[Linux-cluster] GFS in cluster

[Srija]

 Hi,

 I have created a GFS filey system  as shared between three nodes clusters.
 The file system is being mounted in 
 the three nodes and I set the mount points in the /etc/fstab,

 Want to know how the cluster will keep the track of the GFS file system.
 How the fence/lock_dlm will work?

 Do i need to set the GFS in a service? If yes , what will be the 
 resources under the service?

 Will be really appreciated if I get some document to proceed further.

 Thanks.