Couple questions as a newbie on Zimbra;

Understanding for Zimbra to cluster we need RHCS and Zimbra Network edition, are there any guides for version 8 yet; Google doesn't return anything other than versions 4 and 5 by the looks of it.

What is the latest version of RHCS that supports Zimbra clustering?

I am looking to build an active - active platform with two separate data centres with individual SAN storage accessed via a private high speed wan link, is this possible; thoughts and ideas please.