/*
* If this is a replacing or spare vdev, then
- * get the real first child of the vdev.
+ * get the real first child of the vdev: do this
+ * in a loop because replacing and spare vdevs
+ * can be nested.
*/
- if (strcmp(childtype,
+ while (strcmp(childtype,
VDEV_TYPE_REPLACING) == 0 ||
strcmp(childtype, VDEV_TYPE_SPARE) == 0) {
nvlist_t **rchild;