{ config, ... }:
{
  # make an LV for the tank.
  #  lvcreate -L 256G xerneas-luks0 --name xerneas-tank-nvme
  #  mkfs.xfs /dev/mapper/xerneas--luks-xerneas--tank--nvme

  fileSystems."/tank/nvme" = {
      device = "/dev/mapper/xerneas--luks-xerneas--tank--nvme";
      fsType = "xfs";
  };
}