zsysd is an Ubuntu daemon for managing ZFS things, not something OpenZFS provides. So if that is the only process spinning, that is probably specific to them.

zsysd is an Ubuntu daemon for managing ZFS things, not something OpenZFS provides. So if that is the only process spinning, that is probably specific to them. (Not that OZFS native encryption doesn't have flaws; I am probably the last person on the planet to pick to argue that point. But I don't know that this is among them.)