With Informix 11.70.FC5, you can design, deploy and use Informix Warehouse Acceleraor (IWA) from any of the Informix high availability server types -- Primary, HDR Secondary, SDS, RSS. It's simple to configure and use. The slide show below quickly gets you up to speed. Of course, Info center has further information -- http://ibm.co/LiGAQ5
fyi: You can download the powerpoint slides from the slideshare site.