|
|
|
To provide load balancing between two user directories that also failover to each other if one of the directories becomes unavailable, you must configure two failover groups. Each of the failover groups must be configured to load balance with the other group, since failover functionality is not a part of user directory load balancing.
For example, consider two user directories, A and B, that should be load balanced and also failover to each other. Where spaces imply failover and commas imply load balancing, groups should be setup as follows:
A B,B A
Note: This notation is similar to the notation used in the Server field of the User Directory dialog of the SiteMinder Admin UI, except that the letters representing the servers would be replaced by the IP addresses of the servers.
In the example, there are two failover groups: "A B" and "B A". These two groups are load balanced together. Therefore, if both directories are up, load balancing occurs between the first directories in each failover group, or A and B. If A becomes unavailable, failover occurs in the first group, and requests load balance between B and B (or always go to B) until A becomes available again.
Consider a similar example with 4 separate directories, A, B, C, and D, configured as follows:
A B,C D
In this case, requests are load balanced between A and C. If C becomes unavailable, requests are load balanced between A and D until C is once again available.
| Copyright © 2011 CA. All rights reserved. | Email CA Technologies about this topic |