Bob
I did get my system running, but I am using IDE drives.
My problem related to the BIOS settings for the drives. When installing drives for mirroring the geometry needs to be the same (there is a bug report on this) but although I had two identical drives and had configured the drive types as "normal" I had left the geometry as 'Auto'. So the RAID was showing as only 10Gb not 20Gb and LILO would not boot.
Once I had set the BIOS to 'user' and entered the Heads, Cylinders, and Sectors, then reinstalled SME 5.1.2 all worked fine.
So if you are using SCSI this will not help you. However I would suggest looking at the basics as this is what caught me out. ie SCSI termination, is the controller supported fully, can you install correctly on a single drive, SCSI ID numbers, etc
Sorry I can't be of more help.
Dave