SuSE 8.1 CD-ROM/DVD-ROM SCSI Emulation Fix
This is NOT the SuSE database fix.
Your computer is equipped with a CD-RW drive and one or several "ordinary"
CD drives. After installing SuSE Linux 8.1, one or more of the CD drives
cannot be mounted.
Some modules are missing from initrd.
From SuSE Linux 8.1 on, the CD drive support is no longer compiled and kept
in the kernel, but implemented by way of modules (cdrom and ide-cd). As
opposed to the module ide-scsi, those modules (cdrom and ide-cd) are not
included in initrd. That is why the SCSI emulation reaches all drives
and not only those listed in the kernel parameter hdX=ide-scsi.
Procedure 1. SOLUTION
Open the YaST Sysconfig Editor. /etc/sysconfig. Select -> ->
Insert the modules cdrom and
ide-cd after the
root=/dev/hdaX listing. Be careful not to remove
any of the modules listed, since they are necessary for booting.
Edit the /boot/grub/menu.lst file, making the
following additions in this order:
max_scsi_luns=1 hdb=ide-scsi hdc=ide-scsi
(in the linux kernel line, after the root=/dev/hdaX entry).
Now, execute the mk_initrd command as root. To do
this open a terminal program like konsole or xterm and log in as root
with the command su -. Then enter the command
mk_initrd. If your boot manager is LILO, reinstall
it with the command lilo -v. As GRUB is the standard
boot loader from SuSE Linux 8.1 on, this will not apply for most. This
will allow all devices to be emulated as SCSI.
Reboot the system for changes to take effect.
Now determine the SCSI device numbers assigned to your physical IDE
devices using the cdrecord -scanbus command. The
command output will give you the numbers needed to link your newly
emulated SCSI devices.
EXAMPLE: If there is a 0) before your
DVD device, then your DVD device should be linked to SCSI device 0.
Hence, the command you would use is ln -sf /dev/sr0
/dev/dvd. If it was your CD-ROM instead of your DVD-ROM you
would use ln -sf /dev/sr0 /dev/cdrom.
If your CD writer follows after a 1), then the command will be
ln -sf /dev/sr1 /dev/cdrecorder. The combination of
sr0 and sr1 and the devices cdrom, dvd and cdrecorder depends on the
numbers listed in the line from the cdrecord
Using the information obtained from the cdrecord
-scanbus command (see Step 3), point all
devices (dvd, cdrecorder and cdrom) to their respective scsi
Example: ln -sf /dev/sr0
/dev/dvd links the dvd to the scsi device sr0.
Type hwscan --list as root. Note all keys for each
CD device. There will likely be multiple entries for any given CD
device. Delete each of the noted CD device entries in the /var/lib/hardware/unique-keys directory.
Deleting the unique-key CD device entries can easily be done in
Konqueror as root. To do so, log in as root, follow the
hwscan --list portion of this step from a konsole
Then open Konqueror, delete any of the unique-key files associated
with a CD device, (
Open a konsole session and type the hwscan --cdrom
command to populate the newly added (and correct) unique-key CD device
Reboot your system and you should have two working devices with no
errors at boot up.
Copyright © 2002, 2003, 2004 Togan Müftüoğlu.