Can you raid1 an i-ram drive and an ssd??
How about an I-ram drive and a spindle drive??
In a mirrored array, does the fastest drive run as slow as the slowest drive?
My thinking is that an I-Ram drive for o/s and programs would be extremely fast, but pretty annoying in the event of a bsod or power outage .... so if there's a way to mirror it to something more reliable like an ssd or spindle drive, that'd be great