--- /dev/null
+#!/usr/bin/env bash
+
+# Copyright (C) 2019 Red Hat, Inc. All rights reserved.
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions
+# of the GNU General Public License v.2.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+SKIP_WITH_LVMPOLLD=1
+
+. lib/inittest
+
+dd if=/dev/zero of=loopa bs=$((1024*1024)) count=2 2> /dev/null
+dd if=/dev/zero of=loopb bs=$((1024*1024)) count=2 2> /dev/null
+LOOP1=$(losetup -f loopa --sector-size 4096 --show)
+LOOP2=$(losetup -f loopb --show)
+
+echo $LOOP1
+echo $LOOP2
+
+aux extend_filter "a|$LOOP1|"
+aux extend_filter "a|$LOOP2|"
+
+not vgcreate --config 'devices {allow_mixed_block_sizes=0 scan="/dev"}' $vg $LOOP1 $LOOP2
+vgcreate --config 'devices {allow_mixed_block_sizes=1 scan="/dev"}' $vg $LOOP1 $LOOP2
+vgs --config 'devices {allow_mixed_block_sizes=1 scan="/dev"}' $vg
+
+wipefs -a $LOOP1
+wipefs -a $LOOP2
+
+vgcreate --config 'devices {allow_mixed_block_sizes=1 scan="/dev"}' $vg $LOOP1
+vgs --config 'devices {allow_mixed_block_sizes=1 scan="/dev"}' $vg
+not vgextend --config 'devices {allow_mixed_block_sizes=0 scan="/dev"}' $vg $LOOP2
+vgextend --config 'devices {allow_mixed_block_sizes=1 scan="/dev"}' $vg $LOOP2
+
+losetup -d $LOOP1
+losetup -d $LOOP2
+rm loopa
+rm loopb
+