The biasing algorithm provides a way of balancing workload by specifying that workload distribution should favor particular server groups. For example, if there are two server groups with a bias of 75 and 25, program requests are sent in a ratio of 3:1 to the first server group.
If a server group fails, the internal biasing calculation changes. If two server groups are available, one with a bias of 100 and the other with a bias of 0, all requests are sent to the first server group. If the first server group becomes unavailable, all requests are directed to the second server group. A bias value of 0 is a special case, meaning use only if no other server group is available.
The biasing algorithm works only for ECI calls. If you try to run an EPI application whilst the biasing algorithm is selected, the round-robin algorithm is used instead.