Darac Marjal wrote: > Andrew Wood wrote: > > Ive got 2 disks in a RAID1 mirror and am trying to setup Grub 2 so that I > > can boot from either disk if one fails. > > Ive tried using dd to copy the MBR over but when booting from one of the > > disks I just get the word GRUB which I guess is because its looking for the > > stage 2 loader on the other disk? > > > > How can I configure Grub2 correctly such that I can boot with either disk > > removed? > > I think you should be able to install grub (that is, run grub-install) > for both devices (grub-install /dev/sda ; grub-install /dev/sdb # for > example).
Using grub-install /dev/sda ; grub-install /dev/sdb should definitely work for both disks. It is definitely good to test. Andrew I applaud you for doing the testing of the installation. That is awesome. If all else fails and it were me I would swap the cables so that the order of sda and sdb are reversed. Then use grub-install /dev/sda to write the mbr onto the new sda drive. Then swap them back, although that shouldn't matter at that point. It is good to know that you can use the debian-installer in rescue mode to boot and chroot to the system in order to run grub-install there even if the BIOS booting drives won't boot. Bob
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