[linux-lvm] Problems with initrd for LVM2 on 2.6.0-test8 and -test9 kernels.. .

[linux-lvm] Problems with initrd for LVM2 on 2.6.0-test8 and -test9 kernels.. .

[Weber, Geoffrey M.]

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Greetings all,

I have been having quite a few problems getting a server I am setting up to
use root on a LVM2 setup.  I used the "lvmcreate_initrd" script as suggested
on the 'net, and also tried to hand-edit some of the LVM2 requirements into
that initrd image (such as the /dev/mapper/control mknod command from the
initialization script and /lib/devmapper.so library).  As soon as I try to
use LILO or GRUB with the "root=/dev/vg00/root" or "root=3f00" (device major
and minor numbers), my machine hangs after "Uncompressing Linux... Ok,
booting the kernel.".

I have also tried (unsuccessfully) to use an initrd image I found on the
'net at http://www.comedia.it/~bluca/cooker/lvm2/

.. and also tried modifying this to work (along with the evms-supplied
initrd image).  All hang at the same point.  I got an idea to start a shell
inside the initrd image when booting on my setup root partition to see what
I could find out. When trying to use the Busybox "ash" command inside the
modified evms initrd image, however, the machine doesn't halt and give me a
shell at all but keeps booting.

Is there something that I can try out or that I am overlooking?

Thanks,
    Geoff



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Re: [linux-lvm] Problems with initrd for LVM2 on 2.6.0-test8 and -test9 kernels.. .

[Luca Berra]

On Wed, Oct 29, 2003 at 09:26:14AM -0600, Weber, Geoffrey M. wrote:
>   library).    As   soon  as  I  try  to  use  LILO  or  GRUB  with  the
>   "root=/dev/vg00/root" or "root=3f00" (device major and minor numbers),
>   my  machine  hangs  after  "Uncompressing  Linux...  Ok,  booting  the
>   kernel.".
could you give us some more details about your setup, including actual
lines from your configuration.

>   I  have  also tried (unsuccessfully) to use an initrd image I found on
>   the 'net at [1]http://www.comedia.it/~bluca/cooker/lvm2/

There is no initrd image at that location.
What you find there is modified Mandrake rpm to support lvm2 in Mandrake
Linux 9.2/cooker, and has not been tested with anything different than
that.

>   to  see  what  I  could find out. When trying to use the Busybox "ash"
>   command  inside  the  modified evms initrd image, however, the machine
>   doesn't halt and give me a shell at all but keeps booting.
i saw this problem as well, i don't know if it is caused by some device
file missing in the initrd image or what.

L.

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
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RE: [linux-lvm] Problems with initrd for LVM2 on 2.6.0-test8 and -test9 kernels.. .

[Weber, Geoffrey M.]

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My apologies for not providing the information earlier... and for my mistake
in supplying the link to my initrd image.  I have been bookmarking sites
like mad and apparently chose the wrong one...

Here is my linuxrc inside the initrd image (this is the one based off of the
evms initrd I found on the web, since it seemed the most complete).

Please note that I still can't get the "/bin/ash" command to work properly,
though I'm working on it.  I did put in the /dev/tty* and /dev/pt* nodes
into the initrd image, but still no luck.  



-------- CUT --------

gweber@windforce:/tmp/test$ more linuxrc
#!/bin/sh
/bin/mount /proc
echo /sbin/modprobe > /proc/sys/kernel/modprobe
if test ! -e /dev/.devfsd ; then
        set -e
        MAJOR=$(/bin/sed -n 's/^ *\([0-9]\+\) \+misc$/\1/p' /proc/devices)
        MINOR=$(/bin/sed -n 's/^ *\([0-9]\+\) \+device-mapper$/\1/p'
/proc/misc
)
        if test -n "$MAJOR" -a -n "$MINOR" ; then
                /bin/mknod --mode=600 /dev/mapper/control c $MAJOR $MINOR
        fi
fi
/sbin/lvm vgchange --ignorelockingfailure -P -a y
/bin/ash
/bin/umount /proc

