diff --git a/tobiko/shell/sh/__init__.py b/tobiko/shell/sh/__init__.py
index 2598c735d..3162603d8 100644
--- a/tobiko/shell/sh/__init__.py
+++ b/tobiko/shell/sh/__init__.py
@@ -77,6 +77,7 @@ RebootHostMethod = _reboot.RebootHostMethod
 crash_method = RebootHostMethod.CRASH
 hard_reset_method = RebootHostMethod.HARD
 soft_reset_method = RebootHostMethod.SOFT
+hard_shutdown_method = RebootHostMethod.HARD_SHUTDOWN
 
 ssh_process = _ssh.ssh_process
 ssh_execute = _ssh.ssh_execute
diff --git a/tobiko/shell/sh/_reboot.py b/tobiko/shell/sh/_reboot.py
index 0998c9c9e..e9a850fb9 100644
--- a/tobiko/shell/sh/_reboot.py
+++ b/tobiko/shell/sh/_reboot.py
@@ -32,6 +32,8 @@ class RebootHostMethod(enum.Enum):
     SOFT = '/sbin/reboot',
     HARD = 'echo 1 > /proc/sys/kernel/sysrq && echo b > /proc/sysrq-trigger',
     CRASH = 'echo 1 > /proc/sys/kernel/sysrq && echo c > /proc/sysrq-trigger',
+    HARD_SHUTDOWN = \
+        'echo 1 > /proc/sys/kernel/sysrq && echo o > /proc/sysrq-trigger',
 
     def __init__(self, command: str):
         self.command = command
@@ -53,7 +55,7 @@ def reboot_host(ssh_client: ssh.SSHClientFixture,
                                  timeout=timeout,
                                  method=method)
     tobiko.setup_fixture(reboot)
-    if wait:
+    if method != RebootHostMethod.HARD_SHUTDOWN and wait:
         reboot.wait_for_operation()
     return reboot
 
diff --git a/tobiko/tests/faults/ha/cloud_disruptions.py b/tobiko/tests/faults/ha/cloud_disruptions.py
index 92d8af109..6f67aa8e2 100644
--- a/tobiko/tests/faults/ha/cloud_disruptions.py
+++ b/tobiko/tests/faults/ha/cloud_disruptions.py
@@ -192,6 +192,12 @@ def reboot_all_controller_nodes(reboot_method=sh.hard_reset_method,
             check_overcloud_node_responsive(controller)
 
 
+def hard_power_off_overcloud_nodes(nodes):
+    for node in nodes:
+        sh.reboot_host(ssh_client=node.ssh_client,
+                       method=sh.hard_shutdown_method)
+
+
 def get_main_vip():
     """return the ip of the overcloud main vip.
     Retreive an ip address (ipv4/ipv6) from the auth_url."""
diff --git a/tobiko/tests/faults/ha/test_cloud_recovery.py b/tobiko/tests/faults/ha/test_cloud_recovery.py
index 3981ca344..72c49a838 100644
--- a/tobiko/tests/faults/ha/test_cloud_recovery.py
+++ b/tobiko/tests/faults/ha/test_cloud_recovery.py
@@ -215,7 +215,7 @@ class DisruptTripleoNodesTest(testtools.TestCase):
         cloud_disruptions.request_galera_sst()
         OvercloudHealthCheck.run_after()
 
-    def test_controllers_shutdown(self):
+    def _test_controllers_shutdown(self, shutdown_method):
         all_nodes = topology.list_openstack_nodes(group='controller')
         if len(all_nodes) < 3:
             self.skipTest('It requires at least three controller nodes')
@@ -229,10 +229,10 @@ class DisruptTripleoNodesTest(testtools.TestCase):
         quorum_level = math.ceil(0.5 * len(all_nodes))
         assert quorum_level >= len(all_nodes) - quorum_level
         nodes = random.sample(all_nodes, quorum_level)
+
         LOG.info(f"Power off {quorum_level} random controller nodes: "
                  f"{[node.name for node in nodes]}")
-        for node in nodes:
-            node.power_off_overcloud_node()
+        shutdown_method(nodes)
 
         random.shuffle(nodes)
         LOG.info("Power on controller nodes: "
@@ -245,6 +245,17 @@ class DisruptTripleoNodesTest(testtools.TestCase):
         LOG.info("Verify can create VMs after controllers power on...")
         tests.test_server_creation()
 
+    def test_controllers_shutdown(self):
+
+        def shutdown_nodes(nodes):
+            for node in nodes:
+                node.power_off_overcloud_node()
+
+        self._test_controllers_shutdown(shutdown_nodes)
+
+    def test_controllers_hard_power_down(self):
+        self._test_controllers_shutdown(
+            cloud_disruptions.hard_power_off_overcloud_nodes)
 
 # [..]
 # more tests to follow