diff --git a/exec/main.c b/exec/main.c
index 62aac284..11cefb4c 100644
--- a/exec/main.c
+++ b/exec/main.c
@@ -1000,6 +1000,8 @@ int main (int argc, char **argv)
 		log_printf (LOGSYS_LEVEL_NOTICE, "Compatibility mode set to whitetank.  Using V1 and V2 of the synchronization engine.\n");
 		sync_register (
 			corosync_sync_callbacks_retrieve,
+			sync_v2_memb_list_determine,
+			sync_v2_memb_list_abort,
 			sync_v2_start);
 
 		sync_v2_init (
diff --git a/exec/sync.c b/exec/sync.c
index 6b086d68..cb3c300b 100644
--- a/exec/sync.c
+++ b/exec/sync.c
@@ -73,6 +73,11 @@ static const struct memb_ring_id *sync_ring_id;
 
 static int (*sync_callbacks_retrieve) (int sync_id, struct sync_callbacks *callack);
 
+static void (*sync_started) (
+	const struct memb_ring_id *ring_id);
+
+static void (*sync_aborted) (void);
+
 static struct sync_callbacks sync_callbacks;
 
 static int sync_processing = 0;
@@ -263,6 +268,11 @@ int sync_register (
 		int sync_id,
 		struct sync_callbacks *callbacks),
 
+	void (*started) (
+		const struct memb_ring_id *ring_id),
+
+	void (*aborted) (void),
+
 	void (*next_start) (
 		const unsigned int *member_list,
 		size_t member_list_entries,
@@ -291,6 +301,8 @@ int sync_register (
 
 	sync_callbacks_retrieve = callbacks_retrieve;
 	sync_next_start = next_start;
+	sync_started = started;
+	sync_aborted = aborted;
 	return (0);
 }
 
@@ -454,10 +466,14 @@ static void sync_confchg_fn (
 	my_member_list_entries = member_list_entries;
 
 	if (sync_processing && sync_callbacks.sync_abort != NULL) {
+		sync_aborted ();
 		sync_callbacks.sync_abort ();
 		sync_callbacks.sync_activate = NULL;
 	}
 
+	sync_started (
+		ring_id);
+
 	sync_primary_callback_fn (
 		member_list,
 		member_list_entries,
diff --git a/exec/sync.h b/exec/sync.h
index 78c4ab67..b6421206 100644
--- a/exec/sync.h
+++ b/exec/sync.h
@@ -55,6 +55,11 @@ int sync_register (
 		int sync_id,
 		struct sync_callbacks *callbacks),
 
+	void (*sync_started) (
+		const struct memb_ring_id *ring_id),
+
+	void (*sync_aborted) (void),
+
 	void (*next_start) (
 		const unsigned int *member_list,
 		size_t member_list_entries,
diff --git a/exec/syncv2.c b/exec/syncv2.c
index 89db1cf3..081b5cbc 100644
--- a/exec/syncv2.c
+++ b/exec/syncv2.c
@@ -65,6 +65,7 @@ LOGSYS_DECLARE_SUBSYS ("SYNCV2");
 
 #define MESSAGE_REQ_SYNC_BARRIER 0
 #define MESSAGE_REQ_SYNC_SERVICE_BUILD 1
+#define MESSAGE_REQ_SYNC_MEMB_DETERMINE 2
 
 enum sync_process_state {
 	INIT,
@@ -96,11 +97,16 @@ struct processor_entry {
 	int received;
 };
 
+struct req_exec_memb_determine_message {
+	coroipc_request_header_t header;
+	struct memb_ring_id ring_id;
+};
+
 struct req_exec_service_build_message {
 	coroipc_request_header_t header;
 	struct memb_ring_id ring_id;
-	int service_list[128];
 	int service_list_entries;
+	int service_list[128];
 };
 
 struct req_exec_barrier_message {
@@ -112,6 +118,14 @@ static enum sync_state my_state = SYNC_BARRIER;
 
 static struct memb_ring_id my_ring_id;
 
+static struct memb_ring_id my_memb_determine_ring_id;
+
+static int my_memb_determine = 0;
+
+static unsigned int my_memb_determine_list[PROCESSOR_COUNT_MAX];
+
+static unsigned int my_memb_determine_list_entries = 0;
+
 static int my_processing_idx = 0;
 
 static hdb_handle_t my_schedwrk_handle;
@@ -229,6 +243,7 @@ static void sync_barrier_handler (unsigned int nodeid, const void *msg)
 	if (barrier_reached) {
 		my_processing_idx += 1;
 		if (my_service_list_entries == my_processing_idx) {
+			my_memb_determine_list_entries = 0;
 			sync_synchronization_completed ();
 		} else {
 			sync_process_enter ();
@@ -238,7 +253,7 @@ static void sync_barrier_handler (unsigned int nodeid, const void *msg)
 
 static void dummy_sync_init (
 	const unsigned int *member_list,
-	unsigned int member_list_entries,
+	size_t member_list_entries,
 	const struct memb_ring_id *ring_id)
 {
 }
@@ -264,6 +279,30 @@ static int service_entry_compare (const void *a, const void *b)
 	return (service_entry_a->service_id > service_entry_b->service_id);
 }
 
