more improvements and fixes and new bugs
diff --git a/wally/suits/io/io_scenario_hdd.cfg b/wally/suits/io/io_scenario_hdd.cfg
index 5e24009..46191f2 100644
--- a/wally/suits/io/io_scenario_hdd.cfg
+++ b/wally/suits/io/io_scenario_hdd.cfg
@@ -8,8 +8,8 @@
 filename={FILENAME}
 NUM_ROUNDS=7
 
-ramp_time=5
 size=10Gb
+ramp_time=5
 runtime=30
 
 # ---------------------------------------------------------------------
@@ -39,6 +39,7 @@
 blocksize=1m
 rw={% read, write %}
 direct=1
+offset_increment=1073741824 # 1G
 numjobs={% 1, 5, 10, 15, 20, 30, 40, 80, 120 %}
 
 # ---------------------------------------------------------------------