I tried doing a clean install like I always do when a new update came out but this is my first Fusion drive. I formatted the drive and proceeded to install 10.11 but installation won't let me. The Fusion drive now shows only 600MB or something. I can only run OS X off a USB drive now. Do I need to visit Apple to have them re-clone my drive or can I use Carbon Copy Cloner to clone the USB install and throw it on the Fusion? Really wished I didn't do that. Doh!