diff --git a/blazar/api/v1/service.py b/blazar/api/v1/service.py
index 48fbd5f3..5d262fdc 100644
--- a/blazar/api/v1/service.py
+++ b/blazar/api/v1/service.py
@@ -16,7 +16,6 @@
 from oslo_log import log as logging
 
 from blazar import context
-from blazar import exceptions
 from blazar.manager import rpcapi as manager_rpcapi
 from blazar import policy
 from blazar.utils import trusts
@@ -67,28 +66,13 @@ class API(object):
 
     @policy.authorize('leases', 'update')
     def update_lease(self, lease_id, data):
-        """Update lease. Only name changing and prolonging may be proceeded.
+        """Update lease.
 
         :param lease_id: ID of the lease in Blazar DB.
         :type lease_id: str
         :param data: New lease characteristics.
         :type data: dict
         """
-        new_name = data.pop('name', None)
-        end_date = data.pop('end_date', None)
-        start_date = data.pop('start_date', None)
-
-        if data:
-            raise exceptions.BlazarException('Only name changing and '
-                                             'dates changing may be '
-                                             'proceeded.')
-        data = {}
-        if new_name:
-            data['name'] = new_name
-        if end_date:
-            data['end_date'] = end_date
-        if start_date:
-            data['start_date'] = start_date
         return self.manager_rpcapi.update_lease(lease_id, data)
 
     @policy.authorize('leases', 'delete')
diff --git a/blazar/api/v1/v1_0.py b/blazar/api/v1/v1_0.py
index 7ac7a44c..b42aed66 100644
--- a/blazar/api/v1/v1_0.py
+++ b/blazar/api/v1/v1_0.py
@@ -50,7 +50,7 @@ def leases_get(lease_id):
 @rest.put('/leases/<lease_id>')
 @validation.check_exists(_api.get_lease, lease_id='lease_id')
 def leases_update(lease_id, data):
-    """Update lease. Only name changing and prolonging may be proceeded."""
+    """Update lease."""
     return api_utils.render(lease=_api.update_lease(lease_id, data))
 
 
diff --git a/blazar/manager/exceptions.py b/blazar/manager/exceptions.py
index 58114e57..97ec0a5e 100644
--- a/blazar/manager/exceptions.py
+++ b/blazar/manager/exceptions.py
@@ -165,3 +165,8 @@ class InvalidRange(exceptions.BlazarException):
     code = 400
     msg_fmt = _('Invalid values for min/max of hosts. '
                 'Max must be equal to or larger than min.')
+
+
+class CantUpdateParameter(exceptions.BlazarException):
+    code = 409
+    msg_fmt = _("%(param)s cannot be updated")
diff --git a/blazar/manager/service.py b/blazar/manager/service.py
index 4d560baf..b393ba9f 100644
--- a/blazar/manager/service.py
+++ b/blazar/manager/service.py
@@ -353,14 +353,26 @@ class ManagerService(service_utils.RPCServer):
                     raise e
 
             # TODO(frossigneux) rollback if an exception is raised
+            reservations = values.get('reservations', [])
             for reservation in (
                     db_api.reservation_get_all_by_lease_id(lease_id)):
-                reservation['start_date'] = values['start_date']
-                reservation['end_date'] = values['end_date']
-                resource_type = reservation['resource_type']
+                v = {}
+                v['start_date'] = values['start_date']
+                v['end_date'] = values['end_date']
+                try:
+                    v.update(filter(lambda x: x['id'] == reservation['id'],
+                                    reservations).pop())
+                except KeyError:
+                    raise exceptions.MissingParameter(param='reservation ID')
+                except IndexError:
+                    pass
+                resource_type = v.get('resource_type',
+                                      reservation['resource_type'])
+                if resource_type != reservation['resource_type']:
+                    raise exceptions.CantUpdateParameter(
+                        param='resource_type')
                 self.plugins[resource_type].update_reservation(
-                    reservation['id'],
-                    reservation)
+                    reservation['id'], v)
 
         event = db_api.event_get_first_sorted_by_filters(
             'lease_id',
@@ -392,6 +404,10 @@ class ManagerService(service_utils.RPCServer):
         self._update_before_end_event(lease, values, notifications,
                                       before_end_date)
 
