Noob question here, but how exactly does the extend volume feature work? I Didn't really understand fully what was in the documentation. Right now I have a 4x3TB ZFS RaidZ2 volume. I have 2 extra 3TB drives that I am considering adding. If I use the "volume to extend" option in volume manager to add these extra 2 drives, is there any performance penalty? Would it be the same as if I had created the initial volume with all 6 drives or is it different? Thank you in advance!