Red Hat Bugzilla – Bug 10645
Can't choose SCSI MBR for LILO when ide drive installed
Last modified: 2008-05-01 11:37:55 EDT
When installing Red Hat v6.2 on Intel, It's not possible to choose the MBR
on the SCSI-disk for LILO. However, I can choose my IDE-disk wich I'm not
using as a "system" disk. Is this a bug? I solved it by simply unplugging
the IDE-disk during the installation phase and when it was all done, I
rebooted the PC and connected the disk again. It works fine now.
Traditionally PC hardware was unable to boot from the anything other than
what BIOS considered the first two drives, which normally are IDE. Newer
BIOS's remove this restriction as you may very well know. It is under
consideration to remove this restriction in the installer as well in future
Lilo is unfortunately still not very good at dealing with combined scsi/ide
It just blithely assumes the ide disk will be first. If you just add an ide
disk to a previously scsi-only system (and your bios is smart enough to still
boot from the scsi disk), you are in for trouble. The next time you type
'lilo', it prints the innocent sounding "Warning: /dev/sda is not on the first
disk", and then proceeds to totally f-up sda's boot sector (it be set to load
linux from the location on hda where the boot file on sda is actually located).
It will be a while before you successfully re-boot your system after you do
I spent about 6 months doing what Robert did - disabling my ide disk every time
I ran lilo (this can be done by disabling onboard-ide in bios, so at least you
don't have to open the case). I eventually discovered the correct way to handle
this situation, which is to put the two extra lines:
into lilo.conf. This tells lilo that sda really is the first disk.
I think it would be *really great* for the redhat installer to become smart
enough to do this. Then others like Robert and myself won't have to suffer in
the future. In fact, it wouldn't hurt to add those lines to the lilo.conf file
of any PC system which has only scsi disks in order to prevent problems later on
if ide disks are added.
jeff's notes on the lilo -v problem has been opened in a separate bug 11093...
*** Bug 10388 has been marked as a duplicate of this bug. ***
Moving to RESOVLED - DEFERRED from CLOSED - DEFERRED
*** Bug 54966 has been marked as a duplicate of this bug. ***
For future releases of Red Hat Linux, you will be able to reorder the boot
devices if you are using the GRUB boot loader