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

Saso Kiselkov skiselkov.ml at gmail.com
Mon Sep 14 19:08:30 UTC 2015

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    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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