User manual REDHAT NETSCAPE ENTREPRISE SERVER 6.0 ADMINISTRATOR

[. . . ] Administrator's Guide Netscape Enterprise Server Version 6. 0 November 2001 Netscape Communications Corporation ("Netscape") and its licensors retain all ownership rights to the software programs offered by Netscape (referred to herein as "Software") and related documentation. Use of the Software and related documentation is governed by the license agreement for the Software and applicable copyright law. Your right to copy this documentation is limited by copyright law. Making unauthorized copies, adaptations or compilation works is prohibited and constitutes a punishable violation of the law. [. . . ] For more information, see the Netscape Enterprise Server Performance Tuning, Sizing, and Scaling Guide. Using Quality of Service Quality of Service refers to the performance limits you set for a server instance virtual server class, or virtual server. For example, if you are an ISP, you might want to charge different amounts of money for virtual servers depending on how much bandwidth you allow them. You can limit two areas: the amount of bandwidth and the number of connections. Chapter 10 Monitoring Servers 217 Using Quality of Service You can enable these settings for the entire server or for a class of virtual servers in the Server Manager from the Monitor tab. However, you can override these server or class-level settings for an individual virtual server. For more information on setting quality of service limits for an individual server, see "Configuring Virtual Server Quality of Service Settings, " on page 329. Two settings govern how traffic is counted and how often the bandwidth is recomputed: the recompute interval and the metric interval. The recompute is how often (in milliseconds) the bandwidth is computed. The metric interval is the period of time for which data is used in traffic calculations. This section includes the following topics: · · · · Quality of Service Example Setting Up Quality of Service Required Changes to obj. conf Known Limitations to Quality of Service Quality of Service Example The following example shows how the quality of service information is collected and computed: The server has metric interval of 30 seconds. The server starts up at a time of 0 seconds. At time 1 second, an HTTP connection generates 5000 bytes of traffic to/from the server. No more connections are made after that. At 30 seconds, the total traffic for the last 30 seconds is 5000 bytes. At 32 seconds, the traffic sample from 1 second is discarded, since it is older than the 30 seconds of the metric interval. The total traffic for the last 30 seconds is now 0. The server's recompute interval is 100ms. Continuing with the example, the bandwidth gets recomputed periodically every 100 milliseconds. The calculation is based on the amount of traffic as well as the metric interval. At time 0 seconds, the bandwidth is calculated for the first time. The total traffic is zero, divided by the metric interval of 30 seconds, gives a bandwidth of zero. 218 Netscape Enterprise Server Administrator's Guide · November 2001 Using Quality of Service At 1 second, the bandwidth is calculated for the 10th time (1000 milliseconds/ 100 milliseconds). The total traffic is 5000 bytes, which is divided by 30 seconds. The bandwidth is 5000/30 = 166 bytes per second. [. . . ] A software library establishing a secure connection between two parties (client and server) used to implement HTTPS, the secure version of HTTP. top (UNIX) A program on some UNIX systems that shows the current state of system resource usage. top-level domain authority The highest category of hostname classification, usually signifying either the type of organization the domain is (for example, . com is a company, . edu is an educational institution) or the country of its origin (for example, . us is the United States, . jp is Japan, . au is Australia, . fi is Finland). uid (UNIX) A unique number associated with each user on a UNIX system. URI Uniform Resource Identifier. [. . . ]