Short: Can I share a disk between two separate zpools?
Long: I want a raidz2 array but I can't afford it all at once. My possible solution is to start with two drives. I would create a mirror using only half the capacity of each disk. When I can afford a more drives I would would create a new zpool with a single raidz2 vdev using the new drives and the 50% unused space on the initial disks. I then plan to copy the data from one zpool to the other, delete the zpool containing the mirror and expand the zpool with the raidz2 vdev.
Would this work?
Links and references would be appreciated.