Upon further reading it seems that NFS is actually the easiest to setup on Debian, a tutorial can be found here:
http://www.howtoforge.com/nfs-server...nt-debian-etch
However, which access restrictions should be imposed in exports?
# /etc/exports: the access control list for filesystems which may be exported
/storage 192.168.0.101(rw,sync)
or
/storage rw,sync
or should the restrictions include all the IPs in the cluster?