spa_vdev_remove
error = spa_vdev_remove(spa, guid, B_FALSE);
error = spa_vdev_remove(spa, guid, B_FALSE);
error = spa_vdev_remove(spa, guid, B_FALSE);
(void) spa_vdev_remove(spa, unspare_guid, B_TRUE);
(void) spa_vdev_remove(altspa, unspare_guid, B_TRUE);
extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare);
extern int spa_vdev_remove(spa_t *, uint64_t, boolean_t);
error = spa_vdev_remove(spa, zc->zc_guid, B_FALSE);