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Groups > linux.debian.user > #232865

Re: How to make btrfs forget a disk?

From Anssi Saari <as@sci.fi>
Newsgroups linux.debian.user
Subject Re: How to make btrfs forget a disk?
Date 2021-03-12 09:20 +0100
Message-ID <BRLbz-63i-1@gated-at.bofh.it> (permalink)
References <BRFSy-2vB-5@gated-at.bofh.it> <BRGvf-33U-1@gated-at.bofh.it> <BRGYi-3eA-3@gated-at.bofh.it> <BRInn-4aN-1@gated-at.bofh.it>
Organization An impatient and LOUD arachnid

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Victor Sudakov <vas@sibptus.ru> writes:

> "wipefs -t btrfs -f -a /dev/nvme1n1" did the job.
>
> Still wondering where those labels are stored on disk in Linux.

Didn't wipefs tell you? I don't have any btrfs but for me wipefs prints
at which offset it found which label. Like this, for a Linux swap
partition:

# wipefs /dev/sdb5
DEVICE OFFSET TYPE UUID                                 LABEL
sdb5   0xff6  swap 8af9fb67-38ca-4c91-bbbd-d53c5ac1f30a 

And if I hexdump a bit of /dev/sdb5 I get:

000ff0 00 00 00 00 00 00 53 57 41 50 53 50 41 43 45 32  >......SWAPSPACE2<
001000 01 00 00 00 8a f9 fb 67 38 ca 4c 91 bb bd d5 3c  >.....ùûg8ÊL.»½Õ<<
001010 5a c1 f3 0a 00 00 15 00 80 00 ff ff ff ff 03 00  >ZÁó.......ÿÿÿÿ..<
001020 00 00 01 00 00 00 00 00 00 00 3d b5 04 00 00 00  >..........=µ....<

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Thread

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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