Assuming main physical disk: /dev/sda
Second physical disk: /dev/sdb
- Run pvscan to list the physical volumes found in any block device of the system. Among error lines this returned PV lines for /dev/sda2 and /dev/sdb2. On the same line was the name of the volume group, in my case 'sysvg'
- Made the 'sysvg' volume group active by typing lvchange -ay sysvg. This created a new entry in the /dev/sysvg
- Doing an ls /dev/sysvg showed the different volumes under that volume group, from there simply had to do: mount /dev/sysvg/root.vol /mnt
- When done: umount /mnt && lvchange -an sysvg