RE: You can't
Pity. Mirrored ZFS boot volumes are a recommended best practice. Missing out on good stuff there. Until this is an option I'll just go back to using Nexenta or EON, which are also freely available and do support this.
RE: Stop trying to...
No. I don't need your permission or approval to ask if/how something can be done. Pretty arrogant of you to try and tell me how I should think. If you knew/understood anything about the history of OSS you'd realize how counter intuitive and self destructive that narrow view actually is.
RE: Questions being repeated...
If that were true my search would have turned it up. And if it does exist and I missed it, you should have linked the information your reply, as I asked. That would have actually been useful.
Since I'm sure you do not represent the community as a whole I will wait patiently for a response from someone else, hopefully with a bit more class and social skill. In the meantime...you, sir, should be quiet and let the adults talk before you drive another new user away from trying/recommending/contributing to FreeNAS.
And this thread has been copied so if you abuse your moderator privileges that will only come back to make you look even more foolish. So how about being helpful instead, hm?