Public bug reported:
After adding second disk to BTRFS volume, Ubuntu 11.04 will no-longer
boot. See response from the BTRFS development list.
On Sat, Apr 30, 2011 at 09:42:39PM +0100, A. James Lewis wrote:
>
> After completing an installation of Ubuntu 11.04 with a separate /boot
> partition and BTRFS as the main filesystem (Ubuntu creates subvolumes for
> / and /home).
>
> sda1 being the GPT stuff
> sda2 being most of the disk as BTRFS
> sda3 being /boot
> sda4 being swap
>
> sdb having an identical partition table...
>
> I patched everything up to date, rebooted to make sure that all was ok..
> and then ran:-
>
> btrfs device add /dev/sdb2 /
> sync
> reboot
>
> The system stops in initrd unable to find the root filesystem...
>
> It's my understanding that nothing should change here, am I missing
> something, I don't see how it can even tell I've added more storage, let
> alone fail to boot.
In order to mount a multi-volume btrfs filesystem, the kernel needs
to know all of the devices that make up the filesystem. It can't do
that itself, so it needs some userspace assistance. Your system needs
to run "btrfs dev scan" from the initrd before attempting to mount the
root filesystem. On Debian, installing btrfs-tools will (I believe)
set that up.
To get the system booting again temporarily, you could try adding
the option "mount=device=/dev/sda2,device=/dev/sdb2" (I think) to the
kernel command-line parameter in your boot loader. That should give
enough information to the initrd to be able to find the volumes that
your btrfs lives on, and get you enough of a system that you can work
out what's wrong with your initrd.
Hugo.
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: btrfs-tools 0.19+20100601-3ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
Date: Sat Apr 30 23:34:14 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
LANGUAGE=en_GB:en
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: btrfs-tools
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: amd64 apport-bug natty
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https://bugs.launchpad.net/bugs/774502
Title:
Ubuntu 11.04 initrd fails to boot mult-volume BTRFS filesystem
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