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List:       bacula-devel
Subject:    Re: [Bacula-devel] tape sequence of operations?
From:       Alan Brown <ajb2 () mssl ! ucl ! ac ! uk>
Date:       2011-01-26 10:20:41
Message-ID: 4D3FF579.2030106 () mssl ! ucl ! ac ! uk
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On 26/01/11 06:50, Kern Sibbald wrote:
>
>> This is done using a "Prevent Media Removal" call?
> The locking and unlocking is done via an ioctl(MTIOCTOP) call with MTLOCK and
> MTUNLOCK.   What the kernel does exactly, I do not know.
>

That should be PMR :)

 >> There have been several threads in the last few years about being unable

>> to remove tapes on various hardware due to PMR being set.
>>
>> When it is unset, is the tape drive status checked to verify the command
>> actually worked?
> No.
>

OK. As a paranoia step, would you mind adding some logic to check this?

If a single drive or single drive changer has a drive latchup, it's 
annoying.
With more than one drive in the robot it can become a show-stopper.





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