I am planning on setting up a FreeNAS ZFS pool using two 2 tb drives and two 1tb drives. I would like to have data redundancy somehow. I read this post which seems to suggest my two options are to lose 1tb per 2tb drive using RAIDZ or to use this command (which doubles the space required for data redundancy):
zfs set copies=2 poolname
Is there a better way to handle this and acheive something more like Drobo's Beyond RAID or Netgear's XRAID? Alternately, could I partition each 2tb drive into 1 tb partitions and put both partitions in the pool?