+        try:
+            del values['reservations']
+        except KeyError:
+            pass
         db_api.lease_update(lease_id, values)
 
         lease = db_api.lease_get(lease_id)
diff --git a/blazar/plugins/oshosts/host_plugin.py b/blazar/plugins/oshosts/host_plugin.py
index 3fb410ac..2e301a18 100644
--- a/blazar/plugins/oshosts/host_plugin.py
+++ b/blazar/plugins/oshosts/host_plugin.py
@@ -110,63 +110,40 @@ class PhysicalHostPlugin(base.BasePlugin, nova.NovaClientWrapper):
         """Update reservation."""
         reservation = db_api.reservation_get(reservation_id)
         lease = db_api.lease_get(reservation['lease_id'])
-        if (values['start_date'] < lease['start_date'] or
-                values['end_date'] > lease['end_date']):
-            allocations = []
-            hosts_in_pool = []
-            for allocation in db_api.host_allocation_get_all_by_values(
-                    reservation_id=reservation_id):
-                full_periods = db_utils.get_full_periods(
-                    allocation['compute_host_id'],
-                    values['start_date'],
-                    values['end_date'],
-                    datetime.timedelta(seconds=1))
-                if lease['start_date'] < values['start_date']:
-                    max_start = values['start_date']
-                else:
-                    max_start = lease['start_date']
-                if lease['end_date'] < values['end_date']:
-                    min_end = lease['end_date']
-                else:
-                    min_end = values['end_date']
-                if not (len(full_periods) == 0 or
-                        (len(full_periods) == 1 and
-                         full_periods[0][0] == max_start and
-                         full_periods[0][1] == min_end)):
-                    allocations.append(allocation)
-            if allocations:
-                if reservation['status'] == 'active':
-                    raise manager_ex.NotEnoughHostsAvailable()
-                host_reservation = db_api.host_reservation_get(
-                    reservation['resource_id'])
-                pool = nova.ReservationPool()
-                hosts_in_pool.extend(pool.get_computehosts(
-                    host_reservation['aggregate_id']))
-                host_ids = self._matching_hosts(
-                    host_reservation['hypervisor_properties'],
-                    host_reservation['resource_properties'],
-                    str(len(allocations)) + '-' + str(len(allocations)),
-                    values['start_date'],
-                    values['end_date'])
-                if not host_ids:
-                    raise manager_ex.NotEnoughHostsAvailable()
-                if hosts_in_pool:
-                    old_hosts = [db_api.host_get(allocation['compute_host_id'])
-                                 for allocation in allocations]
-                    old_hostnames = [old_host['service_name']
-                                     for old_host in old_hosts]
-                    pool.remove_computehost(host_reservation['aggregate_id'],
-                                            old_hostnames)
-                for allocation in allocations:
-                    db_api.host_allocation_destroy(allocation['id'])
-                for host_id in host_ids:
-                    db_api.host_allocation_create(
-                        {'compute_host_id': host_id,
-                         'reservation_id': reservation_id})
-                    if hosts_in_pool:
-                        host = db_api.host_get(host_id)
-                        pool.add_computehost(host_reservation['aggregate_id'],
-                                             host['service_name'])
+
+        if (not filter(lambda x: x in ['min', 'max', 'hypervisor_properties',
+                                       'resource_properties'], values.keys())
+                and values['start_date'] >= lease['start_date']
+                and values['end_date'] <= lease['end_date']):
+            # Nothing to update
+            return
+
+        dates_before = {'start_date': lease['start_date'],
+                        'end_date': lease['end_date']}
+        dates_after = {'start_date': values['start_date'],
+                       'end_date': values['end_date']}
+        host_reservation = db_api.host_reservation_get(
+            reservation['resource_id'])
+        self._update_allocations(dates_before, dates_after, reservation_id,
+                                 reservation['status'], host_reservation,
+                                 values)
+
+        updates = {}
+        if 'min' in values or 'max' in values:
+            count_range = str(values.get(
+                'min', host_reservation['count_range'].split('-')[0])
+            ) + '-' + str(values.get(
+                'max', host_reservation['count_range'].split('-')[1])
+            )
+            updates['count_range'] = count_range
+        if 'hypervisor_properties' in values:
+            updates['hypervisor_properties'] = values.get(
+                'hypervisor_properties')
+        if 'resource_properties' in values:
+            updates['resource_properties'] = values.get(
+                'resource_properties')
+        if updates:
+            db_api.host_reservation_update(host_reservation['id'], updates)
 
