[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: kernel 2.4.* vs 2.6.* and ATAPI dvd question

Joris Huizer wrote:

Greg wrote:


Seeker5528 wrote:
 > On Sat, 14 Jan 2006 20:17:50 -0400
 > Greg <unix@caribsurf.com> wrote:
 >
 >
 >>>Don't you think it would be more confusing to tell people that SCSI
>>>emulation was built in to ide-cd. If you tell them that then they will 
 >>>be expecting to have srX devices for their drives
 >>
 >>1) I have symlinks:
 >>greg@uniq:~$ ls -l /dev/sr*
 >>lrwxrwxrwx 1 root root 31 2006-01-11 13:52 /dev/sr0 ->
 >>scsi/host0/bus0/target0/lun0/cd
 >>lrwxrwxrwx 1 root root 31 2006-01-11 13:52 /dev/sr1 ->
 >>scsi/host1/bus0/target0/lun0/cd
 >
 >
 > I have not had any srX links since I started using a 2.6.X kernel and
 > stopped loading the ide-scsi module, so clearly there is no scsi
 > emulation here.
 >
 > Since I upgraded to a DVD burner I have 3 links cdrom, dvd, and cdrw
 > all pointing to /dev/hdb.
 >
 > If you actually have SCSI CD/CD-RW, DVD/DVD-RW drives then srX devices
> will be created with 2.6 kernels because they actually are SCSI devices. 
 >
$ uname -a
Linux uniq 2.6.15 #1 PREEMPT Tue Jan 3 22:06:09 AST 2006 i686 GNU/Linux
===========^^^^^^ (self-compiled)

$ scsiadd -p
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: YAMAHA   Model: CRW8424S         Rev: 1.0d
  Type:   CD-ROM                           ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 00 Lun: 00
  Vendor: HL-DT-ST Model: DVDRAM GSA-4040B Rev: A300
  Type:   CD-ROM                           ANSI SCSI revision: 02

0,0,0 = (real)SCSI cdrw
1,0,0 = (real)ATAPI dvdrw
I will refrain from providing my (probably superfluous and confusatory) symlinks/devices list, as, due to the sheer damned annoying nature of all this scsi-emu-bullshit, I've been "messing about" with udev.
As of right now, both drives perform as expected, although I've thrown away several sets of "coasters" getting this far, over the last few YEARS.
A decade and a half or so ago, I leapt into solving knotty configuration problems in Linux with exuberant gusto, but, now, <SIGH> I just don't have the resources/energy to spend on bench/spare/testbed boxen. I gave up SysAdmin-Contracting to "spend more time with my Cocoa & Nutmeg Trees". 
:-)
You are still getting scsi emulation because you have it selected in your kernel config. (that option is under ATA/...) 
which device do you write to ?
(there's a reason I ask, I'll elucidate when sober...^hic)};)
I'm running a self-compiled 2.6.8 kernel with which I am able to write to cdroms; it doesn't have any scsi stuff (scsiadd doesn't report anything there) 
Instead it uses the ide-cd module;

HTH,

Joris





--
Ciao 4 now, Greg.
#        |  mailto:unix@spiceisle.com             #
#  --o-o-0-o-o-- Linux and Internet since 1992    #
#  To Live, To Love, To Learn, To Leave A Legacy. #
 AlexJones,NoamChomsky,9/11,Oil,Arms,Drugs,GREED.
Reply to: