diff --git a/lib/cinder b/lib/cinder
index f0715a4..cd64aaf 100644
--- a/lib/cinder
+++ b/lib/cinder
@@ -93,11 +93,10 @@
         # volume group, create your own volume group called ``stack-volumes`` before
         # invoking ``stack.sh``.
         #
-        # By default, the backing file is 2G in size, and is stored in ``/opt/stack/data``.
+        # By default, the backing file is 5G in size, and is stored in ``/opt/stack/data``.
 
         if ! sudo vgs $VOLUME_GROUP; then
             VOLUME_BACKING_FILE=${VOLUME_BACKING_FILE:-$DATA_DIR/${VOLUME_GROUP}-backing-file}
-            VOLUME_BACKING_FILE_SIZE=${VOLUME_BACKING_FILE_SIZE:-2052M}
             # Only create if the file doesn't already exists
             [[ -f $VOLUME_BACKING_FILE ]] || truncate -s $VOLUME_BACKING_FILE_SIZE $VOLUME_BACKING_FILE
             DEV=`sudo losetup -f --show $VOLUME_BACKING_FILE`