ZFS Raidz Expansion Is Awesome but Has a Small Caveat

Owh this is actually really interesting.

> There is still a caveat

> Existing data will be redistributed or rebalanced over all drives, including the freshly added drive. However, the data that was already stored on the vdev will not be restriped after the vdev is expanded. This means that this data is stored with the older, less efficient parity-to-data ratio.