After reading all HOWTO’s I could find, I have found a solution which worked for me:
# fdisk -l would returned Disk /dev/md0 does not have a valid partition table.
Started system from rescue disk,
# chroot /mnt/sysimage
grub > device (hd0) /dev/sda
grub > root (hd0,0)
grub > setup (hd0)
grub > device (hd1) /dev/sdb
grub > root (hd1,0)
grub > setup (hd1)
rebooted the system and it worked,
after a few days with Fedora installer I have noticed an lot of bungles, during customizing packages, anaconda installer crushed several times, finally I give it up I was not able to customize it. I had to proceed with default installation ! I have never have such a problems with Fedora5, RHEL4, and older RH.
Regards to you all