# [OmniOS-discuss] 4kn or 512e with ashift=12

Geoff Nordli geoffn at gnaa.net
Mon Mar 21 02:59:19 UTC 2016

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    Hi Fred.

    Definitely, the ashift parameter has been around on the illumos for a
    couple of years.

    thanks,

    Geoff

    On 16-03-20 05:21 PM, Fred Liu wrote:
    > The ashift parameter doesn't apply in illumos if my memory serves me
    > well. It was introduced by ZoL.
    >
    > Thanks.
    >
    > Fred
    >
    >
    >
    >
    >
    >
    >
    > On Sun, Mar 20, 2016 at 1:37 PM -0700, "Geoff Nordli" <geoffn at gnaa.net
    > <mailto:geoffn at gnaa.net>> wrote:
    >
    > Quick, question.
    >
    > Any performance differences between 4Kn and 512e with ashift=12?
    >
    > I am thinking there should not be, since they will both write the full
    > 4K block size.
    >
    > The workload will be virtual machines using a zvol.
    >
    > thanks,
    >
    > Geoff
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