DR, HA and remote journaling from a non-iSeries perspective

To satisfy requirements at our new parent company our division will be
required to upgrade our current DR process and I've been asked to research
iSeries DR and HA products.

From reading whitepapers and talking to sales reps I have a yeoman's
understanding of the current technologies - enough to provide a
management-level overview in January. What I lack, though, is knowledge of
how the current iSeries processes compare with others. These folks are all
SQL-server types and can barely spell "iSeries" so I'd like to be able to
explain things in their terminology.

Is anyone aware of literature that compares the current IBM technologies
(journal harvesting and remote journaling) with what is being done on other
platforms?

Many thanks, JK