Re: Partitioning or blkid issue?

[Hank Barta <hbarta@gmail.com>]

Hi Karel,
Thanks for the suggestion. I tried that fix and it didn't seem to
help. I went ahead and wiped the disk partitioning information (using
`wipefs`) and conforming that it was wiped. I reinstalled Windows and
followed with Debian Linux and find the same situation.
I'm not sure where this went wrong.

On Mon, Dec 17, 2018 at 3:14 AM Karel Zak <kzak@redhat.com> wrote:
>
> On Fri, Dec 14, 2018 at 11:53:52AM -0600, Hank Barta wrote:
> > I have an issue where `gparted` seems to display incorrect information
> > on my system drive (and `parted` seems to report correct information.)
> > I filed a bug on Launchpad (since this manifests on Ubuntu 18.10)
> > https://bugs.launchpad.net/ubuntu/+source/gparted/+bug/1808421 and was
> > directed to https://gitlab.gnome.org/GNOME/gparted/issues/14 which
> > does appear to be the same issue. Near the end of the first link is
> > information I collected when running Ubuntu 18.04 (from `blkid` and
> > `wipefs`)
> >
> > I have found that when this system is running Debian Stretch from USB
> > that `gparted` appears to produce the correct output. Below is the
> > same information collected when running Debian Stretch.
> >
> > root@debian:/home/user# apt policy util-linux
> > util-linux:
> >   Installed: 2.29.2-1+deb9u1
> >   Candidate: 2.29.2-1+deb9u1
> >   Version table:
> >  *** 2.29.2-1+deb9u1 500
> >         500 http://deb.debian.org/debian stretch/main amd64 Packages
> >         100 /var/lib/dpkg/status
> > root@debian:/home/user# blkid /dev/sda
> > /dev/sda: LABEL="rpool" UUID="4510611204828545482"
> > UUID_SUB="9816084798696086204" TYPE="zfs_member"
> > PTUUID="eba09d2e-0f70-4d11-8e37-c1c170cfd9dd" PTTYPE="gpt"
> > root@debian:/home/user# wipefs --no-act /dev/sda
> > offset               type
> > ----------------------------------------------------------------
> > 0x200                gpt   [partition table]
> >
> > 0xe8e0d3f000         zfs_member   [filesystem]
> >                      LABEL: rpool
> >                      UUID:  4510611204828545482
> >
> > root@debian:/home/user#
> >
> > I would like to know if this identifies a problem in the partition
> > table or an issue with `blkid`. (Or something else?)
> > I don't think I installed a ZFS pool on the entire disk but I could be
> > wrong about that. It is also possible that one of my operations did
> > cause a problem with the partition table.
>
> It seems like disk originally formatted as ZFS has been later
> partitioned by GPT.
>
> In this case it does not seem like false positive ZFS detection. You
> need ZFS magic string and guid= (aka UUID_SUB), pool_guid= (aka UUID)
> and name= (aka LABEL) variable names and data on the right offsets.
>
> > This is a test system and relatively new install so it would not be a
> > huge problem to 'nuke and repave' if that is necessary to fix this or
> > to try anything that can further identify the problem.
> >
> > Suggestions on what I should do next are most welcome!
>
> The ideal is to use partitioning tools that wipe the disk before it
> writes partition table. Or use "wipefs -a" to cleanup all from the
> disk before you use it (this is recommended step during system
> installation).
>
> For now you can use "wipefs -o 0xe8e0d3f000" to remove only the
> unwanted ZFS stuff.
>
>     Karel
>
> --
>  Karel Zak  <kzak@redhat.com>
>  http://karelzak.blogspot.com



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