Choose what type of installation you would like to perform. Your options (Advanced Server and Custom) are discussed briefly below.
An Advanced Server installation is specifically targeted at server installations capable of high levels of availability through load balancing and failover capacities. The Advanced Server configuration includes, at your option, the ability to install a default X Window System environment with management, as well as the necessary components for clustering together two or more systems to achieve higher levels of performance to meet the demands of high performance server environments.
Choosing the Custom installation gives you complete flexibility. You have complete control over the packages that will be installed on your system. You can also determine whether you will use GRUB to boot your system. Unless you have prior Linux experience, you should not select the Custom installation method.