If you use mdraid (Linux’ software RAID) and you want to install Fedora 16 with /boot, / and swap each in a RAID1 setup your box may not boot once the installation is finished. First go read bugzilla bug 750794 to understand what seems to be happening and why your box with shiny new Fedora 16 may not boot. Here is what I had to do to fix this problem. When you see the “Congratulations…” message at the end of the installation do not reboot. Instead go to the console (alt-f2) and do the following:
1. add the RAID modules to the grub2 environment
# echo 'GRUB_PRELOAD_MODULES="raid mdraid09 mdraid1x"' >> /etc/default/grub
2. generate a new grub2 config
# grub2-mkconfig -o /boot/grub2/grub.cfg
3. install grub2 again on both your RAID1 disks. Replace sda & sdb with your devices!!!
# grub2-install /dev/sda # grub2-install /dev/sdb
Your box should now properly boot. If it does, enjoy your new Fedora 16 installation!