Possible Duplicate:
Start a ZFS RAIDZ zpool with two discs then add a third?
RAID5 / RAIDZ - is it possible to enlarge without losing data?
I'm setting up a home Network Attached Storage using FreeNAS. I was originally looking at a RAID5 solution, but then decided to look into RAIDZ.
Lets say I have 3 2TB disks in a RAIDZ configuration. How much space do I really have to use and how easy is it for me to add another 2TB drive to the array? Do I gain a full 2TB of free space?