On Jul 7, 2011, at 2:13 PM, Martin Simmons wrote:

>>>>>> On Thu, 7 Jul 2011 10:30:36 -0600, James Woodward said:
>> 
>> Hello,
>> 
>> I haven't seen anything about using nsa devices to use over something like
>> an sa device. I did a bit of a search but haven't seen anything that really
>> explains that portion to me.
> 
> http://www.bacula.org/5.0.x-manuals/en/main/main/Storage_Daemon_Configuratio.html#SECTION002030000000000000000
> http://www.bacula.org/5.0.x-manuals/en/problems/problems/Testing_Your_Tape_Drive.html#SECTION00413000000000000000
> 
> Also, all of the examples use non-rewind devices.
> 
> 
>> When I set these up I did see a recommendation to use the pass through
>> devices e.g pass0, pass1, pass2, pass3. I don't remember the specifics but
>> the passthrough devices themselves seemed to be problematic.
> 
> Yes, the passthrough devices shouldn't be used for data transfer.  They should
> be used to control an autochanger robot.


Normally, under FreeBSD, you will have a ch device for your autoloader, which 
you should use instead.  E.g.,

tape# camcontrol devlist
<QUANTUM ULTRIUM 4 2210>           at scbus0 target 8 lun 0 (sa0,pass0)
<QUANTUM UHDL 0075>                at scbus0 target 8 lun 1 (ch0,pass1)
[[...]]


The chio command uses /dev/ch0 by default.

Cheers,

Paul.


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