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Re: How to make btrfs forget a disk?

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Victor Sudakov wrote:
> > On Fri, 12 Mar 2021 at 13:39, Victor Sudakov <vas@sibptus.ru> wrote:
> > 
> > > btrfs thinks that /dev/nvme1n1 has a btrfs:
> > 
> > > # btrfs filesystem show
> > > Label: none  uuid: 3414ae53-f3d4-43ea-bb88-ffefc9bc86f6
> > >         Total devices 1 FS bytes used 1.05TiB
> > >         devid    1 size 2.00TiB used 1.33TiB path /dev/nvme0n1
> > >
> > > Label: none  uuid: 38f74bc8-465d-4866-8ec1-3a144741012c
> > >         Total devices 1 FS bytes used 831.16GiB
> > >         devid    1 size 3.00TiB used 1.48TiB path /dev/nvme1n1
> > >
> > > The problem is that /dev/nvme1n1 is being used for ZFS now, and there is
> > > currently no btrfs thereon. However, there is a btrfs label or something
> > > stuck somewhere, how can I clear it?
> > 
> > Hi,
> > 
> > I do not know the answer because I have never done that,
> > but try reading
> >   man 8 btrfs-device
> > 
> > and then perhaps
> >   btrfs device remove ...
> > 
> 
> "Remove device(s) from a filesystem identified by <path>"
> 
> Hmm. /dev/nvme1n1 is not identified by any path because it's not mounted
> as a btrfs filesystem.

"wipefs -t btrfs -f -a /dev/nvme1n1" did the job.

Still wondering where those labels are stored on disk in Linux.

In FreeBSD, GEOM(4) usually keeps such stuff in the last sector of a
volume/device.

-- 
Victor Sudakov VAS4-RIPE
http://vas.tomsk.ru/
2:5005/49@fidonet

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How to make btrfs forget a disk? Victor Sudakov <vas@sibptus.ru> - 2021-03-12 03:40 +0100
  Re: How to make btrfs forget a disk? David <bouncingcats@gmail.com> - 2021-03-12 04:20 +0100
    Re: How to make btrfs forget a disk? Victor Sudakov <vas@sibptus.ru> - 2021-03-12 04:50 +0100
      Re: How to make btrfs forget a disk? Victor Sudakov <vas@sibptus.ru> - 2021-03-12 06:20 +0100
        Re: How to make btrfs forget a disk? deloptes <deloptes@gmail.com> - 2021-03-12 08:00 +0100
          Re: How to make btrfs forget a disk? Victor Sudakov <vas@sibptus.ru> - 2021-03-12 10:20 +0100
            Re: How to make btrfs forget a disk? David <bouncingcats@gmail.com> - 2021-03-12 10:40 +0100
              Re: How to make btrfs forget a disk? Victor Sudakov <vas@sibptus.ru> - 2021-03-12 11:00 +0100
            Re: How to make btrfs forget a disk? deloptes <deloptes@gmail.com> - 2021-03-12 12:10 +0100
        Re: How to make btrfs forget a disk? Anssi Saari <as@sci.fi> - 2021-03-12 09:20 +0100
          Re: How to make btrfs forget a disk? Victor Sudakov <vas@sibptus.ru> - 2021-03-12 10:30 +0100
      Re: How to make btrfs forget a disk? David <bouncingcats@gmail.com> - 2021-03-12 10:30 +0100
        Re: How to make btrfs forget a disk? Victor Sudakov <vas@sibptus.ru> - 2021-03-12 11:10 +0100
  Re: How to make btrfs forget a disk? Andrei POPESCU <andreimpopescu@gmail.com> - 2021-03-12 17:10 +0100
    Re: How to make btrfs forget a disk? Victor Sudakov <vas@sibptus.ru> - 2021-03-14 05:00 +0100
      Re: How to make btrfs forget a disk? Andrei POPESCU <andreimpopescu@gmail.com> - 2021-03-14 10:50 +0100
        Re: How to make btrfs forget a disk? Victor Sudakov <vas@sibptus.ru> - 2021-03-14 11:40 +0100
          Re: How to make btrfs forget a disk? Andrei POPESCU <andreimpopescu@gmail.com> - 2021-03-14 12:20 +0100
            Re: How to make btrfs forget a disk? Victor Sudakov <vas@sibptus.ru> - 2021-03-15 04:50 +0100
  Re: How to make btrfs forget a disk? Victor Sudakov <vas@sibptus.ru> - 2021-03-16 03:20 +0100

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