HA-LVM vs CLVM

[urgrue]

Hello,
I need to set up a simple failover scenario. The idea is to have two
independent RHEL 5 systems on local disks, connected to a shared SAN.
The application is all on the SAN. Only one node is ever running at a
time. If the active node fails, the disk needs to be mounted on the
passive node and the application started.
Failover doesn't have to be fast or automatic, but it has to be simple
and reliable.
Depending on where I look, HA-LVM is sometimes recommended and other
times it's CLVM. Looking at red hat cluster it seems HA-LVM is a bit
overkill for my needs.
Any suggestions or other options?