I setup a Gentoo system on a ADM64X2 with software raid and lvm. The setup
process of the base system went fine. After the first reboot my volume
groups are not recognized, most likely I made a mistake when building the
kernel. Now I tried to reboot from the installation CD and wanted to mount
the volumes again to correct the kernel. However, all tools I know of dont
work:
vgscan --mknodes
pvscan -v
tell me: No matching physical volumes found
What is the correct way to recover, beside reinstallation?
Chris

Chris Imker wrote:

> I setup a Gentoo system on a ADM64X2 with software raid and lvm. The setup
> process of the base system went fine. After the first reboot my volume
> groups are not recognized, most likely I made a mistake when building the
> kernel. Now I tried to reboot from the installation CD and wanted to mount
> the volumes again to correct the kernel. However, all tools I know of dont
> work:
> vgscan --mknodes
> pvscan -v
> tell me: No matching physical volumes found
> What is the correct way to recover, beside reinstallation?
> Chris

You should use...

vgchange -ay

.... instead. Normally this should be done at boot time and most
distributions will do this automatically, even if you don't have any
logical volumes. However, I don't know Gentoo well enough yet to know
whether this will be done automatically at boot by the Gentoo /init/
scripts - I'm still in the /chroot/ phase myself, considering that I don't
always have the time to work on that machine and that my intended set-up is
pretty much complex. ;-)

The installation CD - I presume you're using the Live CD? - contains the LVM
tools, but that doesn't mean that they are installed on your system yet.
You may need to emerge them first.

--
Aragorn
(registered GNU/Linux user #223157)