Prepping for a GFS2 Cluster

Hi Experts,

I currently have one server connected to a SAN, with the intention of purchasing an additional server within the next year. I'd like to setup a GFS2 cluster but the current RHEL6 doesn't support single-node GFS2. What can I do to build this architecture with the least amount of pain when I add the second server and want to configure GFS2? Or will I really need to reformat all the filesystems to get them into a cluster later?

Anyone have any suggestions?

Thanks,

Jeff Turmelle
International Research Institute for Climate and Society
Earth Institute, Columbia University