# [OmniOS-discuss] Expectations of ZIL iops

Chris Nagele nagele at wildbit.com
Thu Aug 9 18:44:55 EDT 2012

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    We are running our final tests with our servers before we send them
    off to the DC. We have tested various ZIL devices, including Zeusram
    and DDRdrive. I wanted to get some comments on what we should expect
    when it comes to w/s in iostat for the ZIL. I've heard conflicting
    results.

    So far, running dd with 512b and oflag=sync, the most we can get is 8k
    iops on the zil device. I even tried with some SSDs (Crucial M4,
    Vertex 4) and it is the same result. They all cap at about 8k iops.
    The only outlier is the DDRDrive, which hovers around 6.9k iops. To
    rule things out, I tried Nexenta, OmniOS and Solaris 11, all with
    mostly the same result.

    Is this the expected result? Should I be pushing for more? In IRC I
    was told that I should be able to get 12k no problem. And Chris from
    DDR was able to get around 10k iops in a quick test.

    Hoping for some good answers. Thanks everyone.

    -Chris

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