On 11/01/17 15:01, Alan Brown wrote:
> On 11/01/17 05:16, Charles wrote:
>>
>> According to both the man pages and experimentation, Debian Jessie's
>> mt and mtx do not support an unlock command.
>
> Whilst other debian versions do
>
> # mt --version
> mt-st v. 1.3
> default tape device: '/dev/tape'
>
>
>       lock   (SCSI tapes) Lock the tape drive door.
>
>        unlock (SCSI tapes) Unlock the tape drive door.
>
>
> You might want to check the version of MT you have installed.
>
>
> (mt -f /dev/nst0 lock)
>
> Note that lock/unlock will _only_ work if there's a tape in the drive.

Thanks Alan

[email protected]:~# mt -f /dev/st0 lock
mt: invalid argument `lock' for `operation'
Valid arguments are:
   - `eof', `weof'
   - `fsf'
   - `bsf'
   - `fsr'
   - `bsr'
   - `rewind'
   - `offline', `rewoffl', `eject'
   - `status'
   - `bsfm'
   - `eom'
   - `retension'
   - `erase'
   - `asf'
   - `fsfm'
   - `seek'
[email protected]:~# mt --version
mt (GNU cpio) 2.11
...

To be thorough, the bacula-sd init script should not only run the mt 
rewoffl and mtx unload commands; it should also error trap their output. 
  I suspect that, when our autoloader and backup server are powered up 
at the same time, the autoloader does not finish initialising before the 
backup server runs the bacula-sd init script.  In which case the mt and 
mtx commands are ineffective and SD finds a tape in the drive resulting 
in the tape getting Bacula status Error.

More after I have tested error trapping the mt rewoffl and mtx unload 
commands.

Best

Charles


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