After updating from redhat network, my system I received the following error:

VFS: Cannot open root device "LABEL=/" or 00:00
Please append a correct "root=" host option
Kernel panic: VFS: Unable to mount root fs on 00:00

My grub.conf file is:
default=0
timeout=10
splashimage=(hd0,1)/grub/splash.xpm.gz
title Red Hat Enterprise Linux ES (2.4.21-32.EL)
root (hd0,1)
kernel /vmlinuz-2.4.21-32.EL ro root=LABEL=/ hdc=ide-scsi
initrd /initrd-2.4.21-32.EL.img
title Red Hat Enterprise Linux ES (2.4.21-4.EL)
root (hd0,1)
kernel /vmlinuz-2.4.21-4.EL ro root=LABEL=/ hdc=ide-scsi
initrd /initrd-2.4.21-4.EL.img
title XP
rootnoverify (hd0,0)
chainloader +1


As you can see I have two kernels available. The "older" kernel ,
2.4.21-4.EL, is running just fine. Since the new kernel is more up to
date, I would much rather try to get the other on working.

I checked and compared the referenced the img files and here is the
info:
-rw-r--r-- 1 root root 165303 Apr 19 21:58
initrd-2.4.21-4.EL.img

-rw-rw-r-- 1 root root 164452 May 18 15:01
initrd-2.4.21-32.EL.img

and I see that both files are similar except that the new kernel has
an extra "w" in the group.

The other two files are the same:
-rw-r--r-- 1 root root 1236945 Oct 3 2003
vmlinuz-2.4.21-4.EL

-rw-r--r-- 1 root root 1252573 Apr 15 21:34
vmlinuz-2.4.21-32.EL

Any ideas?

Thanks,

It seems like your kernel is not configurated correctly, please make sure that your kenel configuration include devfs option, ext2,ext3, and other required file system, both in built in mode.

I think you need to compile the kernel again.
make sure to make all filesystems(exept for the filesystem of your root partition whitch you need to be compile into the kernel) modules in the configutration.

Thank you for the suggestions.

Interestingly enough the two kernels are: vmlinuz-2.4.21-32.EL and vmlinuz-2.4.21-4.EL.

The program up2date is asking me to use the vmlinuz-2.4.21-32.EL kernel! I would say that the higher the number the newer the kernel.

Any way, I will find out how to go about compiling the kernel.

Any URLs that anyone can suggest?

EDIT:
I found http://www.redhat.com/support/resour...e-upgrade.html
that seems very interesting.

Thanks,

Evan

Hi there,
Check the modules.conf file; if this is buggered when you installed the new kernel, mkinitrd ran and could have left out the disk driver (or it could have changed name) HP used to have a cciss driver that was called cciss_432, this went into the modules.conf file; when the kernel was upgraded the module was called cciss_555 (example numbers) so mkinitrd ran, an insmod cciss_432 was included in lt linuxrc script which now was removed and panic...... Other things are controller orders in modules.conf.


hope this helps


lxtwin