diff --git a/systemtests/tests/multiplied-device/testrunner b/systemtests/tests/multiplied-device/testrunner
index 0ddba2d92c7..9cb0bcb0b09 100755
--- a/systemtests/tests/multiplied-device/testrunner
+++ b/systemtests/tests/multiplied-device/testrunner
@@ -106,9 +106,9 @@ fi
 
 
 #make sure all volumes are correctly truncated with the correct drive
-grep "3000 OK label. VolBytes=223 Volume=\"Full-0001\" Device=\"MultiFileStorage0001\" (storage)" "${tmp}"/log3.out >/dev/null 2>&1 &&
-grep "3000 OK label. VolBytes=223 Volume=\"Full-0002\" Device=\"MultiFileStorage0002\" (storage)" "${tmp}"/log3.out >/dev/null 2>&1 &&
-grep "3000 OK label. VolBytes=223 Volume=\"Full-0003\" Device=\"MultiFileStorage0003\" (storage)" "${tmp}"/log3.out >/dev/null 2>&1 &&
+grep "3000 OK label. VolBytes=... Volume=\"Full-0001\" Device=\"MultiFileStorage0001\" (storage)" "${tmp}"/log3.out >/dev/null 2>&1 &&
+grep "3000 OK label. VolBytes=... Volume=\"Full-0002\" Device=\"MultiFileStorage0002\" (storage)" "${tmp}"/log3.out >/dev/null 2>&1 &&
+grep "3000 OK label. VolBytes=... Volume=\"Full-0003\" Device=\"MultiFileStorage0003\" (storage)" "${tmp}"/log3.out >/dev/null 2>&1 &&
 grep "The volume 'Full-0001' has been truncated." "${tmp}"/log3.out >/dev/null 2>&1 &&
 grep "The volume 'Full-0002' has been truncated." "${tmp}"/log3.out >/dev/null 2>&1 &&
 grep "The volume 'Full-0003' has been truncated." "${tmp}"/log3.out >/dev/null 2>&1
@@ -117,4 +117,12 @@ if test $? -ne 0 ; then
   estat=1;
 fi
 
+# make sure the devices really have been truncated
+for i in 1 2 3; do
+  size=$(wc -c < "storage/Full-000${i}")
+  if [ "$size" -ge 300 ]; then
+    echo "file storage/Full-000$i" was not truncated
+    estat=3
+  fi
+done
 end_test