     def on_start(self, resource_id):
         """Add the hosts in the pool."""
@@ -433,3 +410,101 @@ class PhysicalHostPlugin(base.BasePlugin, nova.NovaClientWrapper):
             values['before_end'] = 'default'
         if values['before_end'] not in before_end_options:
             raise manager_ex.MalformedParameter(param='before_end')
+
+    def _update_allocations(self, dates_before, dates_after, reservation_id,
+                            reservation_status, host_reservation, values):
+        min_hosts = self._convert_int_param(values.get(
+            'min', host_reservation['count_range'].split('-')[0]), 'min')
+        max_hosts = self._convert_int_param(values.get(
+            'max', host_reservation['count_range'].split('-')[1]), 'max')
+        if min_hosts < 0 or max_hosts < min_hosts:
+            raise manager_ex.InvalidRange()
+        hypervisor_properties = values.get(
+            'hypervisor_properties',
+            host_reservation['hypervisor_properties'])
+        resource_properties = values.get(
+            'resource_properties',
+            host_reservation['resource_properties'])
+        allocs = db_api.host_allocation_get_all_by_values(
+            reservation_id=reservation_id)
+
+        allocs_to_remove = self._allocations_to_remove(
+            dates_before, dates_after, max_hosts, hypervisor_properties,
+            resource_properties, allocs)
+
+        if allocs_to_remove and reservation_status == 'active':
+            raise manager_ex.NotEnoughHostsAvailable()
+
+        kept_hosts = len(allocs) - len(allocs_to_remove)
+        if kept_hosts < max_hosts:
+            min_hosts = min_hosts - kept_hosts \
+                if (min_hosts - kept_hosts) > 0 else 0
+            max_hosts = max_hosts - kept_hosts
+            host_ids = self._matching_hosts(
+                hypervisor_properties, resource_properties,
+                str(min_hosts) + '-' + str(max_hosts),
+                dates_after['start_date'], dates_after['end_date'])
+            if len(host_ids) >= min_hosts:
+                for host_id in host_ids:
+                    db_api.host_allocation_create(
+                        {'compute_host_id': host_id,
+                         'reservation_id': reservation_id})
+            else:
+                raise manager_ex.NotEnoughHostsAvailable()
+
+        for allocation in allocs_to_remove:
+            db_api.host_allocation_destroy(allocation['id'])
+
+    def _allocations_to_remove(self, dates_before, dates_after, max_hosts,
+                               hypervisor_properties, resource_properties,
+                               allocs):
+        allocs_to_remove = []
+        requested_host_ids = [host['id'] for host in
+                              self._filter_hosts_by_properties(
+                                  hypervisor_properties, resource_properties)]
+
+        for alloc in allocs:
+            if alloc['compute_host_id'] not in requested_host_ids:
+                allocs_to_remove.append(alloc)
+                continue
+            if (dates_before['start_date'] > dates_after['start_date'] or
+                    dates_before['end_date'] < dates_after['end_date']):
+                full_periods = db_utils.get_full_periods(
+                    alloc['compute_host_id'],
+                    dates_after['start_date'],
+                    dates_after['end_date'],
+                    datetime.timedelta(seconds=1))
+
+                max_start = max(dates_before['start_date'],
+                                dates_after['start_date'])
+                min_end = min(dates_before['end_date'],
+                              dates_after['end_date'])
+
+                if not (len(full_periods) == 0 or
+                        (len(full_periods) == 1 and
+                         full_periods[0][0] == max_start and
+                         full_periods[0][1] == min_end)):
+                    allocs_to_remove.append(alloc)
+                    continue
+
+        kept_hosts = len(allocs) - len(allocs_to_remove)
+        if kept_hosts > max_hosts:
+            allocs_to_remove.extend(
+                [allocation for allocation in allocs
+                 if allocation not in allocs_to_remove
+                 ][:(kept_hosts - max_hosts)]
+            )
+
+        return allocs_to_remove
+
+    def _filter_hosts_by_properties(self, hypervisor_properties,
+                                    resource_properties):
+        filter = []
+        if hypervisor_properties:
+            filter += plugins_utils.convert_requirements(hypervisor_properties)
+        if resource_properties:
+            filter += plugins_utils.convert_requirements(resource_properties)
+        if filter:
+            return db_api.host_get_all_by_queries(filter)
+        else:
+            return db_api.host_list()
diff --git a/blazar/tests/manager/test_service.py b/blazar/tests/manager/test_service.py
index 88a01542..84b002de 100644
--- a/blazar/tests/manager/test_service.py
+++ b/blazar/tests/manager/test_service.py
@@ -628,8 +628,6 @@ class ServiceTestCase(tests.TestCase):
             {
                 'id': u'593e7028-c0d1-4d76-8642-2ffd890b324c',
                 'resource_type': 'virtual:instance',
-                'start_date': datetime.datetime(2013, 12, 20, 20, 00),
-                'end_date': datetime.datetime(2013, 12, 20, 21, 00)
             }
         ]
         event_get = self.patch(db_api, 'event_get_first_sorted_by_filters')
@@ -643,8 +641,6 @@ class ServiceTestCase(tests.TestCase):
         self.fake_plugin.update_reservation.assert_called_with(
             '593e7028-c0d1-4d76-8642-2ffd890b324c',
             {
-                'id': '593e7028-c0d1-4d76-8642-2ffd890b324c',
-                'resource_type': 'virtual:instance',
                 'start_date': datetime.datetime(2015, 12, 1, 20, 00),
                 'end_date': datetime.datetime(2015, 12, 1, 22, 00)
             }
@@ -659,6 +655,116 @@ class ServiceTestCase(tests.TestCase):
         self.event_update.assert_has_calls(calls)
         self.lease_update.assert_called_once_with(self.lease_id, lease_values)
 
