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Date: Sun, 10 Mar 2013 13:51:17 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Cody Ritts <cr@caltel.com>
Subject: Re: Aligning MBR for ZFS boot help
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On Sun, 10 Mar 2013, Cody Ritts wrote:

> Yeah, just for clarity:
>
>> root@lightning# gpart show da0s1
>> =>       0  39068064  da0s1  BSD  (18G)
>>           0        32         - free -  (16k)
>>          32  39067648      1  freebsd-zfs  (18G)
>>    39067680       384         - free -  (192k)
>
> and
>
>> dd if=/boot/zfsboot of=/dev/da0s1 count=1
>> dd if=/boot/zfsboot of=/dev/da0s1a skip=1 seek=1024
>
> will not boot.

But is that putting zfsboot in the right place?  Try installing zfsboot 
with gpart.