Re: Help needed: error booting to btrfs filesystem

[Michael Evans]

On Fri, Apr 23, 2010 at 11:16 AM, Eugen Dedu
<address@hidden> wrote:
> Hi,
>
> I have a new computer with SSD disk.  I installed today debian sid with
> debian-installer (daily image from 22 March, the latest available now,
> http://cdimage.debian.org/cdimage/daily-builds/daily/arch-latest/amd64/iso-cd/),
> which uses I think grub v. 1.98.  I have only one partition.  I prefer
> to use btrfs for it.
>
> So (according to http://www.howtoforge.com/boot-on-btrfs-with-debian and
> another page), after successful debian installation with ext3, I booted
> on debian-installer CD and:
> - I downloaded btrfs-convert and the other btrfs utilities
> - I replaced UUID=... with /dev/sda1 in /boot/grub/grub.cfg and /etc/fstab
> - and converted ext3 to btrfs according to the page above.
>
> Now, when I boot, I receive:
> GRUB loading.
> Welcome to grub!
>
> error: unknown filesystem.
> Entering rescue mode...
> grub rescue>
>
> What can I do to boot into btrfs?  Cannot grub boot into btrfs?  I
> looked for information on Internet with no luck...
>
> --
> Eugen Dedu
>
>
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> http://lists.gnu.org/mailman/listinfo/help-grub
>

Since I can't find any good documentation on grub2: ls
/usr/lib/grub/i386-pc/  Doesn't show anything remotely like btrfs.
Even if you made one of those grub2 payload images it still won't be
able to read the filesystem to get your kernel and initrd loaded.
You'll probably have to use a 32 to 128 megabyte boot partition with
something grub can work with, like ext2/3 on it.  After the kernel and
initrd are loaded you can use any filesystems that the kernel or
initrd userspace supports.