On Mon, Jul 20, 2009 at 10:57 AM, John Drescher<drescherjm AT gmail DOT com>
wrote:
> On Mon, Jul 20, 2009 at 10:37 AM, Victor Hugo dos
> Santos<listas.vhs AT gmail DOT com> wrote:
>> On Fri, Jul 17, 2009 at 6:53 PM, John Drescher<drescherjm AT gmail DOT com>
>> wrote:
>>> On Fri, Jul 17, 2009 at 5:59 PM, Simone S.
>>> Santiago<simone AT magistrainfo.com DOT br> wrote:
>>>> Hey co-workers,
>>>>
>>>> I wonder if it is possible improve the Bacula compression?
>>>> I am using "compression = GZIP" but sometimes it compress only 15% of
>>>> all volume.
>>>>
>>>> Note: My backup is FILE Type.
>>>>
>>> Try:
>>>
>>> compression=GZIP9
>>>
>>> http://www.bacula.org/en/rel-manual/Configuring_Director.html#SECTION001470000000000000000
>>>
>>> Note that this will take much longer to compress however.
>>
>>
>> mmmm.. GZIP9 no represent exactly best compression method..
>>
>> I send one or two mail to list, about this theme and I ran various
>> tests with distinct values to GZIP and basically this are the results:
>>
>>
>> ************************************************
>> Reporte de hoy (con GZIP=5 y 140GB)
>> ====================================================
>> Scheduled time: 17-Mar-2009 04:30:00
>> Start time: 17-Mar-2009 04:51:20
>> End time: 17-Mar-2009 05:44:24
>> Elapsed time: 53 mins 4 secs
>> FD Bytes Written: 18,119,898,810 (18.11 GB)
>> SD Bytes Written: 18,119,923,547 (18.11 GB)
>> Rate: 5690.9 KB/s
>> Software Compression: 87.9 %
>> ====================================================
>>
>>
>> Reporte de ayer (con GZIP=6 y 140GB)
>> ====================================================
>> Scheduled time: 16-Mar-2009 04:30:00
>> Start time: 16-Mar-2009 04:35:28
>> End time: 16-Mar-2009 05:55:55
>> Elapsed time: 1 hour 20 mins 27 secs
>> FD Bytes Written: 17,570,761,480 (17.57 GB)
>> SD Bytes Written: 17,570,786,217 (17.57 GB)
>> Rate: 3640.1 KB/s
>> Software Compression: 88.2 %
>> ====================================================
>>
>>
>> Reporte del domingo pasado (con GZIP=9 y 145GB)
>> ====================================================
>> Scheduled time: 08-Mar-2009 04:30:00
>> Start time: 08-Mar-2009 04:30:27
>> End time: 08-Mar-2009 08:34:00
>> Elapsed time: 4 hours 3 mins 33 secs
>> Priority: 10
>> FD Bytes Written: 18,452,613,999 (18.45 GB)
>> SD Bytes Written: 18,458,242,303 (18.45 GB)
>> Rate: 1262.8 KB/s
>> Software Compression: 88.1 %
>> ====================================================
>> ************************************************
>>
>> well.. as you can see, for me, the GZIP=6 (default) is the bester
>> method...because is more faster and compress better that GZIP9.
>>
>> bye
>>
>
> You are not using the same exact dataset (145GB versus 140GB source
> data ) in both tests so its meaningless that GZIP6 is better than
> GZIP9.
>
Remember every compression method is data dependent otherwise you
could keep compressing data down to a few bytes...
John
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