+    def test_update_modify_reservations(self):
+        def fake_event_get(sort_key, sort_dir, filters):
+            if filters['event_type'] == 'start_lease':
+                return {'id': u'2eeb784a-2d84-4a89-a201-9d42d61eecb1'}
+            elif filters['event_type'] == 'end_lease':
+                return {'id': u'7085381b-45e0-4e5d-b24a-f965f5e6e5d7'}
+            elif filters['event_type'] == 'before_end_lease':
+                delta = datetime.timedelta(hours=1)
+                return {'id': u'452bf850-e223-4035-9d13-eb0b0197228f',
+                        'time': self.lease['end_date'] - delta,
+                        'status': 'UNDONE'}
+
+        lease_values = {
+            'reservations': [
+                {
+                    'id': u'593e7028-c0d1-4d76-8642-2ffd890b324c',
+                    'min': 3,
+                    'max': 3
+                }
+            ]
+        }
+        reservation_get_all = (
+            self.patch(self.db_api, 'reservation_get_all_by_lease_id'))
+        reservation_get_all.return_value = [
+            {
+                'id': u'593e7028-c0d1-4d76-8642-2ffd890b324c',
+                'resource_type': 'virtual:instance',
+            }
+        ]
+        event_get = self.patch(db_api, 'event_get_first_sorted_by_filters')
+        event_get.side_effect = fake_event_get
+        target = datetime.datetime(2013, 12, 15)
+        with mock.patch.object(datetime,
+                               'datetime',
+                               mock.Mock(wraps=datetime.datetime)) as patched:
+            patched.utcnow.return_value = target
+            self.manager.update_lease(self.lease_id, lease_values)
+        self.fake_plugin.update_reservation.assert_called_with(
+            '593e7028-c0d1-4d76-8642-2ffd890b324c',
+            {
+                'start_date': datetime.datetime(2013, 12, 20, 13, 00),
+                'end_date': datetime.datetime(2013, 12, 20, 15, 00),
+                'id': u'593e7028-c0d1-4d76-8642-2ffd890b324c',
+                'min': 3,
+                'max': 3
+            }
+        )
+        calls = [mock.call('2eeb784a-2d84-4a89-a201-9d42d61eecb1',
+                           {'time': datetime.datetime(2013, 12, 20, 13, 00)}),
+                 mock.call('7085381b-45e0-4e5d-b24a-f965f5e6e5d7',
+                           {'time': datetime.datetime(2013, 12, 20, 15, 00)}),
+                 mock.call('452bf850-e223-4035-9d13-eb0b0197228f',
+                           {'time': datetime.datetime(2013, 12, 20, 14, 00)})
+                 ]
+        self.event_update.assert_has_calls(calls)
+        self.lease_update.assert_called_once_with(self.lease_id, lease_values)
+
+    def test_update_modify_reservations_with_invalid_param(self):
+        lease_values = {
+            'reservations': [
+                {
+                    'id': u'593e7028-c0d1-4d76-8642-2ffd890b324c',
+                    'resource_type': 'invalid',
+                    'min': 3,
+                    'max': 3
+                }
+            ]
+        }
+        reservation_get_all = (
+            self.patch(self.db_api, 'reservation_get_all_by_lease_id'))
+        reservation_get_all.return_value = [
+            {
+                'id': u'593e7028-c0d1-4d76-8642-2ffd890b324c',
+                'resource_type': 'virtual:instance',
+            }
+        ]
+        target = datetime.datetime(2013, 12, 15)
+        with mock.patch.object(datetime,
+                               'datetime',
+                               mock.Mock(wraps=datetime.datetime)) as patched:
+            patched.utcnow.return_value = target
+            self.assertRaises(
+                manager_ex.CantUpdateParameter, self.manager.update_lease,
+                self.lease_id, lease_values)
+
+    def test_update_modify_reservations_without_reservation_id(self):
+        lease_values = {
+            'reservations': [
+                {
+                    'max': 3
+                }
+            ]
+        }
+        reservation_get_all = (
+            self.patch(self.db_api, 'reservation_get_all_by_lease_id'))
+        reservation_get_all.return_value = [
+            {
+                'id': u'593e7028-c0d1-4d76-8642-2ffd890b324c',
+                'resource_type': 'virtual:instance',
+            }
+        ]
+        target = datetime.datetime(2013, 12, 15)
+        with mock.patch.object(datetime,
+                               'datetime',
+                               mock.Mock(wraps=datetime.datetime)) as patched:
+            patched.utcnow.return_value = target
+            self.assertRaises(
+                manager_ex.MissingParameter, self.manager.update_lease,
+                self.lease_id, lease_values)
+
     def test_update_lease_started_modify_end_date_without_before_end(self):
         def fake_event_get(sort_key, sort_dir, filters):
             if filters['event_type'] == 'start_lease':
@@ -693,8 +799,6 @@ class ServiceTestCase(tests.TestCase):
         self.fake_plugin.update_reservation.assert_called_with(
             '593e7028-c0d1-4d76-8642-2ffd890b324c',
             {
-                'id': '593e7028-c0d1-4d76-8642-2ffd890b324c',
-                'resource_type': 'virtual:instance',
                 'start_date': datetime.datetime(2013, 12, 20, 13, 00),
                 'end_date': datetime.datetime(2013, 12, 20, 16, 00)
             }
@@ -744,8 +848,6 @@ class ServiceTestCase(tests.TestCase):
         self.fake_plugin.update_reservation.assert_called_with(
             '593e7028-c0d1-4d76-8642-2ffd890b324c',
             {
-                'id': '593e7028-c0d1-4d76-8642-2ffd890b324c',
-                'resource_type': 'virtual:instance',
                 'start_date': datetime.datetime(2013, 12, 20, 13, 00),
                 'end_date': datetime.datetime(2013, 12, 20, 16, 00)
             }
@@ -810,8 +912,6 @@ class ServiceTestCase(tests.TestCase):
         self.fake_plugin.update_reservation.assert_called_with(
             '593e7028-c0d1-4d76-8642-2ffd890b324c',
             {
-                'id': '593e7028-c0d1-4d76-8642-2ffd890b324c',
-                'resource_type': 'virtual:instance',
                 'start_date': datetime.datetime(2013, 12, 20, 13, 00),
                 'end_date': datetime.datetime(2013, 12, 20, 16, 00)
             }
diff --git a/blazar/tests/plugins/test_physical_host_plugin.py b/blazar/tests/plugins/test_physical_host_plugin.py
index d050bc18..dfab13de 100644
--- a/blazar/tests/plugins/test_physical_host_plugin.py
+++ b/blazar/tests/plugins/test_physical_host_plugin.py
@@ -482,7 +482,6 @@ class PhysicalHostPluginTestCase(tests.TestCase):
         reservation_get = self.patch(self.db_api, 'reservation_get')
         reservation_get.return_value = {
             'lease_id': u'10870923-6d56-45c9-b592-f788053f5baa',
-            'resource_id': u'91253650-cc34-4c4f-bbe8-c943aa7d0c9b'
         }
         lease_get = self.patch(self.db_api, 'lease_get')
         lease_get.return_value = {
@@ -490,19 +489,11 @@ class PhysicalHostPluginTestCase(tests.TestCase):
             'end_date': datetime.datetime(2013, 12, 19, 21, 00)
         }
         host_reservation_get = self.patch(self.db_api, 'host_reservation_get')
-        host_reservation_get.return_value = {
-            'aggregate_id': 1
-        }
-        get_computehosts = self.patch(self.nova.ReservationPool,
-                                      'get_computehosts')
-        get_computehosts.return_value = ['host1']
-        host_allocation_get_all = self.patch(
-            self.db_api,
-            'host_allocation_get_all_by_values')
+
         self.fake_phys_plugin.update_reservation(
             '706eb3bc-07ed-4383-be93-b32845ece672',
             values)
-        host_allocation_get_all.assert_not_called()
+        host_reservation_get.assert_not_called()
 
