So I'm testing this out in VirtualBox, and I've got two 10GB drives as a test (mirror of ada1 and ada2, ZFS). I create a zpool/volume called "tank" with the two drives, no problem. Then I power off, remove one drive (ada2) and boot back up. It says "DEGRADED" which is expected. I shut down, add a brand new 10GB HD and boot up again. Using the GUI, I list the disks in the volume and for ada2 I click "Replace" and choose the only option available (in-place). It seems to work, as I go into the shell and type "zpool status" and it says it resilvered it, but it still says DEGRADED even after scrub & clear. Any ideas?