Comment # 39 on bug 811830 from Marco M.

In my case the "enable redundancy for md array" option has never appeared!
(tested in 12.3, 13.1 and 13.2 beta1)

I attached a Screenshot showing the bootloader options.

I tried to manually install grub2 on sdb, but the system was still unable to
boot with sda pulled out. The boot process stops in the initrmfs phase, before
root mounting, saying it can't mount root. A very limited emergency shell comes
out after a couple of minute and, from this shell, i was able to see that  the
raid arrays were available (degraded but available) and the lvm logical volumes
for root var and home were ready, so i can't understand why it was not able to
complete the boot phase. I suspect that also the bug 832501 could be still
present. What do you think ?