I just upgraded from FreeNAS 0.7.2 to NAS4Free 9.1 and have an old ZFS pool imported. Freenas used ZFS v15 and Nas4free is using v28. I would like to wait a bit before upgrading, but have a new disc I would like to plug in before that.
I'm wondering if it's possible to have an old disk with zpool v15 and to configure a new disk to be zpool v28? As I understand upgrading takes place "by pool", so I believe this should be possible?