diff --git a/tempest/common/utils/linux/remote_client.py b/tempest/common/utils/linux/remote_client.py
index e9ea92a..b7c776b 100644
--- a/tempest/common/utils/linux/remote_client.py
+++ b/tempest/common/utils/linux/remote_client.py
@@ -175,11 +175,6 @@
         cmd = "sudo ip link set {nic} {state}".format(nic=nic, state=state)
         return self.exec_command(cmd)
 
-    def get_pids(self, pr_name):
-        # Get pid(s) of a process/program
-        cmd = "ps -ef | grep %s | grep -v 'grep' | awk {'print $1'}" % pr_name
-        return self.exec_command(cmd).split('\n')
-
     def get_dns_servers(self):
         cmd = 'cat /etc/resolv.conf'
         resolve_file = self.exec_command(cmd).strip().split('\n')
@@ -188,10 +183,6 @@
                        if len(l) and l[0] == 'nameserver']
         return dns_servers
 
-    def send_signal(self, pid, signum):
-        cmd = 'sudo /bin/kill -{sig} {pid}'.format(pid=pid, sig=signum)
-        return self.exec_command(cmd)
-
     def _renew_lease_udhcpc(self, fixed_ip=None):
         """Renews DHCP lease via udhcpc client. """
         file_path = '/var/run/udhcpc.'
@@ -199,7 +190,8 @@
         pid = self.exec_command('cat {path}{nic}.pid'.
                                 format(path=file_path, nic=nic_name))
         pid = pid.strip()
-        self.send_signal(pid, 'USR1')
+        cmd = 'sudo /bin/kill -{sig} {pid}'.format(pid=pid, sig='USR1')
+        self.exec_command(cmd)
 
     def _renew_lease_dhclient(self, fixed_ip=None):
         """Renews DHCP lease via dhclient client. """
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index e5f5f68..ff48abe 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -635,13 +635,14 @@
                                             private_key=private_key)
         if dev_name is not None:
             ssh_client.make_fs(dev_name)
-            ssh_client.mount(dev_name, mount_path)
+            ssh_client.exec_command('sudo mount /dev/%s %s' % (dev_name,
+                                                               mount_path))
         cmd_timestamp = 'sudo sh -c "date > %s/timestamp; sync"' % mount_path
         ssh_client.exec_command(cmd_timestamp)
         timestamp = ssh_client.exec_command('sudo cat %s/timestamp'
                                             % mount_path)
         if dev_name is not None:
-            ssh_client.umount(mount_path)
+            ssh_client.exec_command('sudo umount %s' % mount_path)
         return timestamp
 
     def get_timestamp(self, ip_address, dev_name=None, mount_path='/mnt',
@@ -653,7 +654,7 @@
         timestamp = ssh_client.exec_command('sudo cat %s/timestamp'
                                             % mount_path)
         if dev_name is not None:
-            ssh_client.umount(mount_path)
+            ssh_client.exec_command('sudo umount %s' % mount_path)
         return timestamp
 
     def get_server_ip(self, server):