diff --git a/WHATS_NEW b/WHATS_NEW
index 771a3f6f0..f584ca6fd 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.65 - 
 =================================
+  Disallow cluster attr toggling if there are active mirrors or snapshots.
   Use /bin/bash for scripts with bashisms.
   Skip internal lvm devices in scan if ignore suspended devices is requested.
   Do not merge old device cache after we run full scan. (2.02.56)
diff --git a/lib/metadata/metadata-exported.h b/lib/metadata/metadata-exported.h
index 3c5f8a36a..fe3266a88 100644
--- a/lib/metadata/metadata-exported.h
+++ b/lib/metadata/metadata-exported.h
@@ -691,6 +691,7 @@ int lv_remove_mirrors(struct cmd_context *cmd, struct logical_volume *lv,
 
 int is_temporary_mirror_layer(const struct logical_volume *lv);
 struct logical_volume * find_temporary_mirror(const struct logical_volume *lv);
+int lv_is_mirrored(const struct logical_volume *lv);
 uint32_t lv_mirror_count(const struct logical_volume *lv);
 uint32_t adjusted_mirror_region_size(uint32_t extent_size, uint32_t extents,
                                     uint32_t region_size);
diff --git a/lib/metadata/metadata.c b/lib/metadata/metadata.c
index 16d80a2e4..12cb5e41f 100644
--- a/lib/metadata/metadata.c
+++ b/lib/metadata/metadata.c
@@ -1208,8 +1208,19 @@ int vg_set_alloc_policy(struct volume_group *vg, alloc_policy_t alloc)
 int vg_set_clustered(struct volume_group *vg, int clustered)
 {
 	struct lv_list *lvl;
-	if (clustered) {
-		dm_list_iterate_items(lvl, &vg->lvs) {
+
+	/*
+	 * We do not currently support switching the cluster attribute
+	 * on active mirrors or snapshots.
+	 */
+	dm_list_iterate_items(lvl, &vg->lvs) {
+		if (lv_is_mirrored(lvl->lv) && lv_is_active(lvl->lv)) {
+			log_error("Mirror logical volumes must be inactive "
+				  "when changing the cluster attribute.");
+			return 0;
+		}
+
+		if (clustered) {
 			if (lv_is_origin(lvl->lv) || lv_is_cow(lvl->lv)) {
 				log_error("Volume group %s contains snapshots "
 					  "that are not yet supported.",
@@ -1217,6 +1228,13 @@ int vg_set_clustered(struct volume_group *vg, int clustered)
 				return 0;
 			}
 		}
+
+		if ((lv_is_origin(lvl->lv) || lv_is_cow(lvl->lv)) &&
+		    lv_is_active(lvl->lv)) {
+			log_error("Snapshot logical volumes must be inactive "
+				  "when changing the cluster attribute.");
+			return 0;
+		}
 	}
 
 	if (clustered)
diff --git a/lib/metadata/mirror.c b/lib/metadata/mirror.c
index 757c095da..7ea26d5f0 100644
--- a/lib/metadata/mirror.c
+++ b/lib/metadata/mirror.c
@@ -72,6 +72,14 @@ struct logical_volume *find_temporary_mirror(const struct logical_volume *lv)
 	return NULL;
 }
 
+int lv_is_mirrored(const struct logical_volume *lv)
+{
+	if (lv->status & MIRRORED)
+		return 1;
+
+	return 0;
+}
+
 /*
  * Returns the number of mirrors of the LV
  */