Re: How to make btrfs forget a disk?

From	Andrei POPESCU <andreimpopescu@gmail.com>
Newsgroups	linux.debian.user
Subject	Re: How to make btrfs forget a disk?
Date	2021-03-14 12:20 +0100
Message-ID	<BSwWS-tR-5@gated-at.bofh.it> (permalink)
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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 ;)

> The FreeBSD variety of ZFS does not do that, but Solaris AFAIR does
> like Linux.

In my understanding it does so to reserve 8MiB of space at the end of 
the drive, in case a later replacement for a RAID is slightly smaller.

It also allows to use GPT partition labels on create to get nicer names 
for your physical devices.

Kind regards,
Andrei
-- 
http://wiki.debian.org/FAQsFromDebianUser

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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