lvm does not work when included in core.img [resend]

lvm does not work when included in core.img [resend]

[Jan Nieuwenhuizen]

[resend from 2007-12-08]

Hi,

I'm trying out Grub2 to for a setup with root on lvm, and it
almost works :-) (grub2 looks great, btw!)  If I install grub on a
non-lvm partition without lvm preloaded in core.img, it works
fine.  It looks as if the lvm module is defunct when it is loaded
from core.img: ls shows no lvm devices.

Whenever I `insmod lvm' after grub starts (ie: from the grub
rescue command line reading from a non-lvm partition, or from
within grub.cfg with grub's root and grub.cfg on a non-lvm
partition), ls will show my lvm devices.

Here is what I do

    grub-mkimage --output=/boot/grub/core.img lvm ext2 pc gpt biosdisk
    grub-setup --root-device='(lvmraid-lvm0)' '(hd0)'

(no errors)

    mount |grep '/ '
    /dev/mapper/lvmraid-lvm0 on / type ext3 (rw,errors=remount-ro)

(reboot)

    grub rescue> set
    prefix=(lvmraid-lvm0)/boot/grub
    root=lvmraid-lvm0
    grub rescue> insmod normal
    error: unknown device
    grub rescue> lsmod
    Name  Ref Count  Dependencies
    biosdisk 1
    gpt 1
    pc 1
    ext2 1 fshelp
    fshelp 2
    lvm 1
    grub rescue> ls
    (hd0) (hd0,1) (hd0,5) (hd0,6) (hd0) (hd1,1) (hd1,5) (hd1,6)
    grub rescue> rmmod lvm
    grub rescue> insmod (hd1,1)/boot/grub/lvm.mod
    grub rescue> ls
    (lvmraid-lvm0) ...
    grub rescue> insmod normal
    grub rescue> normal

and the menu appears.

Any ideas?  I'm using grub-pc 20071101-CVS from Ubuntu (on x86_64),
but I also tried a core.img built using today's CVS.

Greetings,
Jan.


/boot/grub/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automaticaly generated by /usr/sbin/update-grub using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
set default=2
set timeout=5
set root=(lvmraid-lvm0)
font (lvmraid-lvm0)/usr/share/grub/unifont.pff
set gfxmode=640x480
insmod gfxterm
insmod vbe
terminal gfxterm
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_hurd ###
### END /etc/grub.d/10_hurd ###

### BEGIN /etc/grub.d/10_linux ###
menuentry "Debian GNU/Linux, linux 2.6.22-14-generic" {
        linux   (lvmraid-lvm0)/boot/vmlinuz-2.6.22-14-generic
root=/dev/mapper/lvmraid-lvm0 ro 
        initrd  (lvmraid-lvm0)/boot/initrd.img-2.6.22-14-generic
}
menuentry "Debian GNU/Linux, linux 2.6.22-14-generic (single-user
mode)" {
        linux   (lvmraid-lvm0)/boot/vmlinuz-2.6.22-14-generic
root=/dev/mapper/lvmraid-lvm0 ro single 
        initrd  (lvmraid-lvm0)/boot/initrd.img-2.6.22-14-generic
}
menuentry "Debian GNU/Linux, linux 2.6.20-16-generic" {
        linux   (lvmraid-lvm0)/boot/vmlinuz-2.6.20-16-generic
root=/dev/mapper/lvmraid-lvm0 ro 
        initrd  (lvmraid-lvm0)/boot/initrd.img-2.6.20-16-generic-lvm0
}
menuentry "Debian GNU/Linux, linux 2.6.20-16-generic (single-user
mode)" {
        linux   (lvmraid-lvm0)/boot/vmlinuz-2.6.20-16-generic
root=/dev/mapper/lvmraid-lvm0 ro single 
        initrd  (lvmraid-lvm0)/boot/initrd.img-2.6.20-16-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
        linux   (lvmraid-lvm0)/boot/memtest86+.bin
}
### END /etc/grub.d/20_memtest86+ ###

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond - The music typesetter
http://www.xs4all.nl/~jantien       | http://www.lilypond.org

Re: lvm does not work when included in core.img [resend]

[Robert Millan]

On Tue, Jan 08, 2008 at 10:48:41AM +0100, Jan Nieuwenhuizen wrote:
> [resend from 2007-12-08]
> 
> Hi,
> 
> I'm trying out Grub2 to for a setup with root on lvm, and it
> almost works :-) (grub2 looks great, btw!)  If I install grub on a
> non-lvm partition without lvm preloaded in core.img, it works
> fine.  It looks as if the lvm module is defunct when it is loaded
> from core.img: ls shows no lvm devices.
> 
> Whenever I `insmod lvm' after grub starts (ie: from the grub
> rescue command line reading from a non-lvm partition, or from
> within grub.cfg with grub's root and grub.cfg on a non-lvm
> partition), ls will show my lvm devices.

