On 2/17/2017 04:18, Norbert Gomes wrote:
> Hi list !
>
> GZIP compression is quite slow on our Windows clients (5.2.10), it
> increases a lot the duration of theses backups. The speed of the network
> transfer is at: 20 MB/s with GZIP and 100 MB/s without compression
>
> I read that LZO would be faster, but when I enable it (compression="LZO"
> in the FileSet Include Options), no compression is applied
>
> I'm using the binary on
> https://sourceforge.net/projects/bacula/files/Win32_64/5.2.10/
>
> Is LZO enabled on these program ?
>
>
> And also, have you got some ideas to speed up my backups using
> compression (GZIP1 or GZIP6 gives the same level of performance) ?
>
As far as I know, LZO support for Windows wasn't added until version
7.x, which is only available in the enterprise version (though you can
use that build for personal use now).
I can confirm that it works in 7.0.5, and is considerably faster than
gzip1, and all other compression methods available in Bacula.
A short test on this machine with a 1.6GB database table shows LZO
(lzop.exe with default options, which should be equivalent to what
Bacula does) running more than three times faster than gzip -1.
146MB/sec vs 46MB/sec, or 11.1 seconds vs 35.1 seconds. That's at a
cost of around 10% worth of compression - LZO was 52.5% of the original,
while gzip -1 was 42.9% of the original. And just for comparison, bzip2
-9 ran at 9.5MB/sec for 172.2 seconds, compressing to 38.6% of the
original size.
Something else very much worth doing is to simply disable compression
for file extensions that indicate already-compressed data. Something
like this within the file set definition:
Options
{
Signature = MD5
Wild = *.jpg
Wild = *.png
Wild = *.gif
Wild = *.zip
Wild = *.rar
Wild = *.7z
Wild = *.r??
Wild = *.mpg
Wild = *.wmv
Wild = *.avi
Wild = *.mov
Wild = *.mkv
Wild = *.mp3
Wild = *.mp4
Wild = *.gz
Wild = *.bz2
}
Options
{
Signature = MD5
Compression = LZO
}
That uses LZO for all files that don't match the wildcard specification
in the first option block. Trying to use LZO on something already
compressed, especially something compressed more highly, is going to
accomplish either nothing or worse than nothing (i.e. output larger than
the input).
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