[gentoo-user] Re: DVD borked: SysFS removed

[walt <w41ter@gmail.com>]

On 08/20/2010 11:33 AM, James wrote:
> walt<w41ter<at>  gmail.com>  writes:

>> $ls -l /dev/dvd
>> lrwxrwxrwx 1 root root 3 2010-08-17 04:46 /dev/dvd ->  sr0
>
> I get: ls: cannot access /dev/dvd: No such file or directory

I forgot an important detail.  Your device drivers have changed, so your
disks will now show up as different devices.  However, your old devices
still appear in /etc/udev/rules.d/70-persistent-cd.rules, and that causes
confusion.  The right way to fix it is to delete that file and let udev
recreate it during the next boot.

>
>> I didn't do anything to cause that.  udev took care of it without my help,
>> and everything Just Worked.
>
>> Well, not quite true.  I did change my /etc/fstab, but I'm now using disk
>> labels in fstab instead of device names.  If you still use device names
>> you'll need to change /dev/hd* to /dev/sd* in fstab when using the new
>> disk drivers.
>
> my current fstab looks like this:
> /dev/cdrom  /mnt/cdrom  auto noauto,rw,user   0 0
>
> Can you send me a snippet out of your fstab on setting up (2)
> dvds on one system?

I don't have any machines with two dvds, but if you delete the file I
mentioned above, you should start to see device names that make sense
the next time you reboot.  Start with that and see what happens.


> Disk labels sound cool. Maybe a good doc
> explaining these intricacies?

Look at man mount and look for "The device indication" section. For example:

LABEL=root	/        ext3            noatime,nodiratime,defaults     0 1
LABEL=home      /home    ext3            noatime,nodiratime,defaults     0 1

I labeled those two partitions with the names 'root' and 'home' using e2label,
though it might be less confusing if I had used upper case letters instead.
You can pick any label you want, of course.