diff --git a/orchestra/contrib/domains/backends.py b/orchestra/contrib/domains/backends.py
index 64de9789..c666ade3 100644
--- a/orchestra/contrib/domains/backends.py
+++ b/orchestra/contrib/domains/backends.py
@@ -98,8 +98,8 @@ class Bind9MasterDomainBackend(ServiceController):
         from orchestra.contrib.orchestration.manager import router
         operation = Operation(backend, domain, Operation.SAVE)
         servers = []
-        for server in router.get_servers(operation):
-            servers.append(server.get_ip())
+        for routes in router.get_routes(operation):
+            servers.append(route.host.get_ip())
         return servers
     
     def get_masters_ips(self, domain):
diff --git a/orchestra/contrib/mailboxes/validators.py b/orchestra/contrib/mailboxes/validators.py
index 88dfce7d..ce547a77 100644
--- a/orchestra/contrib/mailboxes/validators.py
+++ b/orchestra/contrib/mailboxes/validators.py
@@ -51,14 +51,17 @@ def validate_forward(value):
 
 def validate_sieve(value):
     sieve_name = '%s.sieve' % hashlib.md5(value.encode('utf8')).hexdigest()
-    path = os.path.join(settings.MAILBOXES_SIEVETEST_PATH, sieve_name)
-    with open(path, 'w') as f:
+    test_path = os.path.join(settings.MAILBOXES_SIEVETEST_PATH, sieve_name)
+    with open(test_path, 'w') as f:
         f.write(value)
     context = {
         'orchestra_root': paths.get_orchestra_dir()
     }
     sievetest = settings.MAILBOXES_SIEVETEST_BIN_PATH % context
-    test = run(' '.join([sievetest, path, '/dev/null']), silent=True)
+    try:
+        test = run(' '.join([sievetest, test_path, '/dev/null']), silent=True)
+    finally:
+        os.unlink(test_path)
     if test.return_code:
         errors = []
         for line in test.stderr.decode('utf8').splitlines():
diff --git a/orchestra/contrib/orchestration/__init__.py b/orchestra/contrib/orchestration/__init__.py
index c4d3945d..89d0113b 100644
--- a/orchestra/contrib/orchestration/__init__.py
+++ b/orchestra/contrib/orchestration/__init__.py
@@ -21,13 +21,13 @@ class Operation():
         """ set() """
         return hash(self) == hash(operation)
     
-    def __init__(self, backend, instance, action, servers=None):
+    def __init__(self, backend, instance, action, routes=None):
         self.backend = backend
         # instance should maintain any dynamic attribute until backend execution
         # deep copy is prefered over copy otherwise objects will share same atributes (queryset cache)
         self.instance = copy.deepcopy(instance)
         self.action = action
-        self.servers = servers
+        self.routes = routes
     
     @classmethod
     def execute(cls, operations, async=False):
diff --git a/orchestra/contrib/orchestration/management/commands/orchestrate.py b/orchestra/contrib/orchestration/management/commands/orchestrate.py
index 87aa1974..69fc11fc 100644
--- a/orchestra/contrib/orchestration/management/commands/orchestrate.py
+++ b/orchestra/contrib/orchestration/management/commands/orchestrate.py
@@ -4,7 +4,7 @@ from django.apps import apps
 from orchestra.contrib.orchestration import manager, Operation
 from orchestra.contrib.orchestration.models import Server
 from orchestra.contrib.orchestration.backends import ServiceBackend
-from orchestra.utils.python import import_class, OrderedSet
+from orchestra.utils.python import import_class, OrderedSet, AttrDict
 
