Virtual servers add another layer to the performance improvement process. Certain settings are tunable for the entire server, while others are based on an individual virtual server. You can also use the quality of service (QOS) features to set resource utilization constraints for an individual virtual server or class of virtual servers. For example, you can use QOS features to limit the number of connections allowed for a virtual server or class of virtual servers.
For more information about using the quality of service features, see the Sun Java System Web Server 6.1 SP6 Administrator’s Guide.