Butch Kemper wrote:
At 11:17 AM 4/6/2008, Hugo Vanwoerkom wrote:
Butch Kemper wrote:
Back in February, I asked a question about problems I was having with
the hard disks sequence flip-flopping when I would boot: disk #1
would be hda and disk #2 would be hdc; or disk #1 would be hde and
disk #2 would be hda.
I receive answers about using labels with the partitions so, I
labeled the partitions and updated /etc/fstab. This is how things
now look:
IDE #1 Partition Label Mount Point
1 / /
2 swap1 swap file
3 /usr /usr
4
5 /usr/local /usr/local
6 /var /var
IDE #2 Partition Label Mount Point
1 /var/poptemp /var/poptemp
2 /var/mail /var/mail
The /etc/fstab:
# <file system> <mount point> <type> <options> <dump>
<pass>
proc /proc proc defaults
0 0
LABEL=/ / ext3 defaults,errors=remount-ro
0 1
LABEL=/usr /usr ext3 defaults
0 2
LABEL=/usr/local /usr/local ext3 defaults
0 2
LABEL=/var /var ext3 defaults
0 2
LABEL=/var/poptemp /var/poptemp ext3 defaults
0 2
LABEL=/var/mail /var/mail ext3 defaults
0 2
LABEL=swap1 none swap sw
0 0
Now the partitions and mount points get assigned correctly no matter
which order the drives are assigned.
The remaining problem is with the GRUB and the kernel. It was
suggested that a LABEL specification be placed in the
/boot/grub/menu.1st entry so that:
# kopt=root=/dev/hda1 becomes
# kopt=root=LABEL=/
Using a LABEL in the Grub menu does not work because the kernel get
confused:
1. If kopt=root=/dev/hda1 and the disk order changes to make
the boot disk be /dev/hde, the boot process stops and drops
into a prompt. I can unmount /boot, mount /boot on the
correct drive, give a CTL-D to the prompt, and the system
would continue to boot.
2. If kopt=root=LABEL=/, the boot process will stop and drop
into a prompt WITHOUT /boot being mounted. I can mount
/boot on the correct drive, give a CTL-D to the prompt,
and the system will continue to boot.
No where have I been able to find any documentation that shows that
the Kernel boot command root= can have a LABEL specified.
# kopt=root=LABEL=wd80_0jd-60.05 ro noapic vga=791 apm=on ddcon=1
network quiet
WFM
but you are still stuck with the GRUB root command, which does not
accept a label.
So I changed grub (0.97-29) to accept this:
find /ST380011A.03
root FILE=/ST380011A.03
and then where he finds file ST380011A.03 that is where the root will be.
Now I have a truly LABEL driven system and the drive devices can be
wherever they are and I don't care...
Hugo
So, how do I make the kernel consistently detect and assign the disks
in the correct order? Someone suggested the problem lies with UDEV
and the parallel hardware detection process.
Hugo,
I understand the "find" command and the results that it returns. But I
am unable to locate any mention of the "root" command having a "FILE="
option.
So, did you modify Grub to make the "root" command have a FILE= parameter?
Right. FIND saves where it found the file and root with FILE= uses that
saved info. So I don't have to specify absolute locations. I can send
the diff if you tell me where.
Hugo
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