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Subject: Re: vfs.zfs.min_auto_ashift and OpenZFS
To: freebsd-current@freebsd.org
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From: Ryan Moeller <freqlabs@FreeBSD.org>
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Date: Wed, 9 Sep 2020 17:46:46 -0400
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On 9/9/20 5:40 PM, Slawa Olhovchenkov wrote:
> On Wed, Sep 09, 2020 at 11:55:14AM -0400, Ryan Moeller wrote:
>
>> On 9/8/20 4:31 PM, Niclas Zeising wrote:
>>> On 2020-05-02 02:20, Matthew Macy wrote:
>>>> OpenZFS doesn't have the same ashift optimization logic that FreeBSD
>>>> has. It's something that needs to be resolved before the code can be
>>>> integrated downstream.
>>> So currently all pools created with OpenZFS will use 512 bit
>>> alignment, at least if the underlying storage device uses 512bit
>>> sectors (which most drives tend to do)?
>>>
>>> If this is the case, it feels like a pessimisation.
>>>
>>> Regards
>>
>> The vdev ashift optimizations from FreeBSD were put in OpenZFS before
>> the import into base. That sysctl does work now.
> Ugly hack w/ geom_noop required again?


I believe you can do `-o ashift=` with zpool create/add now.


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