Is there any disk requirement for using MirrorView ?

Hi,

We are using CX4 Storage Array and consider using MirrorView for SAN Replication.

When we use MirrorView, do we need to use the same type of disk at both sites ?  Like: Both are FC or can we use FC at the Primary Site and SATA at Remote Site ?  Do they need to be the same size (like: 600GB at both sites) ?

If we need the same type of disk (Like FC), do they need to be the same speed (Like: Both are 15krpm) ?

Thanks