Done. https://bugzilla.redhat.com/show_bug.cgi?id=888174 While testing the system, we found 3.3.0 enables stripped-replicated volumes and seems to offer a "right" read behaviour in some tests. Thanks in advance and, please, contact me in case I can offer further help. Best regards, Samuel. On 17 December 2012 16:20, John Mark Walker <johnmark at redhat.com> wrote: > Please file a bug. There might be time to fix read performance before the > 1st beta release. > > -JM > > > ------------------------------ > > Dear folks, > > I've been tried to use replicated stripped volumes with 3.3. > unsuccessfully due to https://bugzilla.redhat.com/show_bug.cgi?id=861423and I then proceed to try 3.4.0qa5. I then find out that the bug was solved > and I could use replicated stripped volume with the new version. Amazingly, > write performance was quite astonishing. > > The problem I'm facing now is in the read process: It's horribly slow. > When I open a file to edit using the gluster native client, it takes a few > seconds and sometimes I got an error refering to file has been modified > while I was editing it. There's a ruby application reading the files and I > got continuously timeout errors. > > I'm using 4 bricks with Centos 6.3 with the following structure: > Type: Striped-Replicate > Volume ID: 23dbb8dd-5cb3-4c71-9702-7c16ee9a3b3b > Status: Started > Number of Bricks: 1 x 2 x 2 = 4 > Transport-type: tcp > Bricks: > Brick1: 10.0.51.31:/gfs > Brick2: 10.0.51.32:/gfs > Brick3: 10.0.51.33:/gfs > Brick4: 10.0.51.34:/gfs > Options Reconfigured: > performance.quick-read: on > performance.io-thread-count: 32 > performance.cache-max-file-size: 128MB > performance.cache-size: 256MB > performance.io-cache: on > cluster.stripe-block-size: 2MB > nfs.disable: on > > I started profiling and found out one node with absurd latency figures. I > stopped the node and the problem moved to another brick: > %-latency Avg-latency Min-Latency Max-Latency No. of > calls Fop > --------- ----------- ----------- ----------- ------------ > ---- > 99.94 551292.41 us 10.00 us 1996709.00 us 361 FINODELK > > Could anyone provide some information how to debug this problem? Currently > the volume is not usable due to the horrible delay. > > Thank you very much in advance, > Samuel. > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://supercolony.gluster.org/mailman/listinfo/gluster-users > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://supercolony.gluster.org/pipermail/gluster-users/attachments/20121218/8df4e8ed/attachment-0001.html>
