In iPlanet Web Server 4.1, you could create multiple server instances using hardware and software virtual servers, but these instances were required to share the same configuration information. With Sun Java System Web Server 6.1, you can set up multiple classes of virtual servers. Each class has separate configuration information.
The settings for virtual servers are stored in the server.xml file, found in the server_root/server_ID/config directory. See the Sun Java System Web Server 6.1 SP10 Administrator’s Guide for more information on virtual servers.