Clarification needed on GFS and shared file system

view full story

http://serverfault.com – Need clarification regarding selecting a shared file system for our servers . The shared space is from SAN and the servers will write to the shared file system at the same time. One option for me is to select GFS , but I think that requires creating a cluster first and since it will be a HA cluster , I think only one server will be able to write to shared file system at the same time . My confusion here is that if I just run the cluster services without creating a cluster will I be able to configure and run GFS. Also, if I use GFS , can I write to the GFS file system from two servers at the (HowTos)