[Sheepdog] speed test

[MORITA Kazutaka]

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