grub install failed with latest F10 update

I have Googled this problem and tried everything I can think of to fix it, but no luck. I hope someone can help. I have a Nvidia based motherboard, two SATA drives running with NVRaid 1. I upgraded to F10 from F8 and used the scsi_mod.scan=sync kernel option to get around the RAID problem, then did the mkinitrd update, then updates including kernel 2.6.27.9-159. All was well, and I have been using and updating since Jan 12 until today. With today's update, I finished the updates and rebooted and got the GRUB prompt. OK, no problem, I booted from the F10 DVD, entered rescue mode, and ran: chroot /mnt/sysimage grub grub> find /grub/grub.conf (hd0,2) (hd1,2) [note that it is NVRaid1, so found both drives] grub> root (hd0,2) Filesystem type is ext2fs, partition type 0x83 grub> setup (hd0) checking if "/boot/grub/stage1" exists... no checking if "/grub/stage1" exists... yes checking if "/grub/stage2" exists... yes checking if "/grub/e2fs_stage1_5"exists... yes running "embed /grub/e2fs_stage1_5 (hd0)... 23 sectors are embedded succeeded running "install /grub/stage1 (hd0) (hd0)1+23 p (hd0,2)/grub/stage2 /grub/grub.conf"... failed error 22t: no such partition OK, I also tried (hd1,2), and got the same exact messages except for the substitution of (hd1) I exited grub shell and tried grub-install /dev/sda got: /dev/sda does not have any corresponding BIOS drive my device.map file is: (hd0) /dev/mapper/nvidia_adgbjghc The device.map file is the same as it has always been, no change. This is a Linux only machine, no dual boot. Partitions are: /dev/mapper/nvidia_adgbjghcp1 vfat /dev/mapper/nvidia_adgbjghcp2 ext3 /dev/mapper/nvidia_adgbjghcp3 ext3 /boot /dev/mapper/nvidia_adgbjghcp4 extended /dev/mapper/nvidia_adgbjghcp5 ext3 / /dev/mapper/nvidia_adgbjghcp6 swap I also tried booting the rescue with and without the scsi_mod.scan=sync with no difference in the outcome. I have done this grub reinsall on many different systems and never had this problem. Although they were not RAID systems of any kind. I have never had to do a grub install on this system until today. I don't know if it is related to NVRaid, RAID in general, or something else. Any suggestions would be appreciated, other than telling me to use Linux software RAID. I want to get this configuration running. Thank you in advance, Lloyd