[arch-general] Can't boot from /usr on LVM

[Jesse Young]

On Mon, Jun 02, 2008 at 18:14:22 +0000, Michael Schmarck wrote:
> Hello.
> 
> Last week, I installed Archlinux-i686-2007.08-2.ftp.iso on my system. 
> I'd like to have / on /dev/sda3 (PATA) and /usr on /dev/sys/ArchUSR.
> "sys" is a LVM2 Volume Group, which I also use in my Gentoo Linux 
> installation on the same system.
> 
> I've read some installation guides on the Arch Wiki and changed 
> USELVM=YES in /etc/rc.conf and have this in mkinitcpio.conf:
> 
> HOOKS="base udev keymap autodetect pata lvm2 filesystems"

Not that it could hurt with it included (with the exception of bloating
your initcpio), but you don't need the lvm2 hook unless your root
partition is found on LVM.

> After changing that line, I re-ran mkinitcpio and a new img was
> created; this image is loaded through grub; menu.lst has:
> 
> title Arch
> kernel (hd0,2)/boot/vmlinuz26 root=/dev/sda3
> initrd (hd0,2)/boot/kernel26.img
> 
> In /etc/fstab of the Arch installation, I've got:
> 
> /dev/sda5		swap		swap		defaults
> proc			/proc		proc		defaults
> usbfs			/proc/bus/usb	usbfs		defaults
> sysfs			/sys		sysfs		defaults
> udev			/dev		tmpfs		defaults,size=8m
> devpts			/dev/pts	devpts		defaults
> devshm			/dev/shm	tmpfs		nodev,nosuid,noexec
> temp			/tmp		tmpfs		defaults
> /dev/sda3		/		ext3		noatime		0 2
> /dev/mapper/sys-ArchArch /Arch		ext3		noatime		0 2
> /dev/sys/ArchUSR	/usr		ext3		noatime		0 2

I think the problem might be that you are trying to mount /dev from
fstab. The initscripts take care of /proc, /proc/bus/usb, /sys,
and /dev before any fscking goes on.

> When I boot the system, I see that the "sys" VG gets activated and
> fsck.ext3 is run for /dev/sys/ArchArch and /dev/sys/ArchUSR (messages
> to the effect that such-and-such fragmentation exists shows and before
> that, something like LVM [done]). BUT: I can't boot. Booting stops with:
> 
> mount: special device /dev/mapper/sys-ArchArch does not exist
> mount: special device /dev/sys/ArchUSR does not exist

When fsck is done it does a mount -a, and your /dev is mounted over with
a clean tmpfs, making your lvm volumes appear to vanish.

> This shows, that both "paths" are not accessible; neither the /dev/sys/*
> stuff (which on a Gentoo Linux installation contains symlinks to /dev/mapper),
> nor the "proper" /dev/mapper path can be accessed.
> 
> Any ideas about why that happens, and, more importantly, how to fix
> that?
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 197 bytes
Desc: Digital signature
URL: <http://archlinux.org/pipermail/arch-general/attachments/20080602/16a50ae3/attachment.pgp>