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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