 
 class Command(BaseCommand):
@@ -53,7 +53,7 @@ class Command(BaseCommand):
         if servers:
             servers = servers.split(',')
             backends = backends.split(',')
-            server_objects = []
+            routes = []
             # Get and create missing Servers
             for server in servers:
                 try:
@@ -62,12 +62,12 @@ class Command(BaseCommand):
                     server = Server(name=server, address=server)
                     server.full_clean()
                     server.save()
-                server_objects.append(server)
+                routes.append(AttrDict(host=server, async=False))
             # Generate operations for the given backend
             for instance in queryset:
                 for backend in backends:
                     backend = import_class(backend)
-                    operations.add(Operation(backend, instance, action, servers=server_objects))
+                    operations.add(Operation(backend, instance, action, routes=routes))
         else:
             for instance in queryset:
                 manager.collect(instance, action, operations=operations, route_cache=route_cache)
@@ -75,9 +75,9 @@ class Command(BaseCommand):
         servers = []
         # Print scripts
         for key, value in scripts.items():
-            server, __ = key
+            route, __ = key
             backend, operations = value
-            servers.append(server.name)
+            servers.append(str(route.host))
             self.stdout.write('# Execute on %s' % server.name)
             for method, commands in backend.scripts:
                 script = '\n'.join(commands)
diff --git a/orchestra/contrib/orchestration/manager.py b/orchestra/contrib/orchestration/manager.py
index b708fa4a..9cc86d70 100644
--- a/orchestra/contrib/orchestration/manager.py
+++ b/orchestra/contrib/orchestration/manager.py
@@ -23,7 +23,8 @@ router = import_class(settings.ORCHESTRATION_ROUTER)
 def as_task(execute, log, operations):
     def wrapper(*args, **kwargs):
         """ send report """
-        # Tasks run on a separate transaction pool (thread), no need to temper with the transaction
+        # Remember that threads have their oun connection poll
+        # No need to EVER temper with the transaction here
         try:
             log = execute(*args, **kwargs)
             if log.state != log.SUCCESS:
@@ -39,7 +40,7 @@ def as_task(execute, log, operations):
             log.save(update_fields=('state', 'stderr'))
             # We don't propagate the exception further to avoid transaction rollback
         finally:
-            # Store the operation
+            # Store and log the operation
             for operation in operations:
                 logger.info("Executed %s" % str(operation))
                 if operation.instance.pk:
@@ -56,13 +57,13 @@ def generate(operations):
     scripts = OrderedDict()
     cache = {}
     block = False
-    # Generate scripts per server+backend
+    # Generate scripts per route+backend
     for operation in operations:
         logger.debug("Queued %s" % str(operation))
-        if operation.servers is None:
-            operation.servers = router.get_servers(operation, cache=cache)
-        for server in operation.servers:
-            key = (server, operation.backend)
+        if operation.routes is None:
+            operation.routes = router.get_routes(operation, cache=cache)
+        for route in operation.routes:
+            key = (route, operation.backend)
             if key not in scripts:
                 backend, operations = (operation.backend(), [operation])
                 scripts[key] = (backend, operations)
@@ -106,16 +107,16 @@ def execute(scripts, block=False, async=False):
     threads_to_join = []
     logs = []
     for key, value in scripts.items():
-        server, __ = key
+        route, __ = key
         backend, operations = value
-        args = (server,)
+        args = (route.host,)
         kwargs = {
-            'async': async or server.async
+            'async': async or route.async
         }
         log = backend.create_log(*args, **kwargs)
         kwargs['log'] = log
         task = as_task(backend.execute, log, operations)
-        logger.debug('%s is going to be executed on %s' % (backend, server))
+        logger.debug('%s is going to be executed on %s' % (backend, route.host))
         if block:
             # Execute one backend at a time, no need for threads
             task(*args, **kwargs)
@@ -123,7 +124,7 @@ def execute(scripts, block=False, async=False):
             task = close_connection(task)
             thread = threading.Thread(target=task, args=args, kwargs=kwargs)
             thread.start()
-            if not server.async:
+            if not route.async:
                 threads_to_join.append(thread)
         logs.append(log)
     [ thread.join() for thread in threads_to_join ]
@@ -182,10 +183,10 @@ def collect(instance, action, **kwargs):
                         if not execute:
                             continue
             operation = Operation(backend_cls, selected, iaction)
-            # Only schedule operations if the router gives servers to execute into
-            servers = router.get_servers(operation, cache=route_cache)
-            if servers:
-                operation.servers = servers
+            # Only schedule operations if the router has execution routes
+            routes = router.get_routes(operation, cache=route_cache)
+            if routes:
+                operation.routes = routes
                 if iaction != Operation.DELETE:
                     # usually we expect to be using last object state,
                     # except when we are deleting it
diff --git a/orchestra/contrib/orchestration/methods.py b/orchestra/contrib/orchestration/methods.py
index aa99cdb5..6141dcb5 100644
--- a/orchestra/contrib/orchestration/methods.py
+++ b/orchestra/contrib/orchestration/methods.py
@@ -33,6 +33,8 @@ def SSH(backend, log, server, cmds, async=False):
     digest = hashlib.md5(bscript).hexdigest()
     path = os.path.join(settings.ORCHESTRATION_TEMP_SCRIPT_DIR, digest)
     remote_path = "%s.remote" % path
+    # Ensure unique local paths for each file because of problems when os.remove(path)
+    path += '@%s' % str(server)
     log.state = log.STARTED
     log.script = '# %s\n%s' % (remote_path, script)
     log.save(update_fields=('script', 'state'))
diff --git a/orchestra/contrib/orchestration/models.py b/orchestra/contrib/orchestration/models.py
index 29db550f..0b79680b 100644
--- a/orchestra/contrib/orchestration/models.py
+++ b/orchestra/contrib/orchestration/models.py
@@ -150,9 +150,8 @@ class Route(models.Model):
     def backend_class(self):
         return ServiceBackend.get_backend(self.backend)
     
