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

[Fred Liu]

So that means illumos can handle 512n and 4kn automatically and properly?

Thanks.

Fred

From: Matej Žerovnik [mailto:matej at zunaj.si]
Sent: 星期一, 三月 21, 2016 14:20
To: Fred Liu
Cc: geoffn at gnaa.net; omnios-discuss; zfs-discuss at list.zfsonlinux.org
Subject: Re: [OmniOS-discuss] 4kn or 512e with ashift=12

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<mailto: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] 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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