Could someone list or point me in the right direction ways of setting Zimbra up in a High Availability Cluster. What I mean exactly is that I want to have N+1 redundancy across my whole Zimbra installation. If 1 particular server goes down, I don't want to lose any access to the service whatsoever for customers. The only way (if I am reading correctly) is to use Redhat clustering feature... is this correct?
Surely having a product which is in direct competition with Microsoft Exchange has such a feature or at the very least is on its roadmap moving forward?