-------- CUT --------

Also note that I have tried "root=0a3f", "root=fe00", and
"root=/dev/vg00/root"... the major/minor numbers are listed here (from
/dev/hda4 "temporary install" root):

-------- CUT --------

gweber@windforce:~$ ls -l /dev/mapper
crw-------    1 root     root      10,  63 Oct 27 13:34 control
brw-------    1 root     root     254,   1 Oct 22 08:56 vg00-home
brw-------    1 root     root     254,   0 Oct 22 08:56 vg00-root
brw-------    1 root     root     254,   3 Oct 29 08:21 vg00-tmp
brw-------    1 root     root     254,   4 Oct 29 08:21 vg00-usr
brw-------    1 root     root     254,   2 Oct 29 08:21 vg00-var

-------- CUT --------

In order to (try to) make this work, I did copy all the "missing" binaries,
libs, and dev nodes into the evms initrd image.  I would supply that
listing, but it would be quite long...

Here is my menu.lst from grub.  I've been testing with grub just so that I
could enter changes at boot time instead of running "lilo" all over the
place.

-------- CUT --------

gweber@windforce:/tmp/test$ more menu.lst
# Author: Luis R. Rodriguez <mcgrof@ruslug.rutgers.edu>
# GRUB configuration example file

# Should give you an idea of how to use GRUB to dual boot

# This makes Linux the default ;) Use 1 if you want Windows as default
default=1

# This means that from now on, GRUB will parse / as (hd0,0)/
root    (hd0,3)

# Fun splashimage ;-)
# Check http://ruslug.rutgers.edu/~mcgrof/grub-images for a HOWTO
# on making GRUB splashimages.
#
# I recommend putting all GRUB splashimages in /boot/grub/images
# to not bloat the /boot/grub directory ;)
splashimage (hd0,0)/grub/images/debian_cooleye-dither.xpm.gz

# vga=xxx sets the framebuffer console to a specific resolution.
# Here is a table you can use so it can help you decide
# what resolution you want to use:
#       colour          depth   | 640x480  800x600  1024x768 1280x1024
#       256             (8bit)  |  769      771       773      775
#       32000           (15bit) |  784      787       790      793
#       65000           (16bit) |  785      788       791      794
#       16.7 Mill.      (24bit) |  786      789       792      795


# As you will see I have my kernels in /boot/kernels/
# I have found that GRUB allows for a easy-to-use structured and neat
# /boot/ directory. My /boot/ has:
# configs/ kernels/ initrds/ System.maps/ vmlinuxes/
# Looks much nicer than the bloated default /boot/ most distributions use :P

# Ugh... :( you poor thing
#title  Windows XP
#rootnoverify   (hd0,0)
# Windows 9x, ME line: chainloader+1
# WIndows XP line:
#chainloader = (hd0,0)+1

# Yay, viva gorditas
#title  Debian/X11/GNOME/GNU/etc Linux (2.4.18-bf2.4)
#kernel /boot/kernels/vmlinuz-2.4.18-bf2.4 root=/dev/hda5 console=ttys0
vga=791
title   Linux (2.6.0-lvm)
kernel  (hd0,0)/vmlinuz-2.6.0-test9-aa0.2 root=fe00 console=ttys0
initrd  (hd0,0)/initrd-gw.gz

title   Linux (2.6.0)
kernel  (hd0,0)/boot/vmlinuz-2.6.0-test9-aa0.2 root=/dev/hda4 console=ttys0
vga
=791
#initrd  (hd0,3)/boot/initrd-lvm-2.6.0-test8-aa0.1.gz

title   Linux (2.4.22-xfs)
kernel  (hd0,3)/boot/vmlinuz-2.4.22-xfs root=/dev/hda4 console=ttys0 vga=791
initrd  (hd0,3)/boot/initrd.gz


-------- CUT --------

Thanks in advance!!

