diff --git a/wally/suits/io/ceph.cfg b/wally/suits/io/ceph.cfg
index cc8e411..1352b1e 100644
--- a/wally/suits/io/ceph.cfg
+++ b/wally/suits/io/ceph.cfg
@@ -9,7 +9,7 @@
 NUM_ROUNDS=7
 NUMJOBS={% 1, 5, 10, 15, 20, 30, 40, 80, 120 %}
 
-size=5G
+size=30G
 ramp_time=30
 runtime=60