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

[Matej Žerovnik]

You can’t do that, but you can force system to recognize hard drive as if it was 4Kn. Just like we do it for SSDs: http://wiki.illumos.org/display/illumos/List+of+sd-config-list+entries+for+Advanced-Format+drives

lp, Matej


> On 21 Mar 2016, at 06:00, Fred Liu <Fred_Liu at issi.com> wrote:
> 
> 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 <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 <mailto: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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