@vinay poreddy I can't address specific configuration of load balancer configuration, but I can give you some hints on how to configure your web servers (nodes 1 and 2 in your example).
You will want to configure your public and private files directories to be shared between the web servers, either using GlusterFS (generally the preferred solution) or NFS, or perhaps some other network filesystem. You can determine/configure which directories are public/private by visiting Configuration ⇒ Media ⇒ File system in your Drupal install (logged in as an administrator). By default these would be sites/default/files and sites/default/private, respectively. These need to be shared so that assets uploaded by users or generated on-the-fly by PHP are available on either node.
In settings.php on each web server you should configure Drupal to point to the single MySQL instance.
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