[linux-lvm] Unable to boot using LVM for "/"

Les Hazelton seawolf at attglobal.net
Tue Oct 10 03:35:37 UTC 2000

Charles Duffy wrote:
---------snip ----------------
> "root=/dev/vg01/main" fails because the kernel, when booting, just
> determines the major/minor numbers for the root partition based on
> looking up the root device in a fixed table. What you need to do to
> get the "test" entry running is change the root to the major/minor
> number combo in hex; in my case, where /dev/vg01/root has major/minor
> number 58,3 in decimal, I pass "root=3a03" to grub and that works
> correctly.
> Note that the above presumes that the initrd runs correctly. Does it?
> (Be aware that I had to add /dev/console and /dev/tty0 entries to the
> initrd to see output from the programs run from it... this may have
> been fixed by now, or maybe not).
> Hope this has been of some use.

Actually, it was a great help.  I have it working now - sort of.  The
problem was in two parts. I changed the grub menu.lst to pass
"root=3a06" as you suggested and that changed some of the symptoms. When
it still didn't work as expected I reread the lvmcreate_initrd script.
It finally sunk in. The initrd creates the ram disk file system as ext2
and I had created my root LV using reiserfs.

This creates a conflict between the initrd root file system and the one
on the logical volume and the mount won't work.  I re-formatted my LV
with mke2fs and made some changes to /etc/fstab. Now it works as
expected. It looks to me like you can't use reiserfs for the root file
system unless the initrd ram disk can be created using reiserfs. I don't
think that will work.


Good Journey, longevity and prosperity to all

Les Hazelton

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