Re: unbootable system after fresh 4.0r5 installation
On 2008-12-11 12:50 +0100, Jukka Salmi wrote:
> Boyd Stephen Smith Jr. --> debian-user (2008-12-08 16:46:46 -0600):
>> http://reactivated.net/writing_udev_rules.html
>
> Thanks, udev(7) is probably what I was looking for.
>
> I tried two approaches:
>
> 1) Using built-in persistent symlinks (/dev/disk/...).
> 2) Writing custom rules to create symlinks to the desired file system
> block devices.
>
> I then used those symlinks in /etc/fstab and /boot/grub/menu.lst
>
> While 1) worked fine, I noticed a problem with 2): passing the symlink
> to the root file system as the root= kernel option doesn't work ("ALERT!
> /dev/root doesn not exist"...). I guess this makes sense since my
> custom rule which defines the root file system symlink is in a file on
> the root file system (/etc/udev/rules.d/010_local.rules)... But why
> does 1) work then? The symlinks I use (/dev/disk/by-id/scsi-XXX-partN)
> seem to be defined in /etc/udev/persistent.rules, i.e. also on the root
> file system:
>
> KERNEL=="sd*[!0-9]|dasd[!0-9]*|sr*", ENV{ID_SERIAL}=="?*", \
> SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_SERIAL}"
> KERNEL=="sd*[0-9]|dasd*[0-9]", ENV{ID_SERIAL}=="?*", \
> SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_SERIAL}-part%n"
>
> Any hints?
Have you rebuilt your initramfs? Udev and the whole /etc/udev directory
are copied into it, so you need to run "update-initramfs -u" to have
these rules available at boot time.
Sven
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