I thought I would ask a question that I seem to be getting different answers on when I search online about ZFS and Raid-Z
First from my understand ZFS is a filesystem and offers not true backup unless you do a mirror or a raid. (if this is incorrect please point me to an article that shows otherwise).
Am I correct in saying Raid-Z using ZFS cannot be grown horizontally (by adding disks). But it can be grown by replacing the disks with larger disks one at a time.
I ask because I'm looking into building a media server and have been looking at some free options rather then going the WHS route. But I would want something that I can add drives to as I have extra funds to purchase them and also be able to take advantage of the larger drives that come out.
Right now WHS is in the front running for a few reasons one is the ease of use and the fact that I can just keep adding drives. But it seems like I could do most of this with a free OS such as Solaris or Freenas (although I wish they would include a final build with ZFS and Raidz rather then nightly builds).
I would be serving everything to a PS3 and I would want to store HD movies. I would also store all sorts of different files formats between my wife and I.
Please correct anything I may have said and if I am incorrect please post a link as I have little faith in someone saying I did it without any direction how.