Merge "Use system_reader in identity v3 admin tests"
diff --git a/tempest/config.py b/tempest/config.py
index b81e13f..f0ed2ab 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -1060,9 +1060,11 @@
                 help='Disk format to use when copying a volume to image'),
     cfg.IntOpt('volume_size',
                default=1,
+               min=1,
                help='Default size in GB for volumes created by volumes tests'),
     cfg.IntOpt('volume_size_extend',
                default=1,
+               min=1,
                help="Size in GB a volume is extended by - if a test "
                     "extends a volume, the size of the new volume will be "
                     "volume_size + volume_size_extend."),