Originally Posted by Weaselboy
It won't matter. The OS sees a Fusion drive as one, large drive.
Just to clarify though, you don't want to "restore" from Time Machine to get your data on the new machine. What you should do is run Migration Assistant during the system setup process and point the Migration Assistant to your Time Machine backup disk when prompted. That will bring in your user account(s) and all your data and apps.
I seem to recall the first time I fired up my 21.5 mac I was given the option to move over my time machine files, I presume that would be the migration assistant?
My concern with the fusion drive is the software side of things, if I'm migrating from an older mac which hasn't had this functionality will the fusion drive still work as it should, eg moving frequently used apps to he fusion drive etc?