Emmett Culley writes:
I suppose I should put in a bug report, and I will, but I'd like to know if I am the only on experiencing this issue.
Not with the last couple of Fedora releases, but before then, on one of my machines Anaconda would consistently get the drive order wrong. Before anaconda rebooted, I always had to drop back to a shell, chroot to /mnt/sysimage, fix the Anaconda-generated /boot/grub/device.map to show the correct boot drive order, and reinstall grub. The Anaconda kernel would not assign the same driver letters that the regular kernel would. In the early part of the Anaconda installer's kernel boot, it manually probes drivers for identified hardware, and, in some previous Fedora releases, it was apparently doing it in a different order than the ultimately installed kernel would load the modules from linuxrc. Hilarity ensued.
The problem is that device.map needs to list the drives in the same order that the BIOS enumerates them at POST, and it's not always possible to figure out what it is, long after the kernel finished booting. It's often highly dependent on the individual motherboard's details, and sometimes there are even BIOS options that let you specify the disk boot order.
What you need to do is, first, identify the order in which your hard drives are enumerated by your BIOS and power on. You should be able to do that by carefully examining its messages.
Then, before you act upon Anaconda's prompt to reboot, switch to the ALT-F2 shell, figure out how your drives are mounted, chroot to /mnt/sysimage, fix the Anaconda-generated device.map to map each drive to its BIOS order, make sure that grub.conf refers to the root volumes by their UUID or label, and then rerun /sbin/grub-install.
When you reboot back into the regular kernel, if the drive order is different, you'll need to update device.map again, otherwise the next time a kernel update gets installed, you may end up breaking grub again.
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