-    # TODO rename to get_hosts
     @classmethod
-    def get_servers(cls, operation, **kwargs):
+    def get_routes(cls, operation, **kwargs):
         cache = kwargs.get('cache', {})
         if not cache:
             for route in cls.objects.filter(is_active=True).select_related('host'):
@@ -162,19 +161,18 @@ class Route(models.Model):
                         cache[key].append(route)
                     except KeyError:
                         cache[key] = [route]
-        servers = []
+        routes = []
         backend_cls = operation.backend
         key = (backend_cls.get_name(), operation.action)
         try:
-            routes = cache[key]
+            target_routes = cache[key]
         except KeyError:
             pass
         else:
-            for route in routes:
+            for route in target_routes:
                 if route.matches(operation.instance):
-                    route.host.async = route.async
-                    servers.append(route.host)
-        return servers
+                    routes.append(route)
+        return routes
     
     def clean(self):
         if not self.match:
diff --git a/orchestra/contrib/orchestration/tests/test_route.py b/orchestra/contrib/orchestration/tests/test_route.py
index f8f1f9de..285105ba 100644
--- a/orchestra/contrib/orchestration/tests/test_route.py
+++ b/orchestra/contrib/orchestration/tests/test_route.py
@@ -30,12 +30,12 @@ class RouterTests(BaseTestCase):
         
         route = Route.objects.create(backend=backend, host=self.host, match='True')
         operation = Operation(backend=TestBackend, instance=route, action='save')
-        self.assertEqual(1, len(Route.get_servers(operation)))
+        self.assertEqual(1, len(Route.get_routes(operation)))
 
         route = Route.objects.create(backend=backend, host=self.host1,
                 match='route.backend == "%s"' % TestBackend.get_name())
-        self.assertEqual(2, len(Route.get_servers(operation)))
+        self.assertEqual(2, len(Route.get_routes(operation)))
         
         route = Route.objects.create(backend=backend, host=self.host2,
                 match='route.backend == "something else"')
-        self.assertEqual(2, len(Route.get_servers(operation)))
+        self.assertEqual(2, len(Route.get_routes(operation)))
diff --git a/orchestra/utils/python.py b/orchestra/utils/python.py
index a4493827..4c610e71 100644
--- a/orchestra/utils/python.py
+++ b/orchestra/utils/python.py
@@ -83,6 +83,9 @@ class AttrDict(dict):
     def __init__(self, *args, **kwargs):
         super(AttrDict, self).__init__(*args, **kwargs)
         self.__dict__ = self
+    
+    def __hash__(self):
+        return hash(id(self))
 
 
 class CaptureStdout(list):