It's a known bug, but nobody has time to fix it.

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call, if you are unable to speak?
(as seen on /.)

Re: lvm does not work when included in core.img [resend]

[Robert Millan]

On Tue, Jan 08, 2008 at 10:48:41AM +0100, Jan Nieuwenhuizen wrote:
> 
> Here is what I do
> 
>     grub-mkimage --output=/boot/grub/core.img lvm ext2 pc gpt biosdisk

To be more specific, grub-install already knows how to figure out that
you need `ext2', and whether you need `pc' or `gpt' (you don't need both),
but it needs to learn how to detect that lvm is needed.

There are other problems, I think, but this is the one that comes to mind
right now.

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call, if you are unable to speak?
(as seen on /.)

Re: lvm does not work when included in core.img [resend]

[Jan Nieuwenhuizen]

Robert Millan writes:

> >     grub-mkimage --output=/boot/grub/core.img lvm ext2 pc gpt biosdisk
> 
> To be more specific, grub-install already knows how to figure out that
> you need `ext2', and whether you need `pc' or `gpt' (you don't need both),
> but it needs to learn how to detect that lvm is needed.

Yes, I found that too, but that's of little use if lvm does not work
when it's included in core.img.  I figured: first report a bug on grub,
only once that works go for grub-install?

> There are other problems, I think, but this is the one that comes to mind
> right now.

I don't care so much for grub-install.

Greetings,
Jan.

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond - The music typesetter
http://www.xs4all.nl/~jantien       | http://www.lilypond.org

Re: lvm does not work when included in core.img [resend]

[Jan Nieuwenhuizen]

Robert Millan writes:

> > It looks as if the lvm module is defunct when it is loaded
> > from core.img: ls shows no lvm devices.

> It's a known bug, but nobody has time to fix it.

Ah, that's a pity.  Booting from lvm that's one of grub2's major
features from my point of view... 

Any hints on how I could dive into this?

Greetings,
Jan.

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond - The music typesetter
http://www.xs4all.nl/~jantien       | http://www.lilypond.org

Re: lvm does not work when included in core.img [resend]

[Robert Millan]

On Tue, Jan 08, 2008 at 04:05:35PM +0100, Jan Nieuwenhuizen wrote:
> Robert Millan writes:
> 
> > > It looks as if the lvm module is defunct when it is loaded
> > > from core.img: ls shows no lvm devices.
> 
> > It's a known bug, but nobody has time to fix it.
> 
> Ah, that's a pity.  Booting from lvm that's one of grub2's major
> features from my point of view... 
> 
> Any hints on how I could dive into this?

If you mean getting lvm loaded, see my other mail.  Otherwise, can you
describe your problem ?  When I said it's a known bug I was referring to
the grub-install part.

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call, if you are unable to speak?
(as seen on /.)

Re: lvm does not work when included in core.img [FIXED]

[Jan Nieuwenhuizen]

Jan Nieuwenhuizen writes:

>     grub-mkimage --output=/boot/grub/core.img lvm ext2 pc gpt biosdisk
>     grub-setup --root-device='(lvmraid-lvm0)' '(hd0)'

For the record: lvm should be last, ie

   grub-mkimage --output=/boot/grub/core.img ext2 pc gpt biosdisk lvm

works for me [pc gpt] is optional, but quite handy if you have non-lvm
partitions around.

Jan.

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond - The music typesetter
http://www.xs4all.nl/~jantien       | http://www.lilypond.org

Re: lvm does not work when included in core.img [FIXED]

[Robert Millan]

On Wed, Jan 09, 2008 at 12:21:56PM +0100, Jan Nieuwenhuizen wrote:
> Jan Nieuwenhuizen writes:
> 
> >     grub-mkimage --output=/boot/grub/core.img lvm ext2 pc gpt biosdisk
> >     grub-setup --root-device='(lvmraid-lvm0)' '(hd0)'
> 
> For the record: lvm should be last, ie
> 
>    grub-mkimage --output=/boot/grub/core.img ext2 pc gpt biosdisk lvm
> 
> works for me [pc gpt] is optional, but quite handy if you have non-lvm
> partitions around.

Hi Jan,

I can't get the layout you described using debian-installer.  Please can you
tell me how to reproduce your problem?  Which layout do I have to setup, etc.

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call… if you are unable to speak?
(as seen on /.)