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Sun ONE Web Server 6.1 Administrator's Guide

> ## The Monitor Tab

> The Monitor Tab allows you to monitor your server’s activity, using built-in monitoring functions and SNMP. The Monitor Tab contains the following pages:

> - The Monitor Current Activity Page
> - The Quality of Service Page (Server Manager)
> - The SNMP Subagent Configuration Page
> - The SNMP Subagent Control Page (UNIX/Linux)

> ##

> The Monitor Current Activity Page

> If your server is running, the Monitor Current Activity page allows you to enable statistics profiling and launch a program to monitor your server’s current resource usage in a number of categories. This program will give you a feel for how many resources your server needs. If your server becomes sluggish at higher traffic levels, this will help you determine if you need to adjust your server configuration, or adjust the system’s network kernel.

> Warning | When you enable statistics/profiling, statistics information is made available to any user of your server.

> For more information on using the output of this system to tune your server, see the online Performance Tuning and Sizing Guide at http://docs.sun.com.

> Activate Statistics/Profiling. To see the statistics for your server, you must first enable statistics/profiling. This function is turned off by default because it uses system resources. Once you turn statistics/profiling on, you must restart your server to apply the changes.

> OK. Displays a page showing the statistics you’ve requested. The statistics are updated every n seconds, where n is the poll interval you selected.

> Reset. Erases your changes and resets the elements in the page to the values they contained before your changes.

> Help. Displays online help.

> Select Refresh Interval. The interval, in seconds, to display updated statistics on your browser.

> Select Statistics to be Displayed. The type of statistics displayed: Connections, DNS, KeepAlive, Cache, or Virtual Server.

> Submit. Once you click this button, the selected statistics are displayed.

> You can choose to have them displayed by process ID or by all process IDs. They are updated on your screen every few seconds, depending upon the number you chose for the refresh interval. Some statistics pages display bar graphs showing the data.

> ##

> The Quality of Service Page (Server Manager)

> Quality of Service refers to the performance limits you set for a server instance virtual server class, or virtual server.You can limit two areas: the amount of bandwidth and the number of connections.

> For more information, see Using Quality of Service.

> The following elements are displayed:

> Enable QOS. Enables quality of service features for the entire server instance. By default quality of service is disabled. Enabling quality of service increases server overhead slightly.

> Set Default. Check this to apply the default values for the QOS Recompute Interval (300ms) and the QOS Metric Interval parameters (30s).

> QOS Recompute Interval. The period in milliseconds in which the bandwidth gets recomputed for all server entities. The default is 100 ms.

> QOS Metric Interval. The interval in seconds during which the traffic is measured. The default is 30. All bandwidth measured during this time is averaged to give the bytes per second.

> If your site has a lot of large file transfers, use a large value (several minutes or more) or this field. A large file transfer might take up all the allowed bandwidth for a short metric interval, and result in connections being denied if you’ve enforced the maximum bandwidth setting. Since the bandwidth is averaged by the metric interval, a longer interval smooths out spikes caused by large files.

> If the bandwidth limit is much lower than available bandwidth (for example, 1 MB-per-second bandwidth limit but with a 1 GB-per-second connection to the backbone), the metric interval should be shortened.

> Please note that if you have large static file transfers and a bandwidth limit that is much lower than available bandwidth, you have to decide which situation to tune for, since the problems require opposite solutions.

> Action. Enables or disables quality of service features for the class listed in the Apply to column.

> Bytes per second. The maximum bandwidth limit for the server or class in bytes per second.

> Enforce B/W. Specifies whether the bandwidth limit should be enforced. If the limit is enforced the server refuses connections after reaching the limit.

> Max Connection. The maximum number of concurrent connections for the server or class.

> Enforce Cnxs. Specifies whether the connection limit should be enforced. If the limit is enforced the server refuses connections after reaching the limit.

> OK. Saves your changes.

> Reset. Erases your changes and resets the elements in the page to the values they contained before your changes.

> Help. Displays online help.

> ##

> The SNMP Subagent Configuration Page

> Simple Network Management Protocol (SNMP) is a protocol used to exchange data about network activity. With SNMP, data travels between a managed device and a network management station (NMS) where administrators remotely monitor and manage the network. The SNMP Configuration page allows you to configure SNMP to monitor your server.

> For more information, see Monitoring Servers.

> The following elements are displayed:

> Master Host. Specifies the name and domain of the server.

> Description. Specifies the description of the server (including operating system information).

> Organization. Specifies the organization responsible for the server.

> Location. Specifies the absolute path for the server.

> Contact. Specifies the person responsible for the server and the person’s contact information.

> Enable SNMP Statistics Collection. Specifies whether the SNMP statistics collection is enabled.

> OK. Saves your entries.

> Reset. Erases your changes and resets the elements in the page to the values they contained before your changes.

> Help. Displays online help.

> ##

> The SNMP Subagent Control Page (UNIX/Linux)

> Every managed device contains an SNMP agent that gathers information regarding the network activity of the device. This agent is known as the subagent. Each server instance has a subagent. All subagents can communicate with the master agent. The SNMP Subagent Control page allows you to configure SNMP to monitor your UNIX/Linux server.

> Caution | You must enable the subagent for your server instance before you attempt to start it.

> For more information, see Enabling the Subagent.

> The following elements are displayed:

> Start. Start the SNMP subagent for this server instance.

> Stop. Stops the SNMP subagent for this server instance.

> Restart. Stops and then starts the SNMP subagent for this server instance.

> Help. Displays online help.

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> Copyright 2004 Sun Microsystems, Inc. All rights reserved.