conf/example.conf.in                   | 11 +++++++++++
 lib/config/config_settings.h           | 11 +++++++++++
 lib/metadata/mirror.c                  | 10 +++++++---
 test/shell/lvconvert-mirror.sh         |  2 ++
 test/shell/lvconvert-repair-replace.sh |  4 +++-
 test/shell/lvconvert-repair.sh         |  4 +++-
 test/shell/lvconvert-twostep.sh        |  4 +++-
 test/shell/lvcreate-operation.sh       |  4 +++-
 test/shell/snapshots-of-mirrors.sh     |  4 +++-
 test/shell/vgsplit-operation.sh        |  4 +++-
 10 files changed, 49 insertions(+), 9 deletions(-)

diff --git a/conf/example.conf.in b/conf/example.conf.in
index 7e29aaa..0c2d378 100644
--- a/conf/example.conf.in
+++ b/conf/example.conf.in
@@ -897,6 +897,17 @@ global {
 	# 
 	mirror_segtype_default = "@DEFAULT_MIRROR_SEGTYPE@"
 
+	# Configuration option global/support_mirrored_mirror_log.
+	# Enable mirrored 'mirror' log type for testing.
+	#
+	# This type is deprecated to create or convert to but can
+	# be enabled to test that activation of existing mirrored
+	# logs and conversion to disk/core works.
+	#
+	# Not supported for regular operation!
+	#
+	support_mirrored_mirror_log = 0
+
 	# Configuration option global/raid10_segtype_default.
 	# The segment type used by the -i -m combination.
 	# The --type raid10|mirror option overrides this setting.
diff --git a/lib/config/config_settings.h b/lib/config/config_settings.h
index b725343..92ceb04 100644
--- a/lib/config/config_settings.h
+++ b/lib/config/config_settings.h
@@ -961,6 +961,17 @@ cfg(global_mirror_segtype_default_CFG, "mirror_segtype_default", global_CFG_SECT
 	"    fashion in a cluster.\n"
 	"#\n")
 
+cfg(global_support_mirrored_mirror_log_CFG, "support_mirrored_mirror_log", global_CFG_SECTION, 0, CFG_TYPE_BOOL, 0, vsn(2, 3, 2), NULL, 0, NULL,
+	"Configuration option global/support_mirrored_mirror_log.\n"
+	"Enable mirrored 'mirror' log type for testing.\n"
+	"#\n"
+	"This type is deprecated to create or convert to but can\n"
+	"be enabled to test that activation of existing mirrored\n"
+	"logs and conversion to disk/core works.\n"
+	"#\n"
+	"Not supported for regular operation!\n"
+	"\n")
+
 cfg(global_raid10_segtype_default_CFG, "raid10_segtype_default", global_CFG_SECTION, 0, CFG_TYPE_STRING, DEFAULT_RAID10_SEGTYPE, vsn(2, 2, 99), "@DEFAULT_RAID10_SEGTYPE@", 0, NULL,
 	"The segment type used by the -i -m combination.\n"
 	"The --type raid10|mirror option overrides this setting.\n"
diff --git a/lib/metadata/mirror.c b/lib/metadata/mirror.c
index 8b20979..6950546 100644
--- a/lib/metadata/mirror.c
+++ b/lib/metadata/mirror.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
- * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004-2008,2018 Red Hat, Inc. All rights reserved.
  *
  * This file is part of LVM2.
  *
@@ -1908,8 +1908,12 @@ int add_mirror_log(struct cmd_context *cmd, struct logical_volume *lv,
 	}
 
 	if (log_count > 1) {
-		log_err("Log type \"mirrored\" is DEPRECATED. Use RAID1 LV or disk log instead.");
-		return 0;
+		if (find_config_tree_bool(cmd, global_support_mirrored_mirror_log_CFG, NULL))
+			log_warn("Log type \"mirrored\" creation/conversion is not supported for regular operation!");
+		else {
+			log_err("Log type \"mirrored\" is DEPRECATED. Use RAID1 LV or disk log instead.");
+			return 0;
+		}
 	}
 
 	if (!(parallel_areas = build_parallel_areas_from_lv(lv, 0, 0)))
diff --git a/test/shell/lvconvert-mirror.sh b/test/shell/lvconvert-mirror.sh
index 39ba1c5..a422557 100644
--- a/test/shell/lvconvert-mirror.sh
+++ b/test/shell/lvconvert-mirror.sh
@@ -14,6 +14,8 @@
 
