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

Fred Liu Fred_Liu at issi.com
Mon Mar 21 05:00:13 UTC 2016

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    So, you can “zpool create –o ashift=12” in illumos? I can’t do that in smartos at least….

    From: Geoff Nordli [mailto:geoff.nordli at gmail.com] On Behalf Of Geoff Nordli
    Sent: 星期一, 三月 21, 2016 10:59
    To: Fred Liu; omnios-discuss
    Cc: zfs-discuss at list.zfsonlinux.org
    Subject: Re: [OmniOS-discuss] 4kn or 512e with ashift=12

    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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