The software (bacula in this case) is not involved with managing the keys
in hardware encryption.  It is managed by other software or by the tape
library itself.  I came from a Networker environment using LTO-4 and
encryption.  In that specific case, Quantum has their own key manager (a
relabel of IBM's key management software) that does all of the key
management conversation with the tape drives.  Networker is blissfully
unaware of any of it.  I am now working on an installation with a Spectra
Logic library and LTO-5 media.  The library itself does the key
management.  Again, any backup software that I use will have no idea if
the encryption is being used or not.  In fact, simple *nix tar commands
writing to a tape drive that is using HW encryption will indeed have an
encrypted media.

Patti 


On 3/7/12 6:12 AM, "Martin Simmons" <martin AT lispworks DOT com> wrote:

>How does the software specify the encryption key?  I read that it needs
>specific SCSI commands, which Bacula doesn't send.
>
>__Martin
>
>
>>>>>> On Tue, 6 Mar 2012 14:12:47 -0500, Clark, Patricia A said:
>> 
>> Why would bacula care about hardware LTO encryption?  It's transparent
>>to
>> the software.
>> 
>> Patti Clark
>> Sr. Linux System Administrator
>> 
>> 
>> 
>> On 3/6/12 10:14 AM, "Jeremy Maes" <jma AT schaubroeck DOT be> wrote:
>> 
>> >Op 5/03/2012 22:37, Alan Brown schreef:
>> >> On 05/03/12 19:51, Alex Crow wrote:
>> >>
>> >>> Thanks Alan,
>> >>>
>> >>> I am specifically addressing the encryption support within Bacula:
>> >>>
>> >>> http://www.bacula.org/en/dev-manual/main/main/Data_Encryption.html
>> >> Openssl compresses _if_ compiled with zlib (it usually is)
>> >>
>> >> It's not hard to test, write to a file instead of tape media and
>>compare
>> >> size vs a tarball.
>> >>
>> >> If you are using a LTO device with built-in encryption then it's much
>> >> faster as there is a dedicated engine for the task (LTO encryption is
>> >> portable across drives as long as the key is retained)
>> >Except for the fact that bacula doesn't support hardware LTO
>>encryption...
>> >> On that basis I'd only use bacula encryption for disk-based backups
>>or
>> >> on tape devices without builtin encyption.
>> >Regards,
>> >Jeremy
>> 
>> 
>> 
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