From a purely DR perspective, your DR site does not have to be the same as production. Not everyone has the luxury of having the same level of performance at a DR site as the production site.

Exchange will "work" on slower speed high capacity disks. It just will not operate at the same level of performance as the production site. But that is obvious and I am sure you already understand that.

I think though that using slower devices and fewer spindles on the remote site may slow down the replication a little bit but that may be acceptable for your DR plan.

Personally for local clones and DR clones at our remote site we always use higher capacity, slower speed disks. It is an economical necessity.

Question for you though, what is the replication transport? MirrorView? Are the disks 320GB ATA (there were no 300GB ATA) or 300GB FC?

AranH you are correct. Our clone disks are 320GB ATA disks, not 300. Also, we would be using mirrorview as the transport.
Thanks for the resopnse. I was hoping for someone to say it's okay to use ATA for clones. I can see no reason why not.