I'm gonna be blunt here, so don't get offended but DO listen. HA is a CRITICAL part of a business' ability to function. If you screw it up you could lose your company, or fail to deliver healthcare to critically sick patients and have them die, or fail to produce electricity from the power plant, etc, etc. It is that simple. And to have any hope at all of getting it right you simply MUST have training, experience, knowledge that you and presumably no one else at your company has or you wouldn't be writing a forum post like you did. That means you need to bring in such assistance for this project. Over and over and over I have seen clients (and forum posters) try to do this after a few forum posts or reading a few blog posts, etc. and I have never seen it go well. But I HAVE seen companies go out of business because their HA or DR was messed up.