vfs.zfs.min_auto_ashift and OpenZFS

Slawa Olhovchenkov slw at zxy.spb.ru
Wed Sep 9 21:40:17 UTC 2020


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?


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