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Subject: Re: Trying to clone a ZFS drive, can't get ashift=12
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From: Dimitry Andric <dim@FreeBSD.org>
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Date: Wed, 1 Apr 2015 07:54:19 +0200
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To: Daniel Eischen <deischen@freebsd.org>
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On 01 Apr 2015, at 06:30, Daniel Eischen <deischen@FreeBSD.org> wrote:
> 
> I have an Oracle (nee Sun) X4-2 server with identical 300GB SAS
> drives.  I did an MBR ZFS install from FreeBSD 10.1-RELEASE CD
> and have it updated to p6:
...
>  # zpool create -o cachefile=/tmp/newpool.cache bootpoolNew label/boot0
>  # zdb -U /tmp/newpool.cache | grep ashift
>              ashift: 9
> 
> What gives?  How do I get it to use 4k?

sysctl vfs.zfs.min_auto_ashift=12

And also put that in your /etc/sysctl.conf.  I don't know why it isn't
the default yet... :)

-Dimitry


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