diff --git a/tempest/cmd/javelin.py b/tempest/cmd/javelin.py
index 3c41dd9..4e6d04a 100755
--- a/tempest/cmd/javelin.py
+++ b/tempest/cmd/javelin.py
@@ -20,6 +20,7 @@
 """
 
 import argparse
+import collections
 import datetime
 import os
 import sys
@@ -43,7 +44,7 @@
 
 OPTS = {}
 USERS = {}
-RES = {}
+RES = collections.defaultdict(list)
 
 LOG = None
 
@@ -508,6 +509,9 @@
 
 
 def create_volumes(volumes):
+    if not volumes:
+        return
+    LOG.info("Creating volumes")
     for volume in volumes:
         client = client_for_user(volume['owner'])
 
@@ -630,7 +634,7 @@
     global RES
     get_options()
     setup_logging()
-    RES = load_resources(OPTS.resources)
+    RES.update(load_resources(OPTS.resources))
 
     if OPTS.mode == 'create':
         create_resources()