Christoph Groth wrote (ao):
> I'm trying to install current Debian testing (=kernel version 3.2) with
> btrfs as the root file system. There is also a small ext3 /boot
> partition.
>
> I create a btrfs raid1 file system with the command
>
> mkfs.btrfs -d raid1 /dev/sda2 /dev/sdb2
>
> Then I can mount it and finish the installation successfully. Booting
> doesn't work, however: initrd complains that it cannot mount /dev/sda2:
> "Invalid argument".
>
> The funny thing is, that in the initrd console I can mount /dev/sdb2!
> So I changed the kernel parameter in grub.cfg to mount /dev/sdb2
> instead, but the problem persists: Now I can mount /dev/sda2 in the
> initrd console!
>
> In fact, when I boot a rescue system from a thumbdrive, the same thing
> happens:
>
> # mount -t btrfs /dev/sda2 /mnt
> mount: mounting /dev/sda2 on /mnt failed: Invalid argument
> # mount -t btrfs /dev/sdb2 /mnt
> #
>
> When I keep trying to mount the same device, it keeps failing. When I
> start mounting /dev/sdb2, it works for /dev/sda2...
>
> Isn't this very weird? Any ideas?
You might need 'btrfs device scan' before you can mount a multi-device
filesystem.
Sander
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