Re: Interpreting Output of "btrfs fi show"

[Martin Steigerwald <Martin@lichtvoll.de>]

Am Donnerstag, 26. April 2012 schrieb Bart Noordervliet:
> On Thu, Apr 26, 2012 at 11:06, Thomas Rohwer <trohwer@ennit.de> wrote=
:
> >> As for the two filesystems shown in btrfs fi show... I have no clu=
e
> >> what that is about. Did you maybe make a mistake to create a btrfs
> >> filesystem on the whole disk at first?
> >=20
> > That is possible. But afterwards I certainly repartioned the device
> > and created a btrfs filesystem on /dev/sda1. Maybe this info is onl=
y
> > in the partition table? I understand that I should avoid mounting
> > /dev/sda in this situation.
>=20
> Well I think there is a btrfs superblock still present from the
> full-disk filesystem. Due to the offset of the first partition from
> the start of the disk, this superblock was not overwritten when you
> created the filesystem inside the partition. But they very much
> overlap and the full-disk superblock will probably eventually be
> overwritten by elements from the partition filesystem. How you would
> go about erasing the stale superblock and whether it is safe to do so
> I can't say though.

There is the command wipefs. Whether its safe to use here I do not know=
=2E I=20
wouldn=C2=B4t try without a backup.

--=20
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7
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