N-way mirror read speedup in zfsonlinux

[asomers at gmail.com]

Looks pretty good.  I'll put this on my list of stuff to test in the
next couple of weeks as I start working more on performance.

On Fri, Jul 12, 2013 at 3:21 AM, Martin Matuška <martin at matuska.org> wrote:
> Hi everyone,
>
> zfsonlinux has implemented a change in the N-way mirror device selection
> algorithm by selecting the device with the least pending I/O instead of
> random selection. They measured an increased read bandwidth increase up to
> 50% and IOPS increase up to 10%.
>
> this might be useful for common ZFS code and we might consider porting this
> to illumos and FreeBSD:
> https://github.com/zfsonlinux/zfs/issues/1461
> https://github.com/zfsonlinux/zfs/commit/556011dbec2d10579819078559a77630fc559112
>
> Cheers,
> mm
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