(Supporting ADX v03.1.00) Owner manual

22 Brocade Virtual ADX Server Load Balancing Guide

53-1003247-01

Changing the Load-Balancing Predictor Method

Selecting the round-robin parameter configures the Round Robin load-balancing method. This

method is described in “Round Robin predictor” on page 8.

Selecting the weighted-round-robin parameter configures the Weighted Round Robin

load-balancing method. This method is described in “Weighted Round Robin predictor” on page 9.

Selecting the weighted-round-robin-static parameter configures the Static Weighted Round Robin

load-balancing method. This method is described in “Static Weighted Round Robin predictor” on

page 9.

Selecting the weighted parameter configures the Weighted load-balancing method. This method is

described in “Weighted and Enhanced Weighted load balancing” on page 10.

Selecting the enhanced-weighted parameter configures the Weighted load-balancing method. This

method is described in “Weighted and Enhanced Weighted load balancing” on page 10.

Selecting the response-time parameter configures the response time load-balancing method. This

method is described in “Server response time” on page 14. Configuring the response time load

balancing method requires that you configure a smooth factor as described in “Configuring the

smooth factor” on page 25.

Selecting the dynamic-weighted parameter configures the Dynamic Weighted load-balancing

method. This method can be configured as either direct or reverse as described in “Dynamic

weighted predictor” on page 13. Details about configuring the Dynamic Weighted load-balancing

method as direct or reverse are described in “Configuring dynamic weighted predictor” on page 24.

If you enable any of the weighted methods, you must configure the weights for all real servers

involved. The weights can range from 0 through 65000. This configuration is described in

“Configuring a weighted predictor” on page 22.

NOTE

If a given VIP port is bound to multiple ports on the same real server, then the least-connection

predictor may not produce even traffic distribution. Use the round-robin predictor instead.

For overview information, refer to “Load-balancing predictor” on page 8.

Configuring a weighted predictor

Several of the Load-Balancing Predictor Methods used on the Brocade Virtual ADX require that

weights be assigned to the real servers. The Brocade Virtual ADX uses a formula based on each

real server’s assigned weight to calculate the server load for the real servers, then selects the real

server as determined by the predictor that is configured on the Brocade Virtual ADX.

To configure a Load-Balancing Predictor Method, perform the following tasks.

1. Assign weights to the real servers.

2. Configure the weighted predictor either globally or for a virtual server.

NOTE

If a real server port is bound under a VIP but a weight is not configured under the real server, the

Brocade Virtual ADX will assume the weight for that real server is 1.