On Mon, 2007-01-22 at 11:32 +1100, Andy wrote: > > Date: Sat, 20 Jan 2007 20:16:28 +0000 (UTC) > > From: Beartooth <Beartooth@xxxxxxxx> > > Subject: VDQ Grub > > > Very Dumb Question : I have tried about four times now, using an old > > pentium2 with two hard drives (20 GB and 30 GB) to install both CentOS 4.4 > > and Fedora Core 6 in such a way as to enable dual-boot between them. > > > > I've tried it by installing 4.4 first, and then FC6. I've tried it by > > installing FC6 first, and then 4.4. I've tried it with and without giving > > the installer permission to use both drives. > > > > I always end up with ability to boot only to one OS, usually the one > > installed last. Between tries I wipe both drives with DBAN. > > > > Surely there must be something I'm doing wrong, obvious to many but not to > > me. Clue, please? > > The way it works for me is: > > 1) Install distro 1 on the first drive, and let it put its GRUB into the MBR > of the drive. Mostly that is what installers want to do by default > > 2) Install distro 2 on the second drive but make it put its GRUB in the root > partition of the second drive. Looking at the RHEL installation guide, this > will be done via the "Configure advanced boot loader" option in the > Bootloader Configuration phase > > 3) Once the installation of distro 2 is complete, boot into distro 1 and > modify /boot/grub/menu.lst to include: > > title Distro 2 > rootnoverify (hd1,0) > chainloader +1 > > If there is any chance that you will want distro 2 to be the default at some > stage, put this before distro 1, which will look like: > > title Fedora Core (2.6.14-1.1656_FC4) > root (hd0,0) > kernel /vmlinuz-2.6.14-1.1656_FC4 ro root=/dev/VolGroup00/LogVol00 rhgb quiet > initrd /initrd-2.6.14-1.1656_FC4.img > > and modify the > > default= 0 > > to 1 > > Then if you later want distro 2 to be default you can change it back to 0 > again. Doing it this way round avoids confusion if distro 1 gets a kernel > upgrade and a new title line is added. > > I can recommend the following for GRUB wisdom: > > * http://www.linuxquestions.org/linux/blog/saikee > * A grub menu booting 100+ systems of Dos, Windows, Linux, BSD and Solaris: > http://www.justlinux.com/forum/showthread.php?t=143973 > * Just booting tips: http://www.justlinux.com/forum/showthread.php?t=144294 > * Saikee's grub booting tips: > http://www.justlinux.com/forum/showthread.php?p=837905#post837905 > I want to mention that this is exactly what I do (add all other booting as rootnoverify. This a very flexable way to do things ... for example, if you have a drive that contains all the parts to boot the 2nd OS, you can move it to a new machine and point grub to boot it there very easily. You can also easily add a 3rd or 4th or 5th OS, etc. More recently, I have been setting up VMs via VMware instead of setting up dual boots, but this method is the one I personally use for dual booting.
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