diff --git a/WHATS_NEW b/WHATS_NEW
index ca3cf1120..9bbe92844 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,7 @@
 Version 2.02.02 - 
 ====================================
+  Set block_on_error parameter if available.
+  Add target_version.
   Add details to format1 'Invalid LV in extent map' error message.
   Fix lvscan snapshot full display.
   Bring lvdisplay man page example into line.
diff --git a/lib/activate/activate.c b/lib/activate/activate.c
index 3bb3a3f98..d7de8ea04 100644
--- a/lib/activate/activate.c
+++ b/lib/activate/activate.c
@@ -76,6 +76,11 @@ int driver_version(char *version, size_t size)
 {
 	return 0;
 }
+int target_version(const char *target_name, uint32_t *maj,
+		   uint32_t *min, uint32_t *patchlevel)
+{
+	return 0;
+}
 int target_present(const char *target_name)
 {
 	return 0;
@@ -278,7 +283,8 @@ int driver_version(char *version, size_t size)
 	return dm_driver_version(version, size);
 }
 
-static int _target_present(const char *target_name)
+int target_version(const char *target_name, uint32_t *maj,
+		   uint32_t *min, uint32_t *patchlevel)
 {
 	int r = 0;
 	struct dm_task *dmt;
@@ -301,6 +307,9 @@ static int _target_present(const char *target_name)
 
 		if (!strcmp(target_name, target->name)) {
 			r = 1;
+			*maj = target->version[0];
+			*min = target->version[1];
+			*patchlevel = target->version[2];
 			goto out;
 		}
 
@@ -315,6 +324,7 @@ static int _target_present(const char *target_name)
 
 int target_present(const char *target_name, int use_modprobe)
 {
+	uint32_t maj, min, patchlevel;
 #ifdef MODPROBE_CMD
 	char module[128];
 #endif
@@ -324,7 +334,7 @@ int target_present(const char *target_name, int use_modprobe)
 
 #ifdef MODPROBE_CMD
 	if (use_modprobe) {
-		if (_target_present(target_name))
+		if (target_version(target_name, &maj, &min, &patchlevel))
 			return 1;
 
 		if (lvm_snprintf(module, sizeof(module), "dm-%s", target_name)
@@ -339,7 +349,7 @@ int target_present(const char *target_name, int use_modprobe)
 	}
 #endif
 
-	return _target_present(target_name);
+	return target_version(target_name, &maj, &min, &patchlevel);
 }
 
 /*
@@ -580,7 +590,7 @@ static int _register_dev(struct cmd_context *cmd, struct logical_volume *lv,
 		if (do_reg) {
 			if (seg->segtype->ops->target_register_events)
 				reg = seg->segtype->ops->target_register_events;
-		} else if(seg->setype->ops->target_unregister_events)
+		} else if (seg->segtype->ops->target_unregister_events)
 			reg = seg->segtype->ops->target_unregister_events;
 
 		if (reg)
diff --git a/lib/activate/activate.h b/lib/activate/activate.h
index c05f667da..0a62c322a 100644
--- a/lib/activate/activate.h
+++ b/lib/activate/activate.h
@@ -37,6 +37,8 @@ int library_version(char *version, size_t size);
 int lvm1_present(struct cmd_context *cmd);
 
 int target_present(const char *target_name, int use_modprobe);
+int target_version(const char *target_name, uint32_t *maj,
+                   uint32_t *min, uint32_t *patchlevel);
 
 void activation_exit(void);
 
diff --git a/lib/mirror/mirrored.c b/lib/mirror/mirrored.c
index a45f95bef..5f539bc07 100644
--- a/lib/mirror/mirrored.c
+++ b/lib/mirror/mirrored.c
@@ -27,6 +27,8 @@
 #include "activate.h"
 #include "libdevmapper-event.h"
 
+static int _block_on_error_available = 0;
+
 enum {
 	MIRR_DISABLED,
 	MIRR_RUNNING,
@@ -239,12 +241,10 @@ static int _add_log(struct dev_manager *dm, struct lv_segment *seg,
 		return 0;
 	}
 
-	/* FIXME Only if the kernel supports this 
-	if (!(seg->status & PVMOVE))
+	if (_block_on_error_available && !(seg->status & PVMOVE))
 		log_flags |= DM_BLOCK_ON_ERROR;
-	*/
 
-	return dm_tree_node_add_mirror_target_log(node, region_size, clustered, log_flags, log_dlid, area_count);
+	return dm_tree_node_add_mirror_target_log(node, region_size, clustered, log_dlid, area_count, log_flags);
 }
 
 static int _add_target_line(struct dev_manager *dm, struct dm_pool *mem,
@@ -322,10 +322,27 @@ static int _target_present(void)
 {
 	static int checked = 0;
 	static int present = 0;
+	uint32_t maj, min, patchlevel;
+	unsigned maj2, min2;
+        char vsn[80];
 
-	if (!checked)
+	if (!checked) {
 		present = target_present("mirror", 1);
 
+		/*
+		 * block_on_error available with mirror target >= 1.1
+		 * or with 1.0 in RHEL4U3 driver >= 4.5
+		 */
+
+		if (target_version("mirror", &maj, &min, &patchlevel) &&
+		    maj == 1 && 
+		    (min >= 1 || 
+		     (min == 0 && driver_version(vsn, sizeof(vsn)) &&
+		      sscanf(vsn, "%u.%u", &maj2, &min2) == 2 &&
+		      maj2 >= 4 && min2 >= 5)))	/* RHEL4U3 */
+			_block_on_error_available = 1;
+	}
+
 	checked = 1;
 
 	return present;