[linux-lvm] LVM 1.03 root file system on Redhat 7.3

[linux-lvm] LVM 1.03 root file system on Redhat 7.3

[James B. Byrne]

We are using the grub bootloader.  We have followed the 
instructions contained in the the lvm howto document provided by 
sistina, to the best of my ability to understand them.

The problem is that system gives a kernel panic when started using 
the lvm boot option.  Is there a way to redirect the boot dialogue 
output to a file?  It appears that the most informative messages may 
be scrolling of the top of the screen.  What I am seeing is this:

kmod: failed to exec /sbin/modeprobe -s -k block-major-7 errno = 2 

repeated 16 times, followed by

vgvchange -- volume group "vg00" successfully activated

VFS: Cannot open root device "vg00"/lv01: or 00:00
Please append correct "root=" boot option
Kernel panic: VFS: Unable to mount root fs on 00:00

Help?

Regards,
Jim
---     e-mail is NOT a secure channel 
James B. Byrne                mailto:ByrneJB@Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3

Re: [linux-lvm] LVM 1.03 root file system on Redhat 7.3

[Thierry DE CARVALHO]

"James B. Byrne" wrote:
> 
> We are using the grub bootloader.  We have followed the
> instructions contained in the the lvm howto document provided by
> sistina, to the best of my ability to understand them.
> 
> The problem is that system gives a kernel panic when started using
> the lvm boot option.  Is there a way to redirect the boot dialogue
> output to a file?  It appears that the most informative messages may
> be scrolling of the top of the screen.  What I am seeing is this:
> 
> kmod: failed to exec /sbin/modeprobe -s -k block-major-7 errno = 2
> 
> repeated 16 times, followed by
> 
> vgvchange -- volume group "vg00" successfully activated
> 
> VFS: Cannot open root device "vg00"/lv01: or 00:00
> Please append correct "root=" boot option
> Kernel panic: VFS: Unable to mount root fs on 00:00

The problem is that at this time the kernel don't known anything about
your LVs and their major/minor ! (the root FS is not mounted).
It uses an internal table for translating /dev/hda* and others to 
major/minor(see init/main.c).

Try with grub (here /dev/vg00/lvol1 is the root fs):

title=GNU/Linux Debian 2.2 (potato)
kernel (hd0,1)/vmlinuz-2.2.19 root=3a00 ramdisk_size=8192 vga=10
#                                   ^^^^ <major><minor> of the lv device in hex
initrd (hd0,1)/initrd-lvm-2.2.19.gz

Re: [linux-lvm] LVM 1.03 root file system on Redhat 7.3

[Daniel Savard]

le jeu 30-05-2002 à 02:22, James B. Byrne a écrit :

> 
> We are using the grub bootloader.  We have followed the 
> instructions contained in the the lvm howto document provided by 
> sistina, to the best of my ability to understand them.
> 
> The problem is that system gives a kernel panic when started using 
> the lvm boot option.  Is there a way to redirect the boot dialogue 
> output to a file?  It appears that the most informative messages may 
> be scrolling of the top of the screen.  What I am seeing is this:
> 
> kmod: failed to exec /sbin/modeprobe -s -k block-major-7 errno = 2 
> 
> repeated 16 times, followed by
> 
> vgvchange -- volume group "vg00" successfully activated
> 
> VFS: Cannot open root device "vg00"/lv01: or 00:00
> Please append correct "root=" boot option
> Kernel panic: VFS: Unable to mount root fs on 00:00
> 
> Help?
> 
> Regards,
> Jim
> ---     e-mail is NOT a secure channel 
> James B. Byrne                mailto:ByrneJB@Harte-Lyne.ca
> Harte & Lyne Limited          http://www.harte-lyne.ca
> 9 Brockley Drive              vox: +1 905 561 1241
> Hamilton, Ontario             fax: +1 905 561 0757
> Canada  L8E 3C3
> 

Although I am using lilo, I suppose it is the same problem I
encountered.

Don't know GRUB, but I suppose there is a line which specify your root
filesystem. You should have something like: /dev/myvg/mylv instead of
/dev/sdaX or /dev/hdaX or any disk name.

Regards,
-- 

=======================================
Daniel Savard
Consultation Informatique Daniel Savard
551, boul. Sir-Wilfrid-Laurier
suite 105
Beloeil, (Québec)
Canada J3G 4J1

Tél: (450) 467-8014
Internet: dsavard@cids.ca
=======================================