(In reply to Marco M. from comment #39) > In my case the "enable redundancy for md array" option has never appeared! > (tested in 12.3, 13.1 and 13.2 beta1) > I know. > 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. That's mdraid problem then.