Re: Fi corruption on RAID1, generation doesn't match

[Lionel Bouton <lionel-subscription@bouton.name>]

Hi,

Le 07/02/2016 14:15, Andreas Hild a écrit :
> Dear All,
>
> The file system on a RAID1 Debian server seems corrupted in a major
> way, with 99% of the files not found. This was the result of a
> precarious shutdown after a crash that was preceded by an accidental
> misconfiguration in /etc/fstab; it pointed "/" and "/tmp" to one and
> the same UUID by omitting a subvol entry.
>
> Is there any way to repair or recover a substantial part of this RAID?

I don't think the RAID is damaged: most distributions including Debian
remove nearly all files from /tmp at boot.
If /tmp and / were as you described the same filesystem your server most
probably did what amounts to "rm -rf /". You would probably have got the
same result with any filesystem as mounting the same filesystem at
several points in the VFS is not BTRFS-specific.

Unless you can restore a snapshot or there is a way to debug the
filesystem to restore a previous state, I'm afraid there's nothing to be
done.

Best regards,

Lionel