diff --git a/wally/suits/io/rrd.cfg b/wally/suits/io/rrd.cfg
index 86a73c5..27cb1a0 100644
--- a/wally/suits/io/rrd.cfg
+++ b/wally/suits/io/rrd.cfg
@@ -20,15 +20,16 @@
 
 # ---------------------------------------------------------------------
 [test_{TEST_SUMM}]
-blocksize=64m
-rw=randread
-numjobs=1
+blocksize=4k
+rw=randwrite
+sync=1
+numjobs={% 10,50,100 %}
 
 # ---------------------------------------------------------------------
-[test_{TEST_SUMM}]
-blocksize=4m
-rw=write
-numjobs=1
+# [test_{TEST_SUMM}]
+# blocksize=4m
+# rw=write
+# numjobs=1
 
 # ---------------------------------------------------------------------
 # [rws_{TEST_SUMM}]