What do you mean? I've done this not so long ago on my pool.
https://unix.stackexchange.com/questions/530968/adding-disks...
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You can't add disks to a vdev, though, which is what most people with a home NAS (including me) want.
You can add them to RAID0/1 vdevs; you can't add them to RAIDZ vdevs. Which you don't have if you don't run ZFS. You might have RAID5, but then you also have a write hole.