On Mon, 18 Nov 2013 11:02:15 -0500 Martin Boutin <martboutin@xxxxxxxxx> wrote: > I have the md0 raid device formatted as ext3 with a 4k block size, and > stride and stripes correctly chosen to match the raid chunk size, that > is, stride=128,stripe-width=256. What is your stripe cache size? http://peterkieser.com/2009/11/29/raid-mdraid-stripe_cache_size-vs-write-transfer/ > The command line for measuring filesystem read and write speeds was: > > $ dd if=/tmp/diskmnt/filerd.zero of=/dev/null bs=1M count=1000 iflag=direct > $ dd if=/dev/zero of=/tmp/diskmnt/filewr.zero bs=1M count=1000 oflag=direct Try testing with "fdatasync" instead of "direct" here. -- With respect, Roman
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