    Geoff


 

-----Original Message-----
From: Luca Berra
To: Weber, Geoffrey M.
Cc: 'linux-lvm@sistina.com'
Sent: 10/30/2003 7:49 AM
Subject: Re: [linux-lvm] Problems with initrd for LVM2 on 2.6.0-test8 and
-test9 kernels.. .

On Wed, Oct 29, 2003 at 09:26:14AM -0600, Weber, Geoffrey M. wrote:
>   library).    As   soon  as  I  try  to  use  LILO  or  GRUB  with
the
>   "root=/dev/vg00/root" or "root=3f00" (device major and minor
numbers),
>   my  machine  hangs  after  "Uncompressing  Linux...  Ok,  booting
the
>   kernel.".
could you give us some more details about your setup, including actual
lines from your configuration.

>   I  have  also tried (unsuccessfully) to use an initrd image I found
on
>   the 'net at [1]http://www.comedia.it/~bluca/cooker/lvm2/

There is no initrd image at that location.
What you find there is modified Mandrake rpm to support lvm2 in Mandrake
Linux 9.2/cooker, and has not been tested with anything different than
that.

>   to  see  what  I  could find out. When trying to use the Busybox
"ash"
>   command  inside  the  modified evms initrd image, however, the
machine
>   doesn't halt and give me a shell at all but keeps booting.
i saw this problem as well, i don't know if it is caused by some device
file missing in the initrd image or what.

L.

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
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or disclosure by any other person is strictly prohibited. If you have
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Re: [linux-lvm] Problems with initrd for LVM2 on 2.6.0-test8 and -test9 kernels.. .

['Luca Berra ']

On Thu, Oct 30, 2003 at 09:46:52AM -0600, Weber, Geoffrey M. wrote:
>My apologies for not providing the information earlier... and for my mistake
>in supplying the link to my initrd image.  I have been bookmarking sites
>like mad and apparently chose the wrong one...
if you even quit posting in multipart/alternative i'll be an happy man
:))))

>Here is my linuxrc inside the initrd image (this is the one based off of the
>evms initrd I found on the web, since it seemed the most complete).
>
>Please note that I still can't get the "/bin/ash" command to work properly,
>though I'm working on it.  I did put in the /dev/tty* and /dev/pt* nodes
>into the initrd image, but still no luck.  

here's the initrd i produce (shell is modified mdk/redhat nash)
note that i mount manually the root fs then i pivot_root.

-------------------------------------------------
... load modules ...
echo Mounting /proc filesystem
mount -t proc /proc /proc
echo Creating device files
mkdevices /dev
echo Activating md devices
mknod /dev/md1 b 9 1
mdassemble
echo Scanning logical volumes
vgscan
echo Activating logical volumes
vgchange -ay
echo 0x0100 > /proc/sys/kernel/real-root-dev
echo Mounting root filesystem
mount -o defaults --ro -t ext3 /dev/vg00/lvol1 /sysroot
pivot_root /sysroot /sysroot/initrd
echo Remounting devfs at correct place if necessary
handledevfs
umount /initrd/proc
-------------------------------------------------
mkdevices: creates device files based on /proc/partitions (if not devfs)
mdassemble: diet-libc version of mdadm --assemble (cannot build full
mdadm with diet-libc)
handledevfs: is described in the comment above

>Here is my menu.lst from grub.  I've been testing with grub just so that I
>could enter changes at boot time instead of running "lilo" all over the
>place.
you can append options to lilo command lines (just type 'em)

>-------- CUT --------
>
>gweber@windforce:/tmp/test$ more menu.lst
>default=1
>root    (hd0,3)
>splashimage (hd0,0)/grub/images/debian_cooleye-dither.xpm.gz
>vga=791
>title   Linux (2.6.0-lvm)
>kernel  (hd0,0)/vmlinuz-2.6.0-test9-aa0.2 root=fe00 console=ttys0
>initrd  (hd0,0)/initrd-gw.gz
                                                     ^^^^^^^^^^^^^
ttys0 ???
i tought serial console was ttyS0,<speed>

L.

-- 
Luca Berra -- bluca@comedia.it
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