Hi Arno,
Thanks very much for your reply.
On 26/06/2008, at 6:02 PM, Arno Lehmann wrote:
>> Attached scsi tape st0 at scsi0, channel 0, id 6, lun 0
>> Attached scsi tape st1 at scsi1, channel 1, id 14, lun 0
>> scsi singledevice 1 1 14 1
>> Vendor: QUANTUM Model: UHDL Rev: 000E
>> Type: Medium Changer ANSI SCSI revision: 02
>
> You have two tape drives attached. For whatever reason, the kernel now
> recognized them in a different order than before (could be because the
> power cut left one of the drives in a state where it needed more time
> to recover).
It's become clear to me that I don't understand how SCSI tape devices
are handled by Linux.
Host: scsi1 Channel: 01 Id: 14 Lun: 00
Vendor: QUANTUM Model: SDLT600 Rev: 2525
Type: Sequential-Access ANSI SCSI revision: 04
Host: scsi1 Channel: 01 Id: 14 Lun: 01
Vendor: QUANTUM Model: UHDL Rev: 000E
Type: Medium Changer ANSI SCSI revision: 02
So the tape drive and the changer are at the same SCSI address. The
above dmesg snippet indicates to me that I should find the tape drive
at st1 or /dev/nst1 yes? But scsi_info will only tell me about the
"ARCHIVE Python" device at /dev/nst0, it claims that /dev/nst1 does
not exist, which worries me. Perhaps it's broken?
As I understand it: Bacula talks to the changer via its generic SCSI
device /dev/sg9, but must talk to the tape via the st driver at /dev/
nst1 (this is what the pre-existing bacula-sd.conf indicated). But
the system claims that /dev/nst1 doesn't exist.
So questions: Is it possible that removing and reloading the st driver
will have the drive detected and the device recreated properly (this
is kernel 2.4.20-8 from RedHat 9)? Can I talk to the tape via /dev/
sg9? Anything else I should try?
Regards,
--
Lucas James BARBUTO
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