I'd thought that being able to use different-sized drives was a selling point, for piecemeal upgrades, but the article says to never mix sizes across vdevs or spools.
You can upgrade the capacity of a pool, but you have to upgrade each drive, one at a time, with time to resilver in between, and the bigger capacity doesn't come online until all drives are incorporated.
You can upgrade the capacity of a pool, but you have to upgrade each drive, one at a time, with time to resilver in between, and the bigger capacity doesn't come online until all drives are incorporated.