Dell 3-DNS, Administrator'S Manual

Page: 126 / 165

Chapter 8
8 - 6
Using the Dynamic Ratio option
When the Dynamic Ratio option is turned on, the 3-DNS Controller treats
QOS scores as ratios, and it uses each server in proportion to the ratio
determined by the QOS calculation. When the Dynamic Ratio option is
turned off (the default), the 3-DNS Controller uses only the server with the
highest QOS score for load balancing, (in which case it is a winner-takes-all
situation) until the metrics information is refreshed.
To turn on the Dynamic Ratio option using the Configuration
utility
1. In the navigation pane, click Wide IPs .
2. In the Wide IP column, click a wide IP name.
The Modify Wide IP screen opens.
3. On the toolbar, click Modify Pool .
The Modify Wide IP Pools screen opens.
4. In the Pool Name column, click the name of a pool.
The Modify Load Balancing screen opens.
5. Check Use Dynamic Ratio .
6. Click Update .
To turn on the Dynamic Ratio option from the command line
1. To ensure that the configuration files contain the same information
as the memory cache, type the following command:
3ndc dumpdb
2. Open the wideip.conf file in a text editor (either vi or pico ).
3. Locate the wideip statement and the pool definition you want to
edit.
4. Add the syntax (shown in bold in Figure 8.4) to the pool definition.
5. Save and close the file.