On 17/04/2010 10:53, Mickael Lambert wrote:
My mean is about bandwidth. what I see is that if I write
xMb/s to zfs fs then zfs write nearly xMb/s to the pool and that's attended.
This pool write nearly xMb/s to lofi and that's attended.
iostat lofi seems showing xMb/s input attended also.
I am not enough skilled to investigate on what's happening then between
lofi and the zvol but the other pool write 3*xMb/s to the physical drive.
I am not sure if lofi and or the zvol made some kind of
allocate/read/write/read that make the zvol write 2 or more time each
blocks.
I don't think there is a bug it is just a side effect of what happens
because of the "a pool on lofi on zvol in a pool setup" you have.
--
Darren J Moffat
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