Cannot install F18 on pre-existing linux raid

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http://forums.fedoraforum.org – In F17 and earlier I have been able to boot from install disk and then ultimately access a raid 1 and then do a custom install. I select a root partition and home partition, etc., and the size of each, always reserving some free space in the volume group that is on top of my raid 1. In F18 install I can't even see any raid. I have tried several possible boot commands: insmod raid insmod=mdraid insmod mdraid (I can't find a guide to describe the precise syntax for the above, nor any good examples.) I just want to achieve what I could in F17. I want mdadm created raid devices to be vis (HowTos)