On Mon, 30 Apr 2012, gregrwm wrote: On ? Mike Miller Wrote: >> Unable to install GRUB in /dev/sda >> Executing 'grub-install /dev/sda' failed >> This is a fatal error. >> >> Everything was being installed to /dev/md0 (/) and /dev/md1 was swap. >> >> Apparently, GPT is an alternative to MBR, so that could have something to do with grub-install failing to install GRUB to the MBR. (Ya think?). So I'm not even sure of why I tried, but I didn't know what else to do at 5 am yesterday morning after fighting with this thing all last night! Now I'm back at it. I decided to continue the Ubuntu installation after the failed step. I see this message: >> >> "No boot loader has been installed, either because you chose not to or because your specific architecture doesn't support a boot loader yet. >> >> "You will need to boot manually with the /vmlinuz kernel on partition /dev/md0 and root=/dev/md0 passed as a kernel argument." I haven't done this before, but I have read about the need to install grub on the disks and not the mirror. http://www.ogalik.ee/installing-grub-on-md-raid-boot-device/ So, you just use a rescue disk to install grub on both real disks. Not on the RAID. You might be able to test this using a grub boot disk (usb stick or CD) Other thoughts along the same line: http://www.spinics.net/linux/fedora/fedora-users/msg412422.html http://en.gentoo-wiki.com/wiki/RAID/NVRAID_with_dmraid#Installing_GRUB http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5 -- Gerry Skerbitz gsker at skerbitz.org