Comment by wkat4242

5 days ago

Note: This is online expansion. Expansion was always possible but you did need to take the array down to do it. You could also move to bigger drives but you also had to do that one at a time (and only gain the new capacity once all drives were upgraded of course)

As far as I know shrinking a pool is still not possible though. So if you have a pool with 5 drives and add a 6th, you can't go back to 5 drives even if there is very little data in it.