fix config file examples, houskeeping, etc
diff --git a/configs-examples/ceph_raw.yaml b/configs-examples/ceph_raw.yaml
index 646945f..9520a2f 100644
--- a/configs-examples/ceph_raw.yaml
+++ b/configs-examples/ceph_raw.yaml
@@ -1,12 +1,14 @@
+include: default.yaml
+
 clouds:
-    ceph: ssh://USER@ANY_CEPH_NODE::KEY_FILE
+    ceph: ssh://${USER}@${ANY_CEPH_NODE}::${KEY_FILE}
 
 discover: ceph
 
 explicit_nodes:
-    "ssh://TEST_USER@TESTNODE1::KEY_FILE": testnode
-    "ssh://TEST_USER@TESTNODE2::KEY_FILE": testnode
-    "ssh://TEST_USER@TESTNODE3::KEY_FILE": testnode
+    "ssh://${TEST_USER}@${TESTNODE1}::${KEY_FILE}": testnode
+    "ssh://${TEST_USER}@${TESTNODE2}::${KEY_FILE}": testnode
+    "ssh://${TEST_USER}@${TESTNODE3}::${KEY_FILE}": testnode
 
 sensors:
     roles_mapping:
@@ -17,11 +19,5 @@
     - io:
         cfg: ceph
         params:
-            FILENAME: /dev/rbd/rbd/RBD_DEV_NAME_OR_LINK
-            NUM_ROUNDS: 7
-
-internal:
-    var_dir_root: /tmp/perf_tests
-
-logging:
-    extra_logs: 1
+            FILENAME: /dev/rbd/rbd/${RBD_DEV_NAME_OR_LINK}
+            FILESIZE: ${FILESIZE}