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Re: How to make btrfs forget a disk?

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Andrei POPESCU wrote:
> On Du, 14 mar 21, 17:34:40, Victor Sudakov wrote:
> > Andrei POPESCU wrote:
> > > 
> > > I'm guessing it's in the GPT somewhere. Did you try removing the entire 
> > > partition table before switching to ZFS?
> > 
> > There had been no partition table, I just ran "mkfs.btrfs /dev/nvme1n1"
> > on the whole raw volume, and then mounted /dev/nvme1n1.
> > 
> > Later, when switching to ZFS, I ran "zpool create fastdrive /dev/nvme1n1" 
> > again on the whole volume. But ZFS outsmarted me and created a GPT
> > though I had not asked it to.
>  
> Your blkid output suggests the GPT was created by btrfs ;)

Maybe btrfs does create it under some circumstances, but I cannot
reproduce it now:


root@test2-vas:~# blkid /dev/xvdg
root@test2-vas:~# mkfs.btrfs /dev/xvdg
btrfs-progs v4.20.1 
See http://btrfs.wiki.kernel.org for more information.

Detected a SSD, turning off metadata duplication.  Mkfs with -m dup if you want to force metadata duplication.
Label:              (null)
UUID:               7d64c5ab-ae59-4e8d-aa6a-a86d7702f029
Node size:          16384
Sector size:        4096
Filesystem size:    100.00GiB
Block group profiles:
  Data:             single            8.00MiB
  Metadata:         single            8.00MiB
  System:           single            4.00MiB
SSD detected:       yes
Incompat features:  extref, skinny-metadata
Number of devices:  1
Devices:
   ID        SIZE  PATH
    1   100.00GiB  /dev/xvdg

root@test2-vas:~# 
root@test2-vas:~# blkid /dev/xvdg
/dev/xvdg: UUID="7d64c5ab-ae59-4e8d-aa6a-a86d7702f029" UUID_SUB="f0868f63-b40d-413a-ba76-6837b67b8ecf" TYPE="btrfs"
root@test2-vas:~# 
root@test2-vas:~# fdisk !$
fdisk /dev/xvdg

Welcome to fdisk (util-linux 2.33.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

The old btrfs signature will be removed by a write command.

Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x43734e7e.

Command (m for help): 

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

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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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