You cannot add 1 drive at a time to a raid-z or raid-2z. You need to add the same number of disks that were used per stripe.. So, if you start with 5 disks, you would have to add 5 more in the future to add disk space. There is also a method of swapping each disk one at a time with a larger disk and performing a scrub inbetween each replacement to increase the pool size.
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