[nflug] CD/DVD drives not working in linux

[Robert F. Stockdale IV]

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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