Hi Paul, * Can you test dd performance with only write-behind translator (along with protocol/client) in client volume configuration? * Also can you add "debug/trace" translator above and below write-behind, start glusterfs with Log-level trace and send the log files? regards, On Sat, Mar 27, 2010 at 5:01 PM, Paul K?lle <pkoelle at gmail.com> wrote: > On Fri, Mar 26, 2010 at 7:35 PM, Vikas Gorur <vikas at gluster.com> wrote: > > > > On Mar 26, 2010, at 4:48 AM, Olivier Le Cam wrote: > > > >> Ooops, I have cc the wrong command on the Ubuntu server. Please correct: > >> > >> > ubuntu:# dd if=/gl_nunki/file_test of=/dev/null > >> > 524288+0 records in > >> > 524288+0 records out > >> > 268435456 bytes (268 MB) copied, 3,15924 s, 85,0 MB/s > >> > >> with: > >> > >> # dd if=/dev/zero of=/mnt/file_test count=262144 bs=1024 > >> 262144+0 records in > >> 262144+0 records out > >> 268435456 bytes (268 MB) copied, 5,56942 s, 48,2 MB/s > > > > > > Please try both these commands with the same block size. Also, be aware > > that GlusterFS performance goes down as the block size decreases. > > Hmm, if I read this right, there is no difference in blocksize: > > (Olivier) Ubuntu (corrected): > # dd if=/dev/zero of=/mnt/file_test count=262144 bs=1024 > 262144+0 records in > 262144+0 records out > 268435456 bytes (268 MB) copied, 5,56942 s, 48,2 MB/s > > (Olivier) Lenny: > lenny:# dd if=/dev/zero of=/mnt/file_test count=262144 bs=1024 > 262144+0 enregistrements lus > 262144+0 enregistrements ??crits > 268435456 bytes (268 MB) copied, 82,408 s, 3,3 MB/s > > (mine) Lenny, 3.0.2: > # dd if=/dev/zero of=/tmp/gluster_mount/file_test count=262144 bs=1024 > 262144+0 records in > 262144+0 records out > 268435456 bytes (268 MB) copied, 6.54638 s, 41.0 MB/s > > Im still on kernel 2.6.18 though... > > cheers > Paul > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users > -- Raghavendra G
