diff --git a/wally/suits/io/check_linearity.cfg b/wally/suits/io/check_linearity.cfg
index a75d937..670e8b3 100644
--- a/wally/suits/io/check_linearity.cfg
+++ b/wally/suits/io/check_linearity.cfg
@@ -1,6 +1,9 @@
 [defaults]
 NUM_ROUNDS=7
 
+# this is critical for correct results in multy-node run
+randrepeat=0
+
 ramp_time=5
 buffered=0
 wait_for_previous
@@ -8,6 +11,7 @@
 iodepth=1
 size=10G
 time_based
+ramp_time=5
 runtime=30
 
 # ---------------------------------------------------------------------