On Fri, Jul 9, 2010 at 4:10 PM, Miles Fidelman <mfidel...@meetinghouse.net> wrote: > Tom H wrote: >> >> On Tue, Jul 6, 2010 at 8:15 PM, Miles Fidelman >> <mfidel...@meetinghouse.net> wrote: >> >> >>> >>> shell> grub-install hd0 >>> shell> grub-install hd1 >>> >> >> With these grub-install invocations, you will not be able to boot in >> degraded mode. >> >> You have to set both sda and sdb to hd0 but you cannot do that in >> device.map. You have to use the grub shell: > > I'm pretty sure you're wrong on this - at least it's worked for me in the > past. > > You DON'T have to set both sda and sdb to hd0 - what you have to achieve is: > > 1. have identical bits in /boot on both drives - so that they can be read > before the raid array gets created > -- if you've built with RAID-1, and done a standard install, this happens > automatically > > 2. get grub installed on the MBR of both drives - so your BIOS can boot off > either drive > -- grub-install does this for you > > 3. set up your BIOS to fallback to sdb if sda fails to respond > > 4. set up your menu.1st to boot off sdb if sda fails to respond > > I'm pretty sure that things will break badly if grub things that both disks > are hd0.
It is a standard procedure to ensure that you can boot from a degraded raid1 array: http://en.gentoo-wiki.com/wiki/Software_RAID_Install#Installing_Grub_onto_both_MBRs -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/aanlktilmmyuntz5jqukvxi1lf6g1w8vwx0e7c1duy...@mail.gmail.com
