Gavin McCullagh wrote:
> Hi,
>
> On Sat, 18 Jul 2009, Bruno Friedmann wrote:
>
>> Some time ago, I've made some tests on a customer site.
>> They have plenty data that could be compressed ( a 75% ratio )
>>
>> With GZIP ( which is equal to gzip default level 6 ) we loose hours of
>> compression to obtain finally only a 78% ratio
>> compared to the gzip2 I actually use.
>
> Just so I understand, are you're saying you get 78% compression with gzip6,
> but
> 75% of your data is compressible or 75% compression is possible. Where
> does the 75% come from?
Most of the data are compressible ( exchange server storage, and Navision
Database ) at a 75% rate with gzip2
we have 78% with gzip6 but it double easyly the time need to obtain it. So
sometime it doesn't help to try to do big compression.
Is it more clear ?
>
>> Waht would be cool is to have multi-threaded bacula-fd using lzma
>> compression :-))
>
> Another useful feature might be a wildcard "excludefromcompression"
> directive so you could say:
>
> excludefromcompression {
> pattern = *.zip
> pattern = *.gz
> pattern = *.mp3
> pattern = *.mpeg
> pattern = *.flv
> }
>
> This might avoid wasting time trying to compress the unccompressible while
> gaining the compression ratio on those files which gain from it?
Wouah, that would be nice, is this already working with recent bacula version ?
>
> On the other hand, perhaps it would complicate the job or the volume layout
> too much to mix compressed with uncompressed data?
>
> Gavin
>
Raah your last comment tend to me to believe, bacula should be capable of
excluding from compression.
If it's not already asked, could you put a request for enhancement be sure I
will vote to it.
>
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