How to Mount Another LVM
Background
My wife's desktop PC became unusable recently when the power supply failed. It was an old PC and the power supply was rather unique. It was running Fedora Linux 7 with LVM2.
I thought I could simply remove the hard drive containing Fedora 7 volumes and install it into an external USB hard drive case. However, once it was set up, only the boot volume was visible, not the volume containing all the data.
Using my limited knowledge of LVM only yielded a duplicate volume name error message.
After some research, I found a solution, which I will document here for the benefit of others.
Useful Commands
List the logical volume groups:
lvcsan
List the physical volumes:
pvscan
Rename the logical volume group of the external drive from VolGroup00 to VolGroup01 (or other unique name):
vgchange -ay VolGroup01
Create a folder for use in mounting the external drive:
mkdir /mnt/external
Mount the data partition of the external drive:
mount -t ext3 /dev/VolGroup01/LogVol01 /mnt/external