On 2015-11-09 09:35 AM, John Drescher wrote:
> On Mon, Nov 9, 2015 at 12:26 PM, jstacey <bacula-forum AT backupcentral DOT 
> com> wrote:
>> I recently enabled encryption in my bacula-fd.conf with these entries:
>>
>>    PKI Signatures = Yes
>>    PKI Encryption = Yes
>>    PKI Keypair = "/etc/bacula/client.pem"
>>    PKI Master Key = "/etc/bacula/master.cert"
>>
>> The encryption works but now my LTO4 tapes can only store around 812MB 
>> instead of the usual 1.2 -> 1.4 TB  Is this normal?  I might enable gzip 
>> software compression but this is going to take a chunk out of my CPU. I read 
>> that it is also possible to enable hardware encryption on the drive. Maybe 
>> this method would allow me to keep using hardware compression? Thanks
>>
>
> Perhaps the software encryption is not very compressible. Remember
> some encryption methods make your data look more random. And random
> data does not compress at all.
>
> John
>
Encrypted data is generally not compressible.  You need to get the 
compression happening before the encryption; this can either be done by 
using software compression as well as software encryption in Bacula or 
by getting the LTO4 features working for you.

Bryn

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