diff --git a/test/shell/lvconvert-mirror.sh b/test/shell/lvconvert-mirror.sh
index 7cf498de4..160b086f6 100644
--- a/test/shell/lvconvert-mirror.sh
+++ b/test/shell/lvconvert-mirror.sh
@@ -323,7 +323,7 @@ SHOULD=
 aux throttle_dm_mirror || SHOULD=should
 
 # Use large enough mirror that takes time to sychronize with small regionsize
-lvcreate -aey -L20 -Zn -Wn --type mirror --regionsize 16k -m2 -n $lv1 $vg "$dev1" "$dev2" "$dev4" "$dev3:$DEVRANGE"
+lvcreate -aey -L30 -Zn -Wn --type mirror --regionsize 16k -m2 -n $lv1 $vg "$dev1" "$dev2" "$dev4" "$dev3:$DEVRANGE"
 $SHOULD not lvconvert -m-1 $vg/$lv1 "$dev1" 2>&1 | tee out
 aux restore_dm_mirror
 grep "not in-sync" out
@@ -341,7 +341,7 @@ lvremove -ff $vg
 aux throttle_dm_mirror || :
 # No parallel lvconverts on a single LV please
 # Use big enough mirror size and small regionsize to run on all test machines succesfully
-lvcreate -aey -Zn -Wn -L20 --type mirror --regionsize 16k -m1 -n $lv1 $vg "$dev1" "$dev2" "$dev3:0-8"
+lvcreate -aey -Zn -Wn -L30 --type mirror --regionsize 16k -m1 -n $lv1 $vg "$dev1" "$dev2" "$dev3:0-8"
 check mirror $vg $lv1
 check mirror_legs $vg $lv1 2