[Gluster-users] Fwd: Performance + Translators

[Darren Austin]

Can anyone give me some pointers on this please? :)

I'm really needing to get a performance increase out of Gluster, and I can't figure out if things like quick-read are active or not (and if they are, why disabling them makes no difference to performance).

Thanks! :)

Darren.

----- Original Message -----
> [ This didn't seem to come through the first time - sorry if you get
> two copies :) ]
> 
> ----- Forwarded Message -----
> From: "Darren Austin" <darren-lists at widgit.com>
> To: gluster-users-bounces at gluster.org
> Sent: Tuesday, 28 June, 2011 11:05:38 AM
> Subject: Performance + Translators
> 
> Hi,
> I've been measuring the performance of a GlusterFS backed Apache
> instance and noticed some quite concerning performance issues.
> 
> Should the GlusterFS client be hitting BOTH the replicated servers for
> every httpd request that comes in?
> For every request that is made, the client seems to be requesting the
> file from both the replicated servers in the cluster - is this a
> situation which is normal?
> 
> Also, even though the requested file is exactly the same every time,
> Gluster seems to be re-requesting it from the server(s) for every
> httpd request.
> 
> I've read that the quick-read translator is supposed to cache file
> access requests to increase performance, but it doesn't seem to have
> any effect here - but that may be due to a configuration error on my
> part.
> 
> I'm not even sure if the quick-read translator is being enabled - and
> if it has to be enabled in some way on the client?
> I've attached logs from the point of setting up a new volume and
> mounting it from the client - even though the vol file being sent to
> the client contains references to the quick-read translator, I don't
> know if
> it's actually being used - is there some way to tell?
> 
> Also, as a test, I used 'volume set XXX performance.quick-read off',
> and re-mounted from the client. The same performance tests didn't
> change -
> so either the quick-read translator is having no effect, or it's not
> being enabled on the client.
> 
> I'm pretty new to GlusterFS, so can anyone offer some insight into how
> client side translators get enabled/disabled? My impression from the
> documentation is that you set their options using 'volume set' on the
> server, and the client picks them up - but that doesn't seem to be the
> case here.
> 
> Thanks,
> Darren.
> 
> -- Darren Austin - Systems Administrator, Widgit Software.
> Tel: +44 (0)1926 333680. Web: http://www.widgit.com/
> 26 Queen Street, Cubbington, Warwickshire, CV32 7NA.
> 
> 
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-- 
Darren Austin - Systems Administrator, Widgit Software.
Tel: +44 (0)1926 333680.    Web: http://www.widgit.com/
26 Queen Street, Cubbington, Warwickshire, CV32 7NA.