Description of problem:
raid1 install fails on FC4. take 2 drives (pata, sata, doesnt matter)
partition them both like:
hda1: 128mb
hda2: swap 1gb
hda3: remainder

then:
md0 = hda1+hdc1 = /boot
md1 = hda2+hdc2 = swap
md2 = hda3+hdc3 = /

installer goes through all the motions up till reboot. after reboot, kernel is
unable to mount root (eg, unable to mount device 9,2)

Version-Release number of selected component (if applicable):


How reproducible:
always

Steps to Reproduce:
1.follow steps above
2.
3.
  
Actual results:
unable to mount root device 9,2

Expected results:
it should work

Additional info:
by booting into linux rescue, and rebuilding the initrd, it fixes the problem.
so it seems the fedora installer is making an incorrect initrd for raid1.