 . lib/inittest
 
+aux lvmconf "global/support_mirrored_mirror_log=1"
+
 aux prepare_pvs 5
 get_devs
 
diff --git a/test/shell/lvconvert-repair-replace.sh b/test/shell/lvconvert-repair-replace.sh
index 3d1cd66..cd17e0b 100644
--- a/test/shell/lvconvert-repair-replace.sh
+++ b/test/shell/lvconvert-repair-replace.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright (C) 2008 Red Hat, Inc. All rights reserved.
+# Copyright (C) 2008,2018 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
@@ -14,6 +14,8 @@
 
 . lib/inittest
 
+aux lvmconf "global/support_mirrored_mirror_log=1"
+
 aux prepare_vg 6
 aux lvmconf 'allocation/maximise_cling = 0' \
 	    'allocation/mirror_logs_require_separate_pvs = 1'
diff --git a/test/shell/lvconvert-repair.sh b/test/shell/lvconvert-repair.sh
index 713c00f..06470c4 100644
--- a/test/shell/lvconvert-repair.sh
+++ b/test/shell/lvconvert-repair.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright (C) 2008-2013 Red Hat, Inc. All rights reserved.
+# Copyright (C) 2008-2013,2018 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
@@ -12,6 +12,8 @@
 
 . lib/inittest
 
+aux lvmconf "global/support_mirrored_mirror_log=1"
+
 recreate_vg_()
 {
 	vgremove -ff $vg
diff --git a/test/shell/lvconvert-twostep.sh b/test/shell/lvconvert-twostep.sh
index 4bd499e..7487d51 100644
--- a/test/shell/lvconvert-twostep.sh
+++ b/test/shell/lvconvert-twostep.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright (C) 2010 Red Hat, Inc. All rights reserved.
+# Copyright (C) 2010,2018 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
@@ -14,6 +14,8 @@
 
 . lib/inittest
 
+aux lvmconf "global/support_mirrored_mirror_log=1"
+
 aux prepare_vg 4
 
 lvcreate -aey --type mirror -m 1 --mirrorlog disk --ignoremonitoring -L 1 -n mirror $vg
diff --git a/test/shell/lvcreate-operation.sh b/test/shell/lvcreate-operation.sh
index 3d4cf43..807f176 100644
--- a/test/shell/lvcreate-operation.sh
+++ b/test/shell/lvcreate-operation.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright (C) 2008 Red Hat, Inc. All rights reserved.
+# Copyright (C) 2008,2018 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
@@ -17,6 +17,8 @@ SKIP_WITH_LVMPOLLD=1
 
 . lib/inittest
 
+aux lvmconf "global/support_mirrored_mirror_log=1"
+
 cleanup_lvs() {
 	lvremove -ff $vg
 	(dm_table | not grep $vg) || \
diff --git a/test/shell/snapshots-of-mirrors.sh b/test/shell/snapshots-of-mirrors.sh
index 5ab45dd..1f2c393 100644
--- a/test/shell/snapshots-of-mirrors.sh
+++ b/test/shell/snapshots-of-mirrors.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright (C) 2010 Red Hat, Inc. All rights reserved.
+# Copyright (C) 2010,2018 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
@@ -14,6 +14,8 @@
 
 . lib/inittest
 
+aux lvmconf "global/support_mirrored_mirror_log=1"
+
 aux prepare_vg 4
 
 lvcreate -aey --type mirror -m 1 -L 10M --nosync -n lv $vg
diff --git a/test/shell/vgsplit-operation.sh b/test/shell/vgsplit-operation.sh
index 5927dfa..36b75f5 100644
--- a/test/shell/vgsplit-operation.sh
+++ b/test/shell/vgsplit-operation.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright (C) 2007 Red Hat, Inc. All rights reserved.
+# Copyright (C) 2007,2018 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
@@ -17,6 +17,8 @@ SKIP_WITH_LVMPOLLD=1
 
 . lib/inittest
 
+aux lvmconf "global/support_mirrored_mirror_log=1"
+
 COMM() {
 	LAST_TEST="$*"
 }