Mimix is a HA software for the iSeries, here is their link:
It is for High Availablity and Disaster Recovery. Basically it uses local or remote journaling to replicate data from typically your Prod iSeries to another iSeries in “real time”. If running correctly, you can backup the non production iSeries therefore removing the downtime from the production box. Also if your production box were to crash, you can switch your users to the other iSeries.