On Feb 9, 2012, at 10:53 PM, Silver Salonen wrote:

> On Thu, 9 Feb 2012 14:58:33 -0500, Paul Mather wrote:
>> On Feb 9, 2012, at 2:21 PM, Steven Schlansker wrote:
>>> On the flip side, compression seems to be a very big win.  I'm 
>>> seeing ratios from 1.7 to 2.5x savings and the CPU usage is claimed to 
>>> be relatively cheap.
>> 
>> 
>> That's what I am seeing, too.  On the fileset I tried to dedup, I'm
>> currently seeing a compressratio of 1.51x, which I'm happy with for
>> that data.  Enabling ZFS compression appears to have negligible
>> overheads, so having turned it on is a big win for me.
> 
> I'll ask just in case - you don't have Bacula FD's compression enabled 
> for these filesets which give these compression ratios, do you?

I do not.  I assume doubly compressing would suck up CPU with little to no 
gain, although I haven't tried.


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