Thank you. Here is the steps:

> Need a Shared disk should be present in the nodes and must be a cluster resource.

http://blogs.technet.com/b/askcore/archive/2009/01/14/adding-a-new-disk-to-an-existing-windows-2008-cluster.aspx?Redirected=true

> Use “Install new SQL server failover cluster installation” from SQL setup.exe in one of the nodes where the new drive is active/ available.

> Use “Add node to the SQL server failover cluster” to add other nodes from SQL setup.exe.