You can download or order the installation media at http://www.oracle.com/technetwork/server-storage/solaris11/downloads/index.html.
If the server is equipped with an optional DVD drive, insert the Oracle Solaris OS installation DVD into the DVD drive located on the front of the server.
If your server does not have a DVD drive, insert an external USB DVD drive or a USB flash drive that contains the Oracle Solaris OS installation media into one of the external USB ports located on the front and rear of the server.
For information about the location of the server's external USB ports, refer to Server Features and Components in Oracle Server X6-2 Installation Guide.