I've got a Mythbuntu setup for my parents, but it has come time for an upgrade. As I've added a new hard drive, I thought the easiest way was to simply give /var/lib more space by taking it from it's original partition to transitioning to lvm.

Because of some other repairs / updates I've done, I did a lot booted into a liveCD (SystemRescueCD latest version - Gentoo based). I got lvm working pretty easily, and it mounts with my restored backup no problem.

I didn't think that it might be a problem that these physical and logical volumes were created in the liveCD, but it seems it is. I'm trying to use this howto:
http://tldp.org/HOWTO/LVM-HOWTO/reci...gtonewsys.html
to transition the volumes to the mythbuntu system. However, after rebooting into the mythbuntu setup, pvscan never returns any physical volumes. The device nodes are there, and cfdisk correctly identifies the partitions as lvm volumes.

Is there a different procedure to follow when just moving a volume group between two different OS's on the same machine? Thanks!

If it helps, pvscan does find any physical volumes even when chrooted into the mythbuntu system (with /dev bind mounted, and proc,sysfs,tmpfs all mounted). So does that indicate a problem with the Ubuntu lvm2 package, or is there just some setup I don't know?

Thanks.

I'm having much more luck now, but I'll post to leave this advice behind.

When trying to do inter-machine or inter-OS stuff with LVM, make sure the versions match.