[linux-lvm] root fs on a LVM cause kernel panic
Andreas Dilger
adilger at turbolabs.com
Fri Nov 16 18:18:01 UTC 2001
On Nov 16, 2001 17:19 -0500, Daniel Savard wrote:
> While booting I am ending with a kernel panic message. The few last lines of
> the boot message are as follow:
>
> VFS: Cannot open root device "3a01" or 3a:01
> Please append a correct "root=" boot option
> Kernel panic: VFS: Unable to mount root fs on 3a:01
Hmm, you only get that message when the initial boot is done, so two
possibilities (I'm not an initrd guru, mind you):
1) you need to change the root= line in your lilo.conf to say "root=/dev/ram0"
so that it will boot into the initrd. Then do the real-root-dev trick
(or try pivot_root if running a 2.4 kernel) after configuring the LVM
stuff via vgscan; vgchange -a y.
2) You didn't re-run lilo after changing lilo.conf (yes, you probably did,
but you can never tell from here, and always safe to ask).
> I also tested with ramdisk_size=X, where X is the size returned by the
> lvmcreate_initrd script for the ramdisk.
As long as this is larger than the size of the uncompressed ramdisk, you
should be OK.
Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/
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