RE: GRUB + LVM + Raid 1 and 6

[Gregg C Levine]

Hello!
It is because GRUB doesn't see the entire LVM tree. Ideally GRUB needs a
single small partition containing the necessary things to boot your system,
and then string together the LVM tree.

I should also mention, (especially since I included the BUG-GRUB list in the
CC: area) the rest of the people there should have an idea as to where
things are going.

Now here's a funny thought, have you brought this to the attention of the
people behind Fedora at one of their forums?
--
Gregg C Levine address@hidden
"The Force will be with you always." Obi-Wan Kenobi
  


> -----Original Message-----
> From: roger p [mailto:address@hidden
> Sent: Monday, January 07, 2008 2:02 PM
> To: Gregg C Levine
> Subject: RE: GRUB + LVM + Raid 1 and 6
> 
> 
> It works very well with RAID only, but when you put LVM on top of the md1
then the
> problems occur.
> 
> Here is the menu.lst
> 
> boot=/dev/md0
> default=0
> timeout=5
> splashimage=(hd0,0)/grub/splash.xpm.gz
> hiddenmenu
> title Fedora (2.6.23.9-85.fc8)
>         root (hd0,0)
>         kernel /vmlinuz-2.6.23.9-85.fc8 ro root=/dev/VolGroup00/LogVol00
rhgb quiet
>         initrd /initrd-2.6.23.9-85.fc8.img
> title Fedora (2.6.23.1-42.fc8)
>         root (hd0,0)
>         kernel /vmlinuz-2.6.23.1-42.fc8 ro root=/dev/VolGroup00/LogVol00
rhgb quiet
>         initrd /initrd-2.6.23.1-42.fc8.img
> 
> 
> Maybe it is possible to first install the RAID and then on top of md1 put
the LVM
> afterwards.....but it wont be possible I guess.....
> 
> What is the actual problem? Why doesn't it play together?
> 
> CK
> 
> ----------------------------------------
> > From: address@hidden
> > To: address@hidden; address@hidden
> > Subject: RE: GRUB + LVM + Raid 1 and 6
> > Date: Mon, 7 Jan 2008 13:21:12 -0500
> >
> > Hello!
> > I remember from an earlier discussion with someone else. That despite
the
> > well meaning intentions of the developers behind LVM and Raid drive
frames,
> > and the folks at Red Hat, it is necessary to do these things. And those
> > things are to create your boot partition away from where the whole LVM
> > business starts. Also make sure you have a working initial root device,
or
> > initial root file system, as depending on your kernel.
> >
> > Also please contribute if possible a listing of your menu list file for
> > GRUB.
> >
> > --
> > Gregg C Levine address@hidden
> > "The Force will be with you always." Obi-Wan Kenobi
> >
> >
> >
> >> -----Original Message-----
> >> From: address@hidden
> > [mailto:bug-grub-
> >> address@hidden On Behalf Of roger p
> >> Sent: Monday, January 07, 2008 4:22 AM
> >> To: address@hidden
> >> Subject: GRUB + LVM + Raid 1 and 6
> >>
> >>
> >>  I have installed Fedora Core 8 in a machine with 4 disks each 200
> >>  GBytes; sda, sdb, sdc, sdd
> >>
> >>  the partitioning is the following:
> >>
> >>  md0: /boot     (Raid-1 (2 disks + 2 spare disks))
> >>  md1: /            (RAID-6, (4 disks) + LVM)
> >>  - the LVM has logical volumes:
> >>    - / for the linux (00)
> >>    - /home the rest (02)
> >>    - swap (01)
> >>
> >>  When I now start the server it stops without any GRUB menu coming up,
> >>  the error message "GRUB hard disk error" is displayed.
> >>
> >>  When I start through the linux rescue it works fine. It reads the hard
> >>  disk and no problem when I do the chroot /mnt/sysimage
> >>
> >>  What is the problem? It seems that the hard disk ctructure can not be
> >>  read by GRUB.
> >>
> >>  What to do?
> >>
> >> CK
> >> _________________________________________________________________
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> >
> 
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