diff --git a/rally/instance_test.sh b/rally/instance_test.sh
new file mode 100644
index 0000000..bf7e7a7
--- /dev/null
+++ b/rally/instance_test.sh
@@ -0,0 +1,34 @@
+additive_dd() {
+    sudo sh -c "echo '127.0.0.1 $(hostname)' >> /etc/hosts"
+    sudo mkfs.ext4 /dev/vdb > /dev/null
+    sudo mkdir -p /mnt/volume
+    sudo mount /dev/vdb /mnt/volume
+    
+    write_4k_res=`sudo -u root dd if=/dev/zero of=/mnt/volume/write_4k.dat oflag=direct bs=4k count=262144 2>&1`
+    local write_4k=`echo $write_4k_res |  awk '{print $14}'`
+
+    write_1m_res=`sudo -u root dd if=/dev/zero of=/mnt/volume/write_1m.dat oflag=direct bs=1M count=1024 2>&1`
+    local write_1m=`echo $write_1m_res |  awk '{print $14}'`
+
+    write_1g_res=`sudo -u root dd if=/dev/zero of=/mnt/volume/write_1g.dat oflag=direct bs=1G count=1 2>&1`
+    local write_1g=`echo $write_1g_res |  awk '{print $14}'`
+    cat << EOF
+    {
+      "title": "Write 4k, 1M, 1G file",
+      "description": "description",
+      "chart_plugin": "StackedArea",
+      "data": [
+        ["write_4k", ${write_4k}],
+        ["write_1M", ${write_1m}],
+        ["write_1G", ${write_1g}]]
+    }
+
+EOF
+}
+
+cat << EOF
+{
+  "additive": [$(additive_dd)],
+  "complete": []
+}
+EOF