Re: [gentoo-user] Re: 4 machines - no /dev/cdrom or /dev/dvd anymore

[Dale]

Mark Knecht wrote:
> On Sun, Jan 6, 2013 at 6:29 PM, Dale <rdalek1967@×××××.com> wrote:
> <SNIP>
>> This links goes to a specific post in the thread.  Don't scroll or you
>> will have to dig.  The one to look far if it messes up is the post by
>> NeddySeagoon.
>>
>> http://forums.gentoo.org/viewtopic-p-6362608.html#6362608
>>
>> More info:
>>
>> http://www.gentoo.org/doc/en/kernel-config.xml#doc_chap3
>>
>> According to one page I found, this happened several years ago so no
>> idea how anyone missed it this long.  It was discussed on this very list
>> but my archives don't go back that far.  I figure if I don't run into a
>> problem in a year or so, I missed it which is a odd thing of itself
>> since I usually find every problem there is.  ;-)
>>
>> Dale
> Dale,
>    Thanks for digging that up. It's interesting, but I don't think
> it's exactly relevant. TTBOMK I've used /dev/sdX and /dev/srX for as
> long as it's been available. Most of my machines these days were all
> built after the change so it's all they've ever known. Maybe one
> machine used /dev/dhX.
>
>    However, that's not the issue I'm looking for background on. You
> seemed to say earlier that it's a widely known thing that udev links
> to /dev/srX are not only broken but also bogus. You don't use them.
> Others have seen the same issue. I've seen the udev links not work for
> a couple of months.
>
>    However from what I can tell you don't use them
> 1) because they broke, and
> 2) like me you never took the time to determine _why_ they broke.
>
>    I was in the same place until yesterday when I decided to dig in a
> little bit. Now, my point is that while the old links created in old
> rules files are broken (and they are) it's not clear to me that udev
> is broken. Clear Kay Sievers (sp?) still assumes they work although
> they will automatically only do /dev/sr0. The use is responsible for
> creating others if they need them. (Which 99% of folks will not, so
> basically, it still works.)
>
>    What appears to have actually broken is the old PCI path
> nomeclature, and not 'udev proper', as best I can tell.
>
>    Anyway, it's well known in the known universe that you are mad at
> udev so I don't expect you're looking for ways to make this stuff work
> and I do appreciate you digging the stuff up that you found. Thanks.
>
> Over and out,
> Mark
>
>

I think you misunderstand or I didn't make myself clear.  I'm not saying
it was udev that did this.  I am pretty sure it was the kernel.  All
this happened when people with older IDE drives, myself included on my
old machine, had to switch to the new drivers and devices.  Before the
change, old IDE drives and CD/DVD drives were given hd* devices and udev
made a link to that with /dev/cdrom or dvd or whatever for optical
devices which is what you seem to expect now.  The reason udev did that
was for it to be consistent which I have no problem with .  When the
kernel folks changed this, they also changed it from /dev/cdrom and
/dev/dvd to /dev/sr0.  From my understanding, all optical devices such
as CD and DVD readers/burners are supposed to be sr0.  I know k3b
updated theirs too.  I seem to recall I had to run a unstable version
for a bit because the older version didn't have the code to see sr* devices.

I never said anything was broke, just that it was changed.  There was
several things that was changed at about the same time that were related
and this was just one of them.  Another was the change from /dev/hdXX to
/dev/sdXX for ALL hard drives.  This change happened even if you was
using the old IDE drives.  As I understand it, /dev/hdxx is no longer
supported on current kernels.  All hard drives are /dev/sdxx and optical
drives are /dev/sr0(1,2,3,4 etc). 

Also, I didn't remove anything. It was changed by the kernel which also
lead to udev changing what it did.  Again, as much as I dislike what
udev is planning, I never said udev did this one.  I'm pretty sure this
was all started with the kernel devs.  The udev folks just followed along. 

The biggest thing I recall is everyone with IDE drives having to update
the kernel config, edit fstab and grub or lilo before rebooting.  This
was discussed on this list and I don't recall much fuss except for
having to change it and update everything.  It was sort of a one time
thing and had a long term goal.  All hard drives are sdxx and optical
devices are srx.  All this happened when I was on my old rig which was
at least a few years ago. 

Does that make more sense now? 

Dale

:-)  :-) 

-- 
I am only responsible for what I said ... Not for what you understood or how you interpreted my words!