GlusterFS, A great DS System, but it is not just ok until now, 20130402

# Add a new harddisk to the machine

mkdir -p /export/brick1
fdisk /dev/sdb
mkfs.xfs -i size=512 /dev/sdb
echo "/dev/sdb /export/brick1 xfs defaults 1 2" >> /etc/fstab
mount -a && mount

# Install GlusterFS

wget -P /etc/yum.repos.d http://download.gluster.org/pub/gluster/glusterfs/LATEST/EPEL.repo/glusterfs-epel.repo
yum install -y glusterfs{-fuse,-server}
service glusterd start

# Configure

gluster peer probe 192.168.50.21
gluster volume create gv0 replica 2 192.168.50.21:/export/brick1 192.168.50.25:/export/brick1
gluster volume start gv0

# Client mount

mount -t glusterfs node01.yourdomain.net:/gv0 /mnt
for i in `seq -w 1 100`; do cp -rp /var/log/messages* /mnt/copy-test-$i; done