     def test_update_reservation_extend(self):
         values = {
@@ -512,7 +503,8 @@ class PhysicalHostPluginTestCase(tests.TestCase):
         reservation_get = self.patch(self.db_api, 'reservation_get')
         reservation_get.return_value = {
             'lease_id': u'10870923-6d56-45c9-b592-f788053f5baa',
-            'resource_id': u'91253650-cc34-4c4f-bbe8-c943aa7d0c9b'
+            'resource_id': u'91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'status': 'pending'
         }
         lease_get = self.patch(self.db_api, 'lease_get')
         lease_get.return_value = {
@@ -520,6 +512,11 @@ class PhysicalHostPluginTestCase(tests.TestCase):
             'end_date': datetime.datetime(2013, 12, 19, 21, 00)
         }
         host_reservation_get = self.patch(self.db_api, 'host_reservation_get')
+        host_reservation_get.return_value = {
+            'count_range': '1-1',
+            'hypervisor_properties': '["=", "$memory_mb", "256"]',
+            'resource_properties': ''
+        }
         host_allocation_get_all = self.patch(
             self.db_api,
             'host_allocation_get_all_by_values')
@@ -529,15 +526,26 @@ class PhysicalHostPluginTestCase(tests.TestCase):
                 'compute_host_id': 'host1'
             }
         ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = [{'id': 'host1'}]
         get_full_periods = self.patch(self.db_utils, 'get_full_periods')
         get_full_periods.return_value = [
             (datetime.datetime(2013, 12, 19, 20, 00),
              datetime.datetime(2013, 12, 19, 21, 00))
         ]
+        host_allocation_create = self.patch(
+            self.db_api,
+            'host_allocation_create')
+        host_allocation_destroy = self.patch(
+            self.db_api,
+            'host_allocation_destroy')
+
         self.fake_phys_plugin.update_reservation(
             '706eb3bc-07ed-4383-be93-b32845ece672',
             values)
-        host_reservation_get.assert_not_called()
+        host_allocation_create.assert_not_called()
+        host_allocation_destroy.assert_not_called()
 
