Archlinux fails to find lvm volumes after installation

Lazer · 2007-10-18 09:24:59

Hi,
yesterday i installed archlinux on a logical volume, root and boot are both on this volume (/dev/mapper/volg-arch).
the filesystem is ext3. the setup recognized the volume group and activated all volumes, so the installation was no problem, but when i try to start the system after installation, no volume group can be found.
lvm2 was enabled during installation using USELVM="yes" in rc.conf and HOOKS="base udev autodetect pata scsi sata keymap lvm2 filesystems" in mkinitcpio.conf.
i use grub2 to boot the system with the following entry

menuentry "Arch" {
linux (volg-arch)/boot/vmlinuz26 root=/dev/mapper/volg-arch
initrd (volg-arch)/boot/kernel26.img
}

it boots, however it cannot find any volume groups and because of that cannot load the root-filesystem.
my other linux-system works great, which is installed on lvm2 and using grub2, too.

did i miss a configuration?

nogoma · 2007-10-18 12:11:44

On my machine, I have the root= in my grub entry like so:

root=/dev/vg_sys/root

i.e. I'm not going through the mapper device, but through the actual device node

Lazer · 2007-10-18 12:50:35

thx, but neither /dev/mapper/volg-arch nor /dev/volg/arch exist, because their volume-group is not recognized.
during the archlinux-setup the volume-group was recognized, but after installation it isn't. i've tried the fallback initrd, but the problem remains.

nogoma · 2007-10-18 14:04:34

Hmm... I just realized you have boot on lvm; does grub2 support booting from lvm? I run a regular ol' separate boot partition and regular grub, so I don't know. Unless it does, I'd say that'd be a problem. If it does support booting from lvm, then the only other question I can think of is did you rerun mkinitcpio after modifying mkinitcpio.conf?

Edit: Ok, nm, I see from a quick gg that grub2 should support boot-on-lvm (which is neat...)

Last edited by nogoma (2007-10-18 14:06:09)

Lazer · 2007-10-18 15:28:59

yes, grub2 supports it., which is really great.
mkinitcpio was run after modifying mkinitcpio.conf automatically by the setup.
its really odd that it works during the setup but not later.

:: Running Hook [lvm2]
Scanning  logical volumes...
  Reading all physical volumes. This may take a while...
  No volume groups found. 
Activating logical volumes...
  No volume groups found
:: Running Hook [filesystems]

then it fails with errors (because of course no root-device could be found) and the ramfs-shell is started.
i think lvm-support is enabled,
because it is scanning for volumes.

edit:
just tried to boot with the following entry
menuentry "ArchInstall" {
linux (volg-arch-install)/isolinux/vmlinuz root=/dev/mapper/volg-arch
initrd (volg-arch-install)/isolinux/initrd.img
}
this is the volume where i copied the install-cd to (i have no cd-drive and did a hdd-install) and installed the system from.
IT WORKS! but of course it takes too long to load this setup-initrd for using the system.

so my initrd, generated by the setup, is wrong :-/
any hints?

Last edited by Lazer (2007-10-18 16:08:47)

Lazer · 2007-10-21 15:45:25

well, still not working. i need a working initrd. does anyone use archlinux on a thinkpad x30 and on lvm?
maybe my initrd cannot detect my harddisk, cause its too old.

kozaki · 2007-12-01 23:44:46

hum, have exactly the same issue than Lazer with latest Arch64 ISO (Oct 3 2007) updated at install (kernel-2.6.23)
did try to boot with '/dev/mapper/system3', /dev/mapper/systems-system3' (usual w/ other distros) but no luck so far.

Next would be to test what msoltyspl did on this post http://bbs.archlinux.org/viewtopic.php?id=39167, but tonight is too late

Arch Linux

#1 2007-10-18 09:24:59

Archlinux fails to find lvm volumes after installation

#2 2007-10-18 12:11:44

Re: Archlinux fails to find lvm volumes after installation

#3 2007-10-18 12:50:35

Re: Archlinux fails to find lvm volumes after installation

#4 2007-10-18 14:04:34

Re: Archlinux fails to find lvm volumes after installation

#5 2007-10-18 15:28:59

Re: Archlinux fails to find lvm volumes after installation

#6 2007-10-21 15:45:25

Re: Archlinux fails to find lvm volumes after installation

#7 2007-12-01 23:44:46

Re: Archlinux fails to find lvm volumes after installation

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