The biasing algorithm provides a way of balancing workload by specifying that workload distribution should favor particular regions. For example, if there are two regions with a bias of 75 and 25, program requests are sent in a ratio of 3:1 to the first region.
If a region fails, the internal biasing calculation changes. If two regions are available, one with a bias of 100 and the other with a bias of 0, all requests are sent to the first region. If the first region becomes unavailable, all requests are directed to the second region. A bias value of 0 is a special case, meaning use only if no other region 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.