Score:0

Server

Copied data to LVM-Thin pool by mistake

Hidd

2/26/24, 6:58 PM

I'm here today because of a big mistake that I have made.

I created an LVM-Thin data pool (and not on a LVM-Thin LV) on my Proxmox server and (don't ask why) ran a mkfs.ext4 on the pool then mounted it on my local node. After that I copied a bunch of data on it and stopped my system:

mkfs.ext4 /dev/mapper/pve-data
mount /dev/mapper/pve-data /mnt/data/
cp -r Temp/ /mnt/data/

The next time I created a VM on this pool from the Proxmox GUI, and you guessed it, found out what I had done too late.

I tried to mount the pool again (even if that shouldn't be possible) without any success as you can guess:

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

Tried mount -t ext4 /dev/mapper/pve-data /mnt/data too.

I searched if I could restore the FS on it with a fsck or something but didn't do it by fear of making my data inaccesible forever.

Finally I tried to use PhotoRec on my disks, but because of the time it takes to run I stopped it.

I wanted to know if there was something else to do (with fsck for exemple) before letting PhotoRec run for days on my disks?

Could you help me?

272

1 + 4

filesystems

lvm

mount

data-recovery

shodanshok

2/26/24, 7:12 PM

Please provide the exact commands you run on the system.

Hidd

2/26/24, 7:20 PM

@shodanshok I updated my post with the commands.

Nikita Kipriyanov

2/27/24, 8:47 AM

How it is ever possible to access the volume for creating file system and mounting after it was converted to the thin pool data LV?

Hidd

2/27/24, 9:50 AM

Don’t know myself why it was allowed by the system. It was a case of figure not taken into account.

Score:1

Server

shodanshok

2/27/24, 8:24 AM

You trashed your data-containing volume, so you are not going to see its data again. You must restore from backup.

+ 1

Hidd

2/27/24, 9:51 AM

I think so too. I will have to try working with PhotoRec. If I find something I will write it here. If not I will mark your answer as the correct one. Thanks.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Copied data to LVM-Thin pool by mistake

Post an answer

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