OpenZFS 2.3-rc1 Delivers RAIDZ Expansion, Fast Dedup & Direct IO
https://www.phoronix.com/news/OpenZFS-2.3-rc1-Released
"OpenZFS 2.3-rc1 presents RAIDZ expansion support to allow new devices
to be added to an existing RAIDZ pool to increase storage capacity
without inducing any downtime."
看了一下討論只能加不能刪 (啊不是跟以前一樣)，不能改型態，
好像沒想像中的實用就是