I use to setup my PC-BSD main system in a ZFS partition. I guess I've heard many positive opinions about it, while UFS is not familiar to me - remember that I am new in the BSD world!
Anyway, Sysinstaller makes it very easy to install the main system. But how can one add a second (and a third and...) ZFS hard disk in the system? One can use Sysinstaller in the first system installation and create various mountpoints in various disks and format them ZFS and be happy, but this is not nimble: what happens if one disk crashes? Far better is to add disks.
So I tried sysinstall. To format and add an UFS partition (or a whole disk) is easy. But I couldn't change the filesystem. I was never asked during the procedure to chose a filesystem.
Sounds like you want to setup a zpool with raidz / mirroring correct? If
so during the installation you are given the option to add additional
disks to a new ZFS pool, and you can select their type as well,
raidz/mirror. If you want to setup some data partition post-install this
way then you'll probably want to take a look at the "zpool" command, and
maybe the tutorial:
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How to add a second ZFS hard disk?
How to add a second ZFS hard disk?
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