Dilemma: GRUB legacy will not upgrade to GRUB2 on my machines. The systems were originally built to "fake out" GRUB legacy by using a 1.0 superblock on a pair of RAID1 members and pointing GRUB to one or the other of the disks so it can chain load from what it thinks is an ordinary primary partition. Once initrd loads and md is active, it assembles the arrays and then the kernel mounts / and then /boot, and booting continues normally. The cause: When dpkg instructs grub-pc to configure itself, it fails because it is unable to reconcile the information in /boot/grub/menu.lst with the hardware mounted by /etc/fstab. The cure? : I was thinking I should be able to comment out the entries for /dev/md1 in /etc/fstab and /etc/mdadm/mdadm.conf, and reboot the system. Then I think I can 1. Mount /dev/hda1 to /boot. 2. Upgrade GRUB, which should now understand both /etc/fstab and /boot/grub/menu/lst. 3. Reboot to make sure it works. 4. Edit /boot/grub/grub.cfg and /boot/grub/device.map to let GRUB2 know it should be booting from an array and to make sure it is loading the RAID1 module. 5. Umount /boot and create a new 1.0 superblock RAID1 array using only /dev/hda1 and a missing member. Mount the new array as /boot. 6. Add the new array info into /etc/mdadm/mdadm.conf and change /etc/fstab back to mount /dev/md1. 7. Run update-initramfs to copy the new configuration into initrd. 8. Reboot and make sure GRUB2 can now boot into the new array. 9. Add /dev/hdb1 into the new array, and re-sync the array. 10. Update /etc/mdadm/mdadm.conf with the full array info, getting rid of the missing member, and remove the reference to the old array altogether. 11. Run the GRUB update routine to remove the chain-load from GRUB legacy. 12. Run update-initramfs to copy the final configuration into the initrd (if GRUB update doesn't already do it.) Is my thinking correct, here? Have I missed a step? Up until step 9, I should be able to easily revert back to my original configuration by simply removing the comment for the old array, forcing an assembly of the old array using only /dev/hdb1, add back /dev/hda1, resync the array, remove the comment from /etc/fstab and run update-initramfs. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
