At Thu, 1 Sep 2011 09:38:05 +0200, Valerio Pachera wrote: > > Hi, I made simple write speed test. > > I have 3 nodes: > > node1 node2 have 1000Mbps network card. > node3 has a fast ethernet (100Mbps). > > On my vm I run > dd if=/dev/zero of=deleteme bs=1M count=512 > > speed avarage is 7,1MB/s. > > I removed node3 from the cluster, because I think it slows down everything. > I waited till the cluster finished to copy the missing chinks, then I > run the same test. > > The speed was 9,1MB/s, so still like a fast ethernet. > > I was also looking atop during the test on node1 and node2: the disk > was never busy more than 70%. > > What do you think about it? > Shouldn't it be faster? I think it should be much faster. How about adding a '-D' option to the sheep command line? It uses an O_DIRECT option for data object I/Os. Thanks, Kazutaka |