High availibility setup with nfs

High availibility setup with nfs

Web Hosting HA setup
I have 5 servers
Server-1 : Webhosting Controlpanel (192.168.1.1)
Server-2 : Load balancer [Haproxy] (Public IP:192.168.1.2 and Virtual IP:192.168.1.3)
Server-3 and 4 : Data Servers Mounted data from NFS so data is same on each server i.e /home (192.168.1.4, 192.168.1.5)
Server-5 : Nfs Server (192.168.1.6) shared directory /home
My Problem is I am not able to mount /home from virtual ip of load-balancer I dont know how to configure HAproxy to access shared folders from servers
I can access the mounted directories /home from servers directly but i want to mount the /home by load balancer so that I have some HA setup.
NOTE
Load balancer is working for apache i can see the apache default page loading from virtual ip of loadbalancer
here is model image of setup
http://i.stack.imgur.com/BUQex.png