a lot of changes
diff --git a/wally/suits/io/lat_vs_iops.cfg b/wally/suits/io/lat_vs_iops.cfg
index dbafcbb..16e73e2 100644
--- a/wally/suits/io/lat_vs_iops.cfg
+++ b/wally/suits/io/lat_vs_iops.cfg
@@ -1,15 +1,13 @@
 [global]
 include defaults.cfg
 
-TEST_FILE_SIZE=100G
-size={TEST_FILE_SIZE}
-
 ramp_time=5
 runtime=30
 
 blocksize=4k
 rw=randwrite
 sync=1
+direct=1
 
 # ---------------------------------------------------------------------
 # latency as function from IOPS