codepage or helper program, or other error.

This is the output for btrfs restore:

No valid Btrfs found on /dev/sdb1
Could not open root, trying backup super
No valid Btrfs found on /dev/sdb1
Could not open root, trying backup super
No valid Btrfs found on /dev/sdb1
Could not open root, trying backup super

Looks like a bad superblock? Is there anything I could to to save the data? My Backup appdata folder is empty, never really looked into it after setting it up.

Thanks in advance!

 

umbalungas-diagnostics-20200103-1536.zip

Edited January 3, 20206 yr by CptMyName
Pressed enter by mistake :D

10 minutes ago, CptMyName said:

Looks like a bad superblock?

Possibly, did you try one of the other devices? Or were you running the pool without redundancy?

Note that if the pool was created on v6.7.x it wasn't redundant, because of this bug.

Thanks for the quick reply!

10 minutes ago, johnnie.black said:

Note that if the pool was created on v6.7.x it wasn't redundant, because of this bug.

That was the case. Didn't see the post. Is there a way to restore the data from the 2 healthy disks, or is all lost now?

 

17 minutes ago, johnnie.black said:

Possibly, did you try one of the other devices? Or were you running the pool without redundancy?

I tried the commands with both of the healthy disks, if i assign the dead disk the pool is mountable but none of my shares show up in the webui or smb (not even the "array only" shares).

14 minutes ago, CptMyName said:

or is all lost now?

Most likely all lost since metadata will be missing.