I am trying to move my root and swap to a raid mirror with lvm in the raid partition.
When I boot, this is what I see:
Volume group "root" not found
Begin: Waiting for root file system... ...
then after a long wait...
Check root= bootarg cat /proc/cmdline
or missing modules, devices: cat /proc/modules ls /dev
ALERT! /dev/array0/root0 does not exist. Dropping to a shell!
After some poking around, I see /dev/md0 and /dev/md1 are there in the initramfs shell, what's not happening is the lvm does not seem to be kicking in, hence, it's not able to find my /dev/array0/root0 lvm.
Fortunately I can still boot single user mode.
I looked in initrd.img-2.6.18-6-686 with zcat|cpio -t and I see lib/libdevmapper.so.1.02. What it seems to me is that the lvm init script or whatever sets up the /dev/vgname/lvname stuff in /dev isn't getting run, or maybe lvm isn't in there at all really.
Some poking around turned up this page: http://www.tldp.org/HOWTO/LVM-HOWTO/lvm2_boot.html
which talks about adding:
vgchange -ay --ignorelockingfailure
this to a linuxrc, but I'm not sure where to add that. Furthermore, I don't see any of those commands: dmsetup, cgscan, or vgchange in the initrd.img-2.6.18-6-686.
I have run update-initramfs several times and copied the resulting new files to /dev/md0, but for some reason, update-initramfs does not seem to be creating the correct script to initialize the lvm stuff.
Probably there is a simple fix for this or a step in installing the raid/lvm stuff that I've missed?
I'm doing this on Debian Etch. The system was booting fine from an lvm disk partition before. Incidentally, the volume group of the old non-raid lvm was 'root' which is interesting because that's in the first line way above where it says 'Volume group "root" not found'. I don't know where it's getting that old volume group name from, it definitely has been changed in menu.lst.