Chapter 4 Load Balancing, Failover, and Component Availability

Configuring load balancing

To enable and configure load balancing from Jaguar Manager:

Select the Clusters folder.
Select the cluster that you want to configure.
Select File | Cluster Properties. The Cluster Properties window displays.
Select the Load Balancing tab. Click the Dynamic Load Balancing Enabled check box.
Complete the load balancing property sheet and click OK. Default values are provided but you may want to modify them depending on the capabilities of the servers in your cluster. Load balancing properties are described in Table 4-1.

Table 4-1: Load balancing properties
Property	Description	Comments
Sample interval	The interval, in seconds, that each server collects its load metrics.	The default value is five seconds.
Broadcast interval	The interval, in minutes, that each server broadcasts its load metrics to the other servers in the cluster.	The default value is five minutes.
Calculate interval	The interval, in minutes, that the load collectors in the name servers calculate and generate a normalized load list (NLL) of all member Jaguar servers.	The default value is ten minutes.
Refresh interval	The interval, in minutes, that the name servers obtain the NLL from its local load collector. All name servers have their own copies of the NLL. The refresh interval is equal to or greater than the calculate interval.	The default value is ten minutes.
Maximum weight	The maximum weight, used in a weighted load balancing policy, of any server.	The default maximum weight is five. The maximum value is ten.
Policy	Select the load balancing policy for this cluster from the drop-down list.	If you select a weighted policy, you must supply a weighted value for each server in the cluster.
Weights	This property is enabled if you selected a weighted policy. Supply a weighted value for each server in the cluster, not to exceed the maximum weight value.	See "Weighted policy" for more information.