diff --git a/qemu/tests/drive_mirror_powerdown.py b/qemu/tests/drive_mirror_powerdown.py
index c42c7e06f6300f3739373d69aecc5fccb817d868..473bb84be16aeb0f7c7442c78b4d3fe68e16af5a 100644
--- a/qemu/tests/drive_mirror_powerdown.py
+++ b/qemu/tests/drive_mirror_powerdown.py
@@ -37,7 +37,7 @@ class DriveMirrorPowerdown(drive_mirror_stress.DriveMirrorStress):
         params = self.parser_test_args()
         image_file = params.get("image_file")
         target_image = params.get("target_image")
-        cmd = "yes|mv %s %s" % (target_image, image_file)
+        cmd = "mv -f %s %s" % (target_image, image_file)
         error.context("copy target image")
         utils.system(cmd)
         error.context("powerup vm with target image", logging.info)
@@ -47,7 +47,7 @@ class DriveMirrorPowerdown(drive_mirror_stress.DriveMirrorStress):
         params = self.parser_test_args()
         image_file = params.get("image_file")
         super(DriveMirrorPowerdown, self).clean()
-        cmd = "yes|mv %s-bak %s" % (image_file, image_file)
+        cmd = "mv -f %s-bak %s" % (image_file, image_file)
         utils.system(cmd)
 
 def run_drive_mirror_powerdown(test, params, env):
diff --git a/qemu/tests/drive_mirror_stress.py b/qemu/tests/drive_mirror_stress.py
index e850a390d76f579bcbef9aed271c6647640737fc..3177efdefb5541f5c0b241fad778ca6b4e78c326 100644
--- a/qemu/tests/drive_mirror_stress.py
+++ b/qemu/tests/drive_mirror_stress.py
@@ -35,13 +35,13 @@ class DriveMirrorStress(drive_mirror.DriveMirror):
     @error.context_aware
     def load_stress(self):
         """
-        load IO/CPU/Memoery stress in guest;
+        load IO/CPU/Memory stress in guest;
         """
         params = self.parser_test_args()
         self.install_stress_app()
         cmd = params.get("start_cmd")
         session = self.get_session()
-        error.context("lanuch stress app in guest", logging.info)
+        error.context("launch stress app in guest", logging.info)
         session.sendline(cmd)
         logging.info("Command: %s" % cmd)
         runing = utils_misc.wait_for(self.app_runing, first=0.5, timeout=300)