Quality of service refers to the performance limits you set for a virtual server. For example, an ISP might want to charge different amounts of money for virtual servers depending on how much bandwidth allowed them.
You can enable these settings for the entire server or for a class of virtual servers in the Server Manager, from the Status tab. However, you can override these server or class-level settings for an individual virtual server.
Before enabling quality of service for a virtual server, you must first enable it for the entire server, and also set some basic values. See Using Quality of Service.
To configure the quality of service settings for a virtual server, follow these steps
From the Class Manager, click the Virtual Servers tab.
Click Quality of Service.
A page appears listing all the virtual servers in the class and their quality of service settings.
To enable quality of service for a virtual server, choose Enable from the drop-down list.
By default quality of service is disabled. Enabling quality of service increases server overhead slightly.
Set the maximum bandwidth, in bytes per second, for the virtual server.
Choose whether or not to enforce the maximum bandwidth setting.
If you choose to enforce the maximum bandwidth, connections are refused, once the server reaches its bandwidth limit additional.
If you do not enforce the maximum bandwidth, when the maximum is exceeded the server logs a message to the error log.
Choose the maximum number of connections allowed for the virtual server.
This number is the number of concurrent requests processed.
Choose whether to enforce the maximum connections setting.
If you choose to enforce the maximum connections, additional connections are refused, once the server reaches its limit .
If you do not enforce the maximum connections, when the maximum is exceeded the server logs a message to the error log.
For more information on the quality of service features, see Using Quality of Service.