Re: booting from a raid1

[Tom H]

On Fri, Oct 1, 2010 at 10:30 AM, lee <address@hidden> wrote:
> On Fri, Oct 01, 2010 at 03:49:28PM +0200, lee wrote:
>> On Fri, Oct 01, 2010 at 09:25:19AM -0400, Tom H wrote:
>> > On Fri, Oct 1, 2010 at 8:50 AM, lee <address@hidden> wrote:
>> > > On Fri, Oct 01, 2010 at 12:22:28PM +0200, Emil Micek wrote:
>> > >> On Fri, 1 Oct 2010, lee wrote:
>
>> > >> As far as i know grub2 can't boot from raid arrays with version 1.2
>> > >> metadata superblock. At least your /boot partition must reside on
>> > >> RAID with version 0.9 superblock.
>> > >
>> >  grub2  (1.98+20100720-1) unstable; urgency=low
>>
>> There seems to be version 1.98+20100 in testing, so it should work:
>>
>> yun:~# apt-cache show grub2
>> Version: 1.98+20100804-4
>>
>> need to/can I somehow use chroot to switch to the new root partition
>> and then use grub-install or grub-mkconfig from there so that it will
>> create the grub.cfg as needed?
>
> Ok, I tried with chroot, but grub-install doesn't create a grub.cfg at
> all. It only warns about improperly nested partitions and an unknown
> filesystem as before but says the installation finished with no
> errors.
>
> When running grub-mkconfig, I'm getting the following output (letting
> aside the warnings and the error message about the unknown filesystem):
>
> ### BEGIN /etc/grub.d/00_header ###
> if [ -s $prefix/grubenv ]; then
>  load_env
> fi
> set default="0"
> if [ "${prev_saved_entry}" ]; then
>  set saved_entry="${prev_saved_entry}"
>  save_env saved_entry
>  set prev_saved_entry=
>  save_env prev_saved_entry
>  set boot_once=true
> fi
>
> function savedefault {
>  if [ -z "${boot_once}" ]; then
>    saved_entry="${chosen}"
>    save_env saved_entry
>  fi
> }
>
> function load_video {
>  insmod vbe
>  insmod vga
>  insmod video_bochs
>  insmod video_cirrus
> }
>
> insmod raid
> insmod mdraid
> insmod part_msdos
> insmod part_msdos
>
> ... and that's all. The last line when grub-mkconfig prints to stdout is:
>
> /usr/sbin/grub-probe: error: unknown filesystem.
>
>
> All the partitions use ext4. Doesn't grub know about ext4?

What filesystems did you mount before chrooting?