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
