The ZFS dump device is used only for debugging problems. In this case, I have decided the risk vs reward is such that I should delete the dump device to make room for other storage.
I am able to disable save-core (copy from dump device to
dumpadm -n, but when I run
zfs destroy rpool/dump, I still get
cannot destroy 'rpool/dump': dataset is busy, indicating that
dumpadm -n was insufficient.
How can I disable and remove this dedicated dump device?