When I tried to do this with Yosemite, I managed to create a RAID array from two 500 GB disks, but could not choose the resulting volume (after formatting, obviously) as installation medium. The internets mentioned something along the lines that OS X can no longer start up from RAID volumes. My question is, is that at all possible with El Capitan? Can I make a striped RAID-0 array and make OS X start up from that? There are reasons I want that and not CoreStorage. I don't also want to discuss startup times and the alleged 170 MB/sec speed cap. As I stated, I have reasons to have setup just like that. Is that possible? If someone did it, how?