     def test_update_reservation_move_failure(self):
         values = {
@@ -559,7 +567,7 @@ class PhysicalHostPluginTestCase(tests.TestCase):
             self.db_api,
             'host_reservation_get')
         host_reservation_get.return_value = {
-            'aggregate_id': 1,
+            'count_range': '1-1',
             'hypervisor_properties': '["=", "$memory_mb", "256"]',
             'resource_properties': ''
         }
@@ -572,6 +580,9 @@ class PhysicalHostPluginTestCase(tests.TestCase):
                 'compute_host_id': 'host1'
             }
         ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = [{'id': 'host1'}]
         get_full_periods = self.patch(self.db_utils, 'get_full_periods')
         get_full_periods.return_value = [
             (datetime.datetime(2013, 12, 20, 20, 30),
@@ -581,14 +592,13 @@ class PhysicalHostPluginTestCase(tests.TestCase):
                                       'get_computehosts')
         get_computehosts.return_value = ['host1']
         matching_hosts = self.patch(self.fake_phys_plugin, '_matching_hosts')
-        matching_hosts.return_value = ['host2']
+        matching_hosts.return_value = []
         self.assertRaises(
             manager_exceptions.NotEnoughHostsAvailable,
             self.fake_phys_plugin.update_reservation,
             '706eb3bc-07ed-4383-be93-b32845ece672',
             values)
         reservation_get.assert_called()
-        host_reservation_get.assert_not_called()
 
