A zpool consists of vdevs (a group of discs). You can create a mirror of your
250GB. And later you can add another group of discs to your zpool, on the fly.
Each group of discs should have redundancy, for instance, mirror, raidz1 or
raidz2. So you can add vdev to a zpool on the fly, but you can not remove a
vdev from a zpool. You can not change a vdev to another configuration. You can
swap each drive in a vdev to a larger.
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