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.
John
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