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. > > > _______________________________________________ Gluster-users mailing > list Gluster-users at gluster.org > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users -- Darren Austin - Systems Administrator, Widgit Software. Tel: +44 (0)1926 333680. Web: http://www.widgit.com/ 26 Queen Street, Cubbington, Warwickshire, CV32 7NA.