+static void sync_memb_determine (unsigned int nodeid, const void *msg)
+{
+	const struct req_exec_memb_determine_message *req_exec_memb_determine_message = msg;
+	int found = 0;
+	int i;
+
+	if (memcmp (&req_exec_memb_determine_message->ring_id,
+		&my_memb_determine_ring_id, sizeof (struct memb_ring_id)) != 0) {
+
+		return;
+	}
+
+	my_memb_determine = 1;
+	for (i = 0; i < my_memb_determine_list_entries; i++) {
+		if (my_memb_determine_list[i] == nodeid) {
+			found = 1;
+		}
+	}
+	if (found == 0) {
+		my_memb_determine_list[my_memb_determine_list_entries] = nodeid;
+		my_memb_determine_list_entries += 1;
+	}
+}
+
 static void sync_service_build_handler (unsigned int nodeid, const void *msg)
 {
 	const struct req_exec_service_build_message *req_exec_service_build_message = msg;
@@ -342,9 +381,32 @@ static void sync_deliver_fn (
 		case MESSAGE_REQ_SYNC_SERVICE_BUILD:
 			sync_service_build_handler (nodeid, msg);
 			break;
+		case MESSAGE_REQ_SYNC_MEMB_DETERMINE:
+			sync_memb_determine (nodeid, msg);
+			break;
 	}
 }
 
+static void memb_determine_message_transmit (void)
+{
+	struct iovec iovec;
+	struct req_exec_memb_determine_message req_exec_memb_determine_message;
+	int res;
+
+	req_exec_memb_determine_message.header.size = sizeof (struct req_exec_memb_determine_message);
+	req_exec_memb_determine_message.header.id = MESSAGE_REQ_SYNC_MEMB_DETERMINE;
+
+	memcpy (&req_exec_memb_determine_message.ring_id,
+		&my_memb_determine_ring_id,
+		sizeof (struct memb_ring_id));
+
+	iovec.iov_base = (char *)&req_exec_memb_determine_message;
+	iovec.iov_len = sizeof (req_exec_memb_determine_message);
+
+	res = totempg_groups_mcast_joined (sync_group_handle,
+		&iovec, 1, TOTEMPG_AGREED);
+}
+
 static void barrier_message_transmit (void)
 {
 	struct iovec iovec;
@@ -397,9 +459,9 @@ static void sync_process_enter (void)
 	/*
 	 * No syncv2 services
 	 */
-assert (my_service_list_entries);
 	if (my_service_list_entries == 0) { 
 		my_state = SYNC_SERVICELIST_BUILD;
+		my_memb_determine_list_entries = 0;
 		sync_synchronization_completed ();
 		return;
 	}
@@ -448,7 +510,8 @@ static int schedwrk_processor (const void *context)
 
 	if (my_service_list[my_processing_idx].state == INIT) {
 		my_service_list[my_processing_idx].state = PROCESS;
-		my_service_list[my_processing_idx].sync_init (my_member_list, my_member_list_entries,
+		my_service_list[my_processing_idx].sync_init (my_member_list,
+			my_member_list_entries,
 			&my_ring_id);
 	}
 	if (my_service_list[my_processing_idx].state == PROCESS) {
@@ -477,7 +540,14 @@ void sync_v2_start (
 {
 	memcpy (&my_ring_id, ring_id, sizeof (struct memb_ring_id));
 
-	sync_servicelist_build_enter (member_list, member_list_entries, ring_id);
+	if (my_memb_determine) {
+		my_memb_determine = 0;
+		sync_servicelist_build_enter (my_memb_determine_list,
+			my_memb_determine_list_entries, ring_id);
+	} else {
+		sync_servicelist_build_enter (member_list, member_list_entries,
+			ring_id);
+	}
 }
 
 void sync_v2_abort (void)
@@ -487,3 +557,16 @@ void sync_v2_abort (void)
 		my_service_list[my_processing_idx].sync_abort ();
 	}
 }
+
+void sync_v2_memb_list_determine (const struct memb_ring_id *ring_id)
+{
+	memcpy (&my_memb_determine_ring_id, ring_id,
+		sizeof (struct memb_ring_id));
+
+	memb_determine_message_transmit ();
+}
+
+void sync_v2_memb_list_abort (void)
+{
+	my_memb_determine_list_entries = 0;
+}
diff --git a/exec/syncv2.h b/exec/syncv2.h
index 13427229..c3836365 100644
--- a/exec/syncv2.h
+++ b/exec/syncv2.h
@@ -50,4 +50,8 @@ extern void sync_v2_start (
 
 extern void sync_v2_abort (void);
 
+extern void sync_v2_memb_list_determine (const struct memb_ring_id *ring_id);
+
+extern void sync_v2_memb_list_abort (void);
+
 #endif /* SYNC_H_DEFINED */