When installing rc11 on a 5 year old Supermicro server with two 1TB drives in sw RAID1 everything looks good during the install phase. The array comes up properly and the installation proceeds normally. However when rebooting fom the drives mdadm does not recognize the array and the installation is booted with 'sda1' mounted as the primary disk.
When looking at 'cat /proc/mdstat' the array is recognized but only with one member (sdb1).
If I reboot back from the ISO again the array is properly mounted and mdstat looks good with both sda1 and sdb1 as members.
This is unfortunately not reproducible on vmware. Please ask and I will provide any output required from the server.