On Wed, Jun 30, 2010 at 11:24 PM, splotz90 <sebastian-pl...@web.de> wrote: > Am 01.07.2010 05:17, schrieb Bruce Dubbs: >> I'll ask the question again. How is search useful in an LFS >> environment where we don't have initrd available? > As I already said: > > The search command is only useful if we're using a seperate boot > partition ... > > With help of the search line, GRUB can find the boot partition, even if > the device of the boot partition has changed (for example /dev/sda3 --> > /dev/sda4). > After that, GRUB will boot the kernel. The kernel can mount the root > partition. > > If the device of the root partition has changed (for example /dev/sda1 > --> /dev/sda2) the boot process will fail (the kernel won't be able to > boot the root partition). > > But we have to use a LABEL or UUID entry for the boot partition in > /etc/fstab (if we're using something like /dev/sda1 if fstab, the mount > of the boot partition will fail).
no you dont. / is already mounted. If you say it's in /dev/sdz65, it'll be fine. After it boots (when it hits the bootscripts), /etc/rc.d/init.d/checkfs has a "mount / -o remount,ro'. It does not parse /etc/fstab as / is already mounted Next time, fstab is used is in mountfs. This is where LABEL or UUID is useful for all partitions "except" /. Infact, if you boot with root=/bin/bash, / is still mounted, and /etc/fstab will never have been read > This means: If the LFS-User changes the device for the boot partition, > the system will still boot (with help of the search line). > > So I suggest that we are writing the following: > > > "The search lines are only meaningful for LFS systems if a separate boot > partition and a LABEL or UUID entry for this partition in /etc/fstab is > used." /etc/fstab is only useful "after" / is mounted. so I would remove the part that says "separate boot partition and a LABEL or UUID entry for this partition in /etc/fstab is used." (the rest of the sentence does not stand well on it's own though). the linux kernel has to mount something as / and all it has to work with are (a) root=, or (b) the drive/partition# embedded at compiletime. > I think, I've started a big discussion with just one small ticket ;-) -- Nathan Coulson (conathan) ------ Location: Brittish Columbia, Canada Timezone: PST (-8) Webpage: http://www.nathancoulson.com -- http://linuxfromscratch.org/mailman/listinfo/lfs-dev FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page
