GRUB + LVM + Raid 1 and 6

[roger p]

 I have installed Fedora Core 8 in a machine with 4 disks each 200
 GBytes; sda, sdb, sdc, sdd
 
 the partitioning is the following:
 
 md0: /boot     (Raid-1 (2 disks + 2 spare disks))
 md1: /            (RAID-6, (4 disks) + LVM)
 - the LVM has logical volumes:
   - / for the linux (00)
   - /home the rest (02)
   - swap (01)
 
 When I now start the server it stops without any GRUB menu coming up,
 the error message "GRUB hard disk error" is displayed.
 
 When I start through the linux rescue it works fine. It reads the hard
 disk and no problem when I do the chroot /mnt/sysimage
 
 What is the problem? It seems that the hard disk ctructure can not be
 read by GRUB.
 
 What to do?
 
CK
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