[nflug] CD/DVD drives not working in linux

[Cyber Source]

Robert F. Stockdale IV wrote:
> If it was a termination problem how could lsscsi report what drives 
> are on the scsi channel? Don't termination problems prevent the whole 
> daisy chain from operating?
> Bob
>
> David J. Andruczyk wrote:
>>
>> --- "Robert F. Stockdale IV" <javabob at adelphia.net> wrote:
>>
>>
>>> Thanks Dave:
>>>     Unfortunately it didn't work. Actually I had it that way before. I
>>> emerged lsscsi and it shows:
>>> java bob # lsscsi
>>> [0:0:1:0]    cd/dvd  PIONEER  DVD-ROM DVD-303  1.09  /dev/sr0
>>> [0:0:4:0]    cd/dvd  YAMAHA   CRW-F1S          1.0c  /dev/sr1
>>> [1:0:0:0]    cd/dvd  DVDRW    DRW-3S163        BSG2  /dev/sr2
>>> [2:0:0:0]    disk    SEAGATE  ST336607LW       0006  /dev/sda
>>> [2:0:1:0]    disk    SEAGATE  ST336607LW       0006  /dev/sdb
>>> [2:0:2:0]    disk    SEAGATE  ST336607LW       0006  /dev/sdc
>>>
>>> The lsmod command you gave me shows:
>>> java bob # lsmod |grep sr_mod
>>> sr_mod                 15268  3
>>> cdrom                  38560  1 sr_mod
>>>
>>>
>>> Finally, I ran dmesg and it revealed /dev/sr1 having an ioctl error.
>>> In fact the tail on it looks like:
>>>
>>> sr1: CDROM (ioctl) error, command: <6>cdb[0]=0x0 00 00 00 00 00 00
>>> sr: Current: sense key=0x3
>>>     ASC=0x57 ASCQ=0x0
>>> sr1: CDROM (ioctl) error, command: <6>cdb[0]=0x0 00 00 00 00 00 00
>>> sr: Current: sense key=0x3
>>>     ASC=0x57 ASCQ=0x0
>>> sr0: CDROM not ready.  Make sure there is a disc in the drive.
>>> cdrom: open failed.
>>> cdrom: open failed.
>>> scsi1 (0:0): rejecting I/O to offline device
>>>
>>>
>>> So it looks like bus A on my Adaptec 2940UW is giving me problems.
>>> Do you have any other ideas?
>>
>>
>> Sounds like either A. a failed device or SCSI bridge, or B, termination
>> issues. (B is more likely).
>>
>> Which ACARD bridge are you using the 7722, or the 7726?   The 7722 are
>> ONLY for ATAPI (CD/DVD) devices, the 7726 is ONLY for IDE disks.
>>
>>   How is the SCSI bus configured termination wise?  The bus should be
>> terminated ONLY and I mean ONLY at it's ends.  If you have termination
>> enabled at multiple points (aside from the ends) the SCSI bus will have
>> erratic problems or not work at all. (some devices may go offline, or
>> throw errors, whereas others can and may work fine.)
>>
>> Typically the adaptec card will auto-terminate at it's end,  there
>> should be a terminator at the end of the bus.
>>
>>
>>
>> Dave J. Andruczyk
>>
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You should have a look at your controller bios settings <ctrl-a> and see 
if you have bad settings in there, while there, you should also see if 
the devices are being detected properly.
  I would imagine if the termination was not right and these being 
optical drives, you might get away with it to boot to a drive, etc. 
Having a look at the controllers bios should clear that up. Do all the 
devices get detected properly at post?
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