zpool_vdev_attach
if (zpool_vdev_attach(zhp, dev_name, spare_name,
(void) zpool_vdev_attach(zhp, fullpath, path, nvroot, B_TRUE);
ret = zpool_vdev_attach(zhp, old_disk, new_disk, nvroot, replacing);
extern int zpool_vdev_attach(zpool_handle_t *, const char *,