(SOLVED) Unsupported partition layout on btrfs but mounts fine on unassigned devices

[Anthwerp]

I swapped SATA cables on the server and suddenly, one of by btrfs drives became unmountable with the error Unsupported partition layout.

I ran the btrfs disk check and no errors found. I loaded the drive on unassigned devices and all the data is there, it just won't mount when I put it as part of the array.

 

Thoughts?

[Anthwerp]

To add to this, when I check Unassigned Devices, there is no other partition on the drive, it's just the BTRFS one.

[JorgeB]

8 minutes ago, Anthwerp said:

Thoughts?

This usually indicates a corrupt GPT partition, please post output of:

 

fdisk -l /dev/sdX

 

[Anthwerp]

The backup GPT table is not on the end of the device.
Disk /dev/sdg: 14.55 TiB, 16000900661248 bytes, 31251759104 sectors
Disk model: ST16000NM001G-2K
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: AE80D6C0-2559-45A3-B9DC-EA4409FE1E4E

Device     Start         End     Sectors  Size Type
/dev/sdg1     64 31249999838 31249999775 14.6T Linux filesystem

[JorgeB]

gdisk should be able to fix that, see here:

https://forums.unraid.net/topic/112243-solved-mount-error-unsupported-partition-layout/?do=findComment&comment=1023895

 

This should be fairly safe but always good to make sure backups are up to date before trying it, or clone the disk with dd first.

[Anthwerp]

I tried with gdisk and w command but it's still unmountable. I'm just going to disable parity, mount it in unassigned devices, and copy the contents into the array via krusader, then wipe. it should preserve the data.