There are just a few simple steps to transition this setup, but it is still recommended that you backup your data before you try it. You have been warned.
Build LVM kernel and modules
Build the LVM user tools
Follow the steps in Chapter 9 to build and install the user tools for LVM.
Setup your init scripts
Make sure you have the proper init scripts setup as per Chapter 7.
Boot into the new kernel
Make sure your boot-loader is setup to load the new LVM-enhanced kernel and, if you are using LVM modules, put an insmod lvm-mod into your startup script OR extend /etc/modules.conf (formerly /etc/conf.modules) by adding
alias block-major-58 lvm-mod alias char-major-109 lvm-mod
Reboot and enjoy.