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From: "Steven Hartland" <killing@multiplay.co.uk>
To: "Allan Jude" <allanjude@freebsd.org>,
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Subject: Re: fdisk(8) vs gpart(8), and gnop
Date: Sun, 1 Jun 2014 17:13:33 +0100
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----- Original Message ----- 
From: "Allan Jude" <allanjude@freebsd.org>
>> Does anyone have any objections to me changing this default, right now,
>> today?
>
> The only other downside to 4k sectors is that you only get a history of
> 32 transaction groups instead of 128. Matt Ahrens says this isn't a big
> deal.
> 
> I agree with changing the default to 12, a user making a new pool with
> 512b disks that is that worried about performance, can always shift the
> value back to 9.
> 
> I will add this to the zfs section of the handbook, and make a specific
> note about this 512b issue.
> 
> The 18,000 word ZFS section of the handbook should go live within a week
> or two.

Theres quite a bit more to it than that, see my previous post.

    Regards
    Steve