On Tue, Jul 03, 2018 at 04:43:32PM -0400, Chris Ross wrote: > [- tried to grub-install onto /dev/sda1 and /dev/sda2, won't boot, Illegal > Instruction. -]
> So, I fear some of this is based on the fact that I'm running grub-install > into raid filesystems that are mounted as a RAID1, but I'm sticking things > into them at the same time. Or maybe it's more complicated, but the fact > that I'm writing into the raw partitions under an md RAID certainly seems > of concern. :-/ So I'm even more confused now. I was unable to boot disk0 or disk1, but also got errors booting off of disk3, which had been working. So I booted into rescue cd, re-ran the grub-install onto /dev/sdd1, then rebooted. Came up fine, as before. When it did, I did nothing but log in, then re-run "grub-install --force --skip-fs-probe" onto each of /dev/sda1 and /dev/sda2, while /dev/md0 wasn't mounted. Nothing on the first three disks had been accessed since boot. Sadly, this did not make those disks bootable either. But, surprisingly, I now can't boot off of disk3 again. Even after a "reset-all", I see: Boot device: disk3 File and args: GRUB ERROR: Last Trap: Illegal Instruction So, I've no idea how merely running grub-install onto /dev/sda1 and /dev/sdb1 could possibly have messed up the grub on /dev/sdd1? I am booting into rescue cd again now to repair that, but I'm starting to feel that grub is acting for some evil spirit and I am failing to meet whatever it's needs are.... - Chris ps, re-grub-install'ing to /dev/sdd1 allowed the system to boot again. I rebooted a few times, seems to have remained functional. I also after a few successful boots to sdd (aka disk3), tried booting from PROM to disk0 again, got the Illegal Instruction, but was then still able to boot disk3.