pre-release bug fixes
diff --git a/tests/io_scenario_check_vm_count_ec2.cfg b/tests/io_scenario_check_vm_count_ec2.cfg
new file mode 100644
index 0000000..19c9e50
--- /dev/null
+++ b/tests/io_scenario_check_vm_count_ec2.cfg
@@ -0,0 +1,29 @@
+[defaults]
+NUM_ROUNDS=7
+ramp_time=5
+buffered=0
+wait_for_previous
+filename={FILENAME}
+iodepth=1
+size=10Gb
+time_based
+runtime=30
+group_reporting
+rate={BW_LIMIT}
+rate_iops={IOPS_LIMIT}
+
+# ---------------------------------------------------------------------
+# check different thread count. (latency, bw) = func(th_count)
+# ---------------------------------------------------------------------
+[vm_count_{TEST_SUMM} * {NUM_ROUNDS}]
+blocksize={% 4k, 1m %}
+rw={% randwrite, randread %}
+direct=1
+numjobs={% 1, 2, 5, 10, 15, 20, 25, 30, 35, 40 %}
+
+[vm_count_{TEST_SUMM} * {NUM_ROUNDS}]
+blocksize={% 4k, 1m %}
+rw=randwrite
+direct=0
+sync=1
+numjobs={% 1, 2, 5, 10, 15, 20, 25, 30, 35, 40 %}