I am having a similar problem. When I try to install ClearOS 7.4.0.204729 on my Microserver Gen8 (with BIOS dated 6/2014 or something as I have failed trying to update the BIOS) following the online guide it asks for a biosboot partition and when I try doing that in RAID 1 the system won't boot but when I accept the automatic configuration of just installing it on sda it will boot but only if the first HDD is working so I don't have redundancy. Any ideas on how to fix this?

Thanks.