     def test_update_reservation_move_overlap(self):
         values = {
@@ -598,16 +608,22 @@ class PhysicalHostPluginTestCase(tests.TestCase):
         reservation_get = self.patch(self.db_api, 'reservation_get')
         reservation_get.return_value = {
             'lease_id': u'10870923-6d56-45c9-b592-f788053f5baa',
-            'resource_id': u'91253650-cc34-4c4f-bbe8-c943aa7d0c9b'
+            'resource_id': u'91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'status': 'pending'
         }
         lease_get = self.patch(self.db_api, 'lease_get')
         lease_get.return_value = {
             'start_date': datetime.datetime(2013, 12, 19, 20, 00),
             'end_date': datetime.datetime(2013, 12, 19, 21, 00)
         }
-        host_reservation_get_by_reservation_id = self.patch(
+        host_reservation_get = self.patch(
             self.db_api,
-            'host_reservation_get_by_reservation_id')
+            'host_reservation_get')
+        host_reservation_get.return_value = {
+            'count_range': '1-1',
+            'hypervisor_properties': '["=", "$memory_mb", "256"]',
+            'resource_properties': ''
+        }
         host_allocation_get_all = self.patch(
             self.db_api,
             'host_allocation_get_all_by_values')
@@ -617,18 +633,26 @@ class PhysicalHostPluginTestCase(tests.TestCase):
                 'compute_host_id': 'host1'
             }
         ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = [{'id': 'host1'}]
         get_full_periods = self.patch(self.db_utils, 'get_full_periods')
         get_full_periods.return_value = [
             (datetime.datetime(2013, 12, 19, 20, 30),
              datetime.datetime(2013, 12, 19, 21, 00))
         ]
-        get_computehosts = self.patch(self.nova.ReservationPool,
-                                      'get_computehosts')
-        get_computehosts.return_value = []
+        host_allocation_create = self.patch(
+            self.db_api,
+            'host_allocation_create')
+        host_allocation_destroy = self.patch(
+            self.db_api,
+            'host_allocation_destroy')
+
         self.fake_phys_plugin.update_reservation(
             '706eb3bc-07ed-4383-be93-b32845ece672',
             values)
-        host_reservation_get_by_reservation_id.assert_not_called()
+        host_allocation_create.assert_not_called()
+        host_allocation_destroy.assert_not_called()
 
