[OmniOS-discuss] zfs compression limits write throughput to 100MB/sec

[Doug Hughes]

That does seem to keep performance at much closer to parity. It still seems
about 70-80% of peak vs what I was seeing before, but not that 100MB/sec
bottleneck.


On Mon, Sep 14, 2015 at 3:08 PM, Saso Kiselkov <skiselkov.ml at gmail.com>
wrote:

> On 9/14/15 9:05 PM, Doug Hughes wrote:
> > Probably something for Illumos, but you guys may have seen this or may
> > like to know.
> >
> > I've got a 10g connected Xyratex box running OmniOS, and I noticed that
> > no matter how many streams (1, 2, 3) I only get 100MB/sec write
> > throughput and it just tops out. Even with 1 stream. This is with the
> > default lzjb compression on (fast option).
> >
> > I turned off compression and have 2 streams running now and am getting
> > about 250-600MB/sec in aggregate. Much better!
> >
> > The compress ratio was only 1.02x - 1.03x so it's no great loss on this
> > data. I just thought the 100MB/sec speed limit was interesting.
>
> Try setting compression=lz4. It should perform much, much better than
> lzjb on incompressible data.
>
> --
> Saso
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