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Manual Chapter: Additional Monitor Considerations
Manual Chapter
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You can configure Dynamic Ratio load balancing for pools that consist of RealNetworks® RealServer servers, Windows® servers equipped with Windows Management Instrumentation (WMI), or any server equipped with an SNMP agent such as the UC Davis SNMP agent or Windows® 2000 Server SNMP agent.
To implement Dynamic Ratio load balancing for these types of servers, the BIG-IP® Link Controller system provides a special monitor plug-in file and a health or performance monitor for several types of servers. The exception is a server equipped with an SNMP agent. In this case, the BIG-IP system provides the monitor only; no special plug-in file is required for a server running an SNMP agent.
You must install the monitor plug-in on each server to be monitored, and you must create a performance monitor that resides on the BIG-IP system. Once you have created a monitor, the monitor communicates directly with the server plug-in. For each server type, Table A.1 shows the required monitor plug-in and the corresponding performance monitor types.

UC Davis SNMP agent
SNMP DCA and SNMP DCA Base

SNMP DCA and SNMP DCA Base
For RealSystem Server systems, the BIG-IP system provides a monitor plug-in that gathers the necessary metrics when you have installed the plug-in on the RealSystem Server system. Configuring a RealSystem Server for Dynamic Ratio load balancing consists of four tasks:
1.
Download the monitor plug-in F5RealServerPlugin.dll from the BIG-IP system.
The plug-in is located in the folder /usr/local/www/docs/agents.
2.
Copy F5RealServerPlugin.dll to the RealServer plug-ins directory.
(For example, C:\Program Files\RealServer\plug-ins.)
1.
Using the .iso image, burn a CD-ROM of the BIG-IP system software.
2.
3.
Copy the file F5RealMon.src.tar.gz to the directory /var/tmp on the BIG-IP system.
5.
Use the UNIX tar command to uncompress the file F5RealMon.src.tar.gz:
6.
Change to the F5RealMon.src directory:
7.
Type the ls command to view the directory contents.
Once the plug-in is installed and compiled, you must configure a Real Server monitor, associate the configured monitor with the pool member (a RealSystem Server server), and set the load balancing method to Dynamic Ratio:
For Windows running Windows Management Instrumentation (WMI), the BIG-IP system provides a Data Gathering Agent F5Isapi.dll for the server. Configuring a Windows platform for Dynamic Ratio load balancing consists of four tasks:
Installing the Data Gathering Agent F5Isapi.dll on the server
The procedure for installing the Data Gathering Agent on a server differs according to whether the server is running IIS version 5.0 or IIS version 6.0.
1.
Download the Data Gathering Agent (F5Isapi.dll) from the BIG-IP system.
You can find this plug-in in either the /var/windlls or the /usr/local/www/docs/agents directory on the BIG-IP system.
2.
Copy f5isapi.dll to the directory C:\Inetpub\scripts.
4.
In the left pane of the Internet Services Manager, open the folder <machine_name>\Default Web Site\Script, where <machine_name> is the name of the server you are configuring. The contents of Scripts folder opens in the right pane.
5.
In the right pane, right click F5Isapi.dll, and select Properties.
The Properties dialog box for F5Isapi.dll opens.
6.
Deselect Logvisits.
(Logging of each visit to the agent quickly fills up the log files.)
7.
Click the File Security tab.
The File Security options appears.
8.
In the Anonymous access and authentication control group box, click Edit.
The Authentication Methods dialog box opens.
10.
In the Authentication methods dialog box, click OK to accept the changes.
11.
In the Properties dialog box, click Apply.
The WMI Data Gathering Agent is now ready to be used.
1.
Create a scripts directory under the web site document root (C:\InetPub\wwwroot for Default Website).
2.
Set the properties of the scripts directory to scripts and executables.
3.
Copy the file f5isapi.dll to the created scripts directory.
4.
Start IIS manager (inetmgr) and navigate to the scripts directory.
6.
Select Properties->File Security->Authentication and Access Control and ensure that the settings anonymous user and Basic Authentication are checked.
7.
If you want to allow all unknown extensions, then in IIS Manager, navigate to Web Server Extensions -> All Unknown ISAPI extensions and allow all unknown extensions. Otherwise, proceed to step 8.
8.
If you want to allow the file f5isapi.dll only, navigate to Web Server Extensions -> Tasks: Add a New Webserver Extension. Then:
a)
In the Name field, select F5 ISAPI and click Add for the required files.
This requests a path to the file.
b)
Browse to the file f5isapi.dll, using the path C:\InetPub\wwwroot\scripts\f5isapi.dll for Default Website, and click OK.
c)
Check the Set Extension Status to Allowed box, and click OK.
The value F5 ISAPI should now appear in the extensions list as Allowed.
Once you have installed the plug-in, you must configure a WMI monitor, associate the configured monitor with the pool member, and set the load balancing to Dynamic Ratio:
The BIG-IP system includes an SNMP data collecting agent that can query remote SNMP agents of various types, including the UC Davis agent and the Windows 2000 Server agent.
The BIG-IP system provides two monitor types that you can use to create a performance monitor for a server that uses an SNMP agent. These two monitor types are:
SNMP DCA
Use this monitor when you want to use default values or specify new values for CPU, memory, and disk metrics. When using this template, you can also specify values for other types of metrics that you wish to gather.
SBMP DCA Base
Use this monitor when you want to use default values or specify values for metrics other than CPU, memory, and disk usage. When using this monitor, values for CPU, memory, and disk metrics are omitted.
Configuring a server to use its SNMP agent for Dynamic Ratio load balancing consists of three tasks: configuring an SNMP DCA or SNMP DCA Base monitor, associating the monitor with the applicable pool member, and setting the load balancing method on the pool to the Dynamic Ratio method. For more information, see the following chapters or sections of this guide:
Before you can use an MSSQL type of monitor, you must download a set of JDBC JavaTM Archive (JAR) files from the Microsoft web site and install them on the BIG-IP system.
1.
2.
3.
Select SQL Server.
4.
In the Keyword field, type JDBC Driver.
5.
Click Go.
This displays a list of options.
6.
Click Microsoft SQL Server 2000 Driver for JDBC.
7.
Verify that you are downloading the UNIX .tar file, and not a Windows package. If not, go back to the previous screen.
9.
When queried, select Save the file to disk.
10.
Create a Linux directory, move the .tar file to that directory, and uncompress the file, using this command:
This command extracts four files: EULA.txt, install.ksh, msjdbc.tar, and read.me.
11.
Install these files by typing install.ksh at the command line prompt.
This untars the msjdbc.tar file, which creates several subdirectories.
12.
Locate the lib subdirectory.
This directory contains three JAR files.
13.
Copy the three JAR files to the BIG-IP system directory /usr/bin/monitors/builtins/.
You can now recursively remove the LINUX directory that you created in step 10.
Rebooting the system or running this command causes the BIG-IP system to recognize the newly-installed JAR files the next time that you run an MSSQL monitor.
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