On Jan 20, 2011, at 11:01 AM, John Drescher wrote:

>>> This is normal. If you want fast compression do not use software
>>> compression and use a tape drive with HW compression like LTO drives.
>>> 
>>> John
>> Not really an option for file/disk devices though.
>> 
>> I've been tempted to experiment with BTRFS using LZO or standard zlib
>> compression for storing the volumes and see how the performance compares
>> to having bacula-fd do the compression before sending - I have a
>> suspicion the former might be better..
>> 
> 
> Doing the compression at the filesystem level is an idea I have wanted
> to try for several years. Hopefully one of the filesystems that
> support this becomes stable soon.

I've been using ZFS with a compression-enabled fileset for a while now under 
FreeBSD.  It is transparent and reliable.  Looking just now, I'm not getting 
great compression ratios for my backup data: 1.09x.  I am using the 
speed-oriented compression algorithm on this fileset, though, because the 
hardware is relatively puny.  (It is a Bacula test bed.)  Probably I'd get 
better compression if I enabled one of the GZIP levels.

Cheers,

Paul.



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