What are the main differences (other then UI) between RH/CentOS cluster and heartbeat?
I have some experience using heartbeat, but wondered what the RH/CentOS provides, and looking at docs it seems more or less the same, plus shared storage support (which can be done on heartbeat via GFS).
if using centos5 and setting up Redhat Cluster with GFS.... just, don't. either use what @devicenull suggested (centos6, etc.) or stick with heartbeat/pacemaker specifically. RH cluster on centos5 is fundamentally broken due to some locking issues with the kernel that nobody really seems to have figured out.