Here is a basic howto for installing
GlusterFS onto either a Debian Lenny or RHEL 5.4 install.
I originally had some issues with getting FUSE kernel mod to load properly under RHEL but found building the tar.gz from the gluster ftp worked.
For RHEL
rpm -ivh http://ftp.gluster.com/pub/gluster/glusterfs/3.0/3.0.4/RHEL/glusterfs-3.0.4-1.src.rpm
yum -y install libibverbs-devel flex bison
rpmbuild -ta glusterfs-3.0.4.tar.gz
rpm -ivh glusterfs*
wget http://ftp.zresearch.com/pub/gluster/glusterfs/fuse/fuse-2.7.4glfs11.tar.gz
rpmbuild -ta fuse-2.7.4glfs11.tar.gz
rpm -Uvh /usr/src/redhat/RPMS/i386/kernel-module-fuse*
rpm -Uvh /usr/src/redhat/RPMS/i386/fuse-*
rmmod fuse
depmod -a
modprobe fuse