Sun Java System Web Server 7.0 Update 7 Performance Tuning, Sizing, and Scaling Guide

Configuration

Certain tuning parameters are set at the configuration level, so that every server instance that is based on the configuration has the same tuning information. In addition, some monitoring information is available at the configuration level, so you can monitor the performance of all instances based on the configuration. However, the bulk of the monitoring information is available at the individual server instance, or virtual server level. If you are using a single Web Server instance per configuration, meaning your server is not part of a server farm, the configuration-level statistics show the information for the single server instance based on that configuration.