Redundant Accounting

Hi everyone, I have set up a FreeRadius2 v2.1.8 installation a while back and configured it according to our needs. It is running smoothly, currently doing Auth and Acc on one box with a MySQL database and a detail file being used. We now want to set up a second box which basically shall do the exact same thing as the first does as a failover and also give us two identical accounting tables in the databases. Can you guys point me in the right direction for this - google just doesn't seem to like me on this one. Thanks so much Marius