[linux-lvm] mount root filesystem on lvm

[Manfred Gschweidl]

hello,

thanks for your response. ;-)

i have one more question: what does your "lilo.conf" look like???
especially the "root=...." parameter ist he most interesting one. how 
does it need to be named with device-mapper???

thanks for any reply again,


manfred





Christophe Saout wrote:
> Am Fre, 2003-05-09 um 21.19 schrieb Manfred Gschweidl:
> 
> 
>>was anyone successfull with booting the root-filesystem on am lvm-volume 
>>with lvm2 and device-mapper interface, using an initial ramdisk??
>>
>>can anyone point me in the right direction??
> 
> 
> I built my own ramdisk for that purpose (loosely based on the old LVM1
> ramdisk). It's contains the following files:
> 
> -rwxr-xr-x  1 root root  442740 Dec 13 00:48 bin/bash
> -rwxr-xr-x  1 root root   17196 Nov  7  2002 bin/mknod
> -rwsr-xr-x  1 root root   60896 Jan 20  2002 bin/mount
> -rwxr-xr-x  1 root root   46692 Nov  7  2002 bin/sed
> -rwxr-xr-x  1 root root    4948 Dec 25 18:02 bin/true
> -rwsr-xr-x  1 root root   27524 Jan 20  2002 bin/umount
> -rw-r--r--  1 root root      66 Jan 11 17:17 etc/fstab
> -rw-r--r--  1 root root   16932 Dec 12 23:36 etc/modprobe.conf
> -rw-r--r--  1 root root      24 Jan 11 17:17 etc/mtab
> -rwxr-xr-x  1 root root   91790 Nov  7  2002 lib/ld-linux.so.2
> -rwxr-xr-x  1 root root 1193240 Nov  7  2002 lib/libc.so.6
> -rwxr-xr-x  1 root root   17300 Nov  7  2002 lib/libdevmapper.so.0.96
> -rwxr-xr-x  1 root root    9140 Nov  7  2002 lib/libdl.so.2
> -rwxr-xr-x  1 root root   23256 Dec 12 23:56 lib/libhistory.so.4
> -rwxr-xr-x  1 root root  289484 Jan 20  2002 lib/libncurses.so.5
> -rwxr-xr-x  1 root root  156144 Dec 13 00:39 lib/libreadline.so.4
> -r-xr-xr-x  1 root root     433 Dec 25 18:24 linuxrc
> -rwxr-xr-x  1 root root    5876 Jan 11 17:15 sbin/insmod
> -r-xr-xr-x  1 root root  329956 Jan 11 17:13 sbin/lvm
> -rwxr-xr-x  1 root root   18556 Jan 11 17:15 sbin/modprobe
> 
> Note: I'm using kernel 2.5.69, so instead of modprobe.conf you should
> use modules.conf, the only purpose of this file in conjunction with
> modprobe is to suppress a lot of kernel messages that say it couldn't
> load the module for major blabla). The shared libraries were used by my
> bash, you can check that with ldd.
> 
> The shell script /linuxrc looks like this (note: I removed the
> indentation to fit everything into one line, you might want to correct
> this):
> 
> #!/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 -a y
> /bin/umount /proc
> 
> The other text files contain this:
> 
> chtephan:/mnt/tmp # cat etc/mtab
> /dev/ram0 / ext2 rw 0 0
> chtephan:/mnt/tmp # cat etc/fstab
> /dev/ram0       /               ext2    defaults        0   0
> proc            /proc           proc    defaults        0   0
> 
> You can also find this ramdisk under
> http://www.saout.de/misc/initrd-2.5.67-lvm2-athlon.gz - as the name
> suggets my libc is athlon optimized, so you might want to replace some
> libraries or executables.
> 
> BTW: I've also got some lilo patches on that page (remove the filename
> after the last slash) that make it recognize device-mapper volumes.
>