This isn't strictly correct "The only way to expand your ZFS pool is by adding a new VDEV into it" and it is the reason I primarily run RAID 1 mirrors. If you r

This isn't strictly correct "The only way to expand your ZFS pool is by adding a new VDEV into it" and it is the reason I primarily run RAID 1 mirrors. If you run out of space, you swap out the disks one at a time, wait for the drives to sync and then expand the pool.