[root@xen download]# virt-install
What is the name of your virtual machine? test0
 How much RAM should be allocated (in megabytes)? 512
 What would you like to use as the disk (path)? 
 How large would you like the disk () to be (in gigabytes)? 10GB
 ERROR:  invalid literal for float(): 10GB
How large would you like the disk () to be (in gigabytes)? 10
 ERROR:  Must provide a file, not a directory for the disk
What would you like to use as the disk (path)? 
 How large would you like the disk () to be (in gigabytes)? 10
 ERROR:  Must provide a file, not a directory for the disk
What would you like to use as the disk (path)? /var/lib/xen/test0
 How large would you like the disk (/var/lib/xen/test0) to be (in gigabytes)? 10
 Would you like to enable graphics support? (yes or no) yes
 What is the install location? http://rhn/tree/
 

Starting install...
Retrieving Server...                                            398 kB 00:00 
ERROR:  Invalid URL location given: [Errno 14] HTTP Error 404: Not Found