I'm planning on building a fileserver on top of opensolaris, using either a raid z1 or z2. Is it possible to later upgrade a disk at a time and immediately have access to the increased storage? Or is the increased storage only available when every device in the raid z upgraded?
Also, how do regular zpools treat devices of different sizes? I've found no certain answers about this. I may have to start out with two drives of different sizes in a zpool without any redundancy at first. I've heard from some that each drive is treated as the size of the smallest disk (both in zpools and raid zs), but the zfs documentation seems to imply otherwise.