sync) finally finished the install AND IT DIDNT WRITE THE BOOT RECORD! when it rebooted i got my grub menu from GENTOO! - strike two,
Grub doesn't understand raid - is your /boot on an md device?
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I have grub booting off /dev/md0 right now which is mounted as /boot. And have with gentoo and many other distros, I think you have been mis-informed.