[Gluster-users] GlusterFS performance

Joe Landman landman at scalableinformatics.com
Wed Sep 26 21:47:28 UTC 2012

On 09/26/2012 05:28 PM, John Mark Walker wrote:
> On Wed, Sep 26, 2012 at 2:23 PM, Berend de Boer <berend at pobox.com
> <mailto:berend at pobox.com>> wrote:
>      >>>>> "John" == John Mark Walker <johnmark at johnmark.org
>     <mailto:johnmark at johnmark.org>> writes:
>          John> This is different from any other benchmark I've seen. I
>          John> haven't seen that much of a disparity before.
>     What benchmarks? Steve's experience is very similar to what everyone
>     sees when trying out gluster.
> Have you seen write:read ratios > 5:1? I certainly haven't. I have seen
> discrepancies, sure, but not by that much.

I've seen stuff like this.  Looks like a caching issue (gluster client) 
among other things.

Read performance with the gluster client isn't that good, write 
performance (effectively write caching at the brick layer) is pretty good.

I know its a generalization, but this is basically what we see.  In the 
best case scenario, we can tune it pretty hard to get within 50% of 
native speed.  But it takes lots of work to get it to that point, as 
well as an application which streams large IO.  Small IO is a (still) 
bad on the system IMO.

I've not explored the 3.3.x caching behavior (largely turned it off in 
3.2.x and previous due to bugs which impacted behavior).

Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics Inc.
email: landman at scalableinformatics.com
web  : http://scalableinformatics.com
phone: +1 734 786 8423 x121
fax  : +1 866 888 3112
cell : +1 734 612 4615

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