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OpenZFS founding developer Matthew Ahrens opened a PR for one of the most sought-after features in ZFS history—RAIDz expansion—last week. The new feature allows a ZFS user to expand the size of a single RAIDz vdev. For example, you can use the new feature to turn a three-disk RAIDz1 into a four, five, or six RAIDz1.OpenZFS is a complex filesystem, and things are necessarily going to get a bit chewy explaining how the feature works. So if you're a ZFS newbie, you may want to refer back to our comprehensive ZFS 101 introduction.
