That's upgrading the stored formats, not the in-kernel(?) software support for a particular version?

On 30 December 2011 21:56, Aram Hăvărneanu <aram.h@mgk.ro> wrote:
> zpool/zfs upgrade? Yes. Don't recall if I had to reboot
> afterwards.

You don't.

--
Aram Hăvărneanu