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Date: Tue, 10 Sep 2013 08:40:54 +0930
From: Shane Ambler <FreeBSD@ShaneWare.Biz>
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To: J David <j.david.lists@gmail.com>
Subject: Re: zfs_enable vs zfs_load in loader.conf (but neither works)
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Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org>,
 freebsd-stable <freebsd-stable@freebsd.org>,
 Darren Pilgrim <list_freebsd@bluerosetech.com>
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On 09/09/2013 21:20, J David wrote:
> On Sun, Sep 8, 2013 at 11:11 PM, Darren Pilgrim
> <list_freebsd@bluerosetech.com> wrote:
>> You can use zfs.root.mountfrom="zfs:data/root" in /boot/loader.conf
>> instead of an fstab entry.
>
> That has been in loader.conf the whole time.
>
>> Mountpoint=legacy is required either way.
>
> It isn't.  There is another machine right next to it running 9.2-RC1
> and it works fine with the mountpoint=/ setting and an empty fstab.
>

I installed 9.0 onto my machine booting from zfs about a year and a half
ago and remember having issues getting it bootable. As I recall
mounpoint=legacy and mountpoint=/ effectively point to two different
filesystems.

Changing the mounpoint after installing hides the / filesystem.

So it isn't so much which mountpoint to use but which mountpoint *was*
used when you installed the system.