     def test_update_reservation_move_realloc(self):
         values = {
@@ -646,14 +670,12 @@ class PhysicalHostPluginTestCase(tests.TestCase):
             'start_date': datetime.datetime(2013, 12, 19, 20, 00),
             'end_date': datetime.datetime(2013, 12, 19, 21, 00)
         }
-        host_get = self.patch(self.db_api, 'host_get')
-        host_get.side_effect = ({'service_name': 'host1'},
-                                {'service_name': 'host2'})
         host_reservation_get = self.patch(
             self.db_api,
             'host_reservation_get')
         host_reservation_get.return_value = {
             'aggregate_id': 1,
+            'count_range': '1-1',
             'hypervisor_properties': '["=", "$memory_mb", "256"]',
             'resource_properties': ''
         }
@@ -666,6 +688,10 @@ class PhysicalHostPluginTestCase(tests.TestCase):
                 'compute_host_id': 'host1'
             }
         ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = [{'id': 'host1'},
+                                                {'id': 'host2'}]
         host_allocation_create = self.patch(
             self.db_api,
             'host_allocation_create')
@@ -677,9 +703,6 @@ class PhysicalHostPluginTestCase(tests.TestCase):
             (datetime.datetime(2013, 12, 20, 20, 30),
              datetime.datetime(2013, 12, 20, 21, 00))
         ]
-        get_computehosts = self.patch(self.nova.ReservationPool,
-                                      'get_computehosts')
-        get_computehosts.return_value = ['host1']
         matching_hosts = self.patch(self.fake_phys_plugin, '_matching_hosts')
         matching_hosts.return_value = ['host2']
         self.fake_phys_plugin.update_reservation(
@@ -695,14 +718,514 @@ class PhysicalHostPluginTestCase(tests.TestCase):
                 'reservation_id': '706eb3bc-07ed-4383-be93-b32845ece672'
             }
         )
-        self.remove_compute_host.assert_called_with(
-            1,
-            ['host1']
+
+    def test_update_reservation_min_increase_success(self):
+        values = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00),
+            'min': 3
+        }
+        reservation_get = self.patch(self.db_api, 'reservation_get')
+        reservation_get.return_value = {
+            'lease_id': '10870923-6d56-45c9-b592-f788053f5baa',
+            'resource_id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'status': 'pending'
+        }
+        lease_get = self.patch(self.db_api, 'lease_get')
+        lease_get.return_value = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00)
+        }
+        host_reservation_get = self.patch(self.db_api, 'host_reservation_get')
+        host_reservation_get.return_value = {
+            'id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'count_range': '2-3',
+            'hypervisor_properties': '["=", "$memory_mb", "16384"]',
+            'resource_properties': ''
+        }
+        host_allocation_get_all = self.patch(
+            self.db_api, 'host_allocation_get_all_by_values')
+        host_allocation_get_all.return_value = [
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a6',
+                'compute_host_id': 'host1'
+            },
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a7',
+                'compute_host_id': 'host2'
+            }
+        ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = [
+            {'id': 'host1'},
+            {'id': 'host2'},
+            {'id': 'host3'}
+        ]
+        host_allocation_destroy = self.patch(self.db_api,
+                                             'host_allocation_destroy')
+        host_allocation_create = self.patch(self.db_api,
+                                            'host_allocation_create')
+        matching_hosts = self.patch(self.fake_phys_plugin, '_matching_hosts')
+        matching_hosts.return_value = ['host3']
+        host_reservation_update = self.patch(self.db_api,
+                                             'host_reservation_update')
+
+        self.fake_phys_plugin.update_reservation(
+            '706eb3bc-07ed-4383-be93-b32845ece672',
+            values)
+        host_reservation_get.assert_called_with(
+            '91253650-cc34-4c4f-bbe8-c943aa7d0c9b')
+        matching_hosts.assert_called_with(
+            '["=", "$memory_mb", "16384"]',
+            '',
+            '1-1',
+            datetime.datetime(2017, 7, 12, 20, 00),
+            datetime.datetime(2017, 7, 12, 21, 00)
         )
-        self.add_compute_host.assert_called_with(
-            1,
-            'host2'
+        host_allocation_destroy.assert_not_called()
+        host_allocation_create.assert_called_with(
+            {
+                'compute_host_id': 'host3',
+                'reservation_id': '706eb3bc-07ed-4383-be93-b32845ece672'
+            }
         )
+        host_reservation_update.assert_called_with(
+            '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            {'count_range': '3-3'}
+        )
+
+    def test_update_reservation_min_increase_fail(self):
+        values = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00),
+            'min': 3
+        }
+        reservation_get = self.patch(self.db_api, 'reservation_get')
+        reservation_get.return_value = {
+            'lease_id': '10870923-6d56-45c9-b592-f788053f5baa',
+            'resource_id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'status': 'pending'
+        }
+        lease_get = self.patch(self.db_api, 'lease_get')
+        lease_get.return_value = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00)
+        }
+        host_reservation_get = self.patch(self.db_api, 'host_reservation_get')
+        host_reservation_get.return_value = {
+            'id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'count_range': '2-3',
+            'hypervisor_properties': '["=", "$memory_mb", "16384"]',
+            'resource_properties': ''
+        }
+        host_allocation_get_all = self.patch(
+            self.db_api, 'host_allocation_get_all_by_values')
+        host_allocation_get_all.return_value = [
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a6',
+                'compute_host_id': 'host1'
+            },
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a7',
+                'compute_host_id': 'host2'
+            }
+        ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = [
+            {'id': 'host1'},
+            {'id': 'host2'}
+        ]
+        matching_hosts = self.patch(self.fake_phys_plugin, '_matching_hosts')
+        matching_hosts.return_value = []
+
+        self.assertRaises(
+            manager_exceptions.NotEnoughHostsAvailable,
+            self.fake_phys_plugin.update_reservation,
+            '706eb3bc-07ed-4383-be93-b32845ece672',
+            values)
+        matching_hosts.assert_called_with(
+            '["=", "$memory_mb", "16384"]',
+            '',
+            '1-1',
+            datetime.datetime(2017, 7, 12, 20, 00),
+            datetime.datetime(2017, 7, 12, 21, 00)
+        )
+
+    def test_update_reservation_min_decrease(self):
+        values = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00),
+            'min': 1
+        }
+        reservation_get = self.patch(self.db_api, 'reservation_get')
+        reservation_get.return_value = {
+            'lease_id': '10870923-6d56-45c9-b592-f788053f5baa',
+            'resource_id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'status': 'pending'
+        }
+        lease_get = self.patch(self.db_api, 'lease_get')
+        lease_get.return_value = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00)
+        }
+        host_reservation_get = self.patch(self.db_api, 'host_reservation_get')
+        host_reservation_get.return_value = {
+            'id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'count_range': '2-2',
+            'hypervisor_properties': '["=", "$memory_mb", "16384"]',
+            'resource_properties': ''
+        }
+        host_allocation_get_all = self.patch(
+            self.db_api, 'host_allocation_get_all_by_values')
+        host_allocation_get_all.return_value = [
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a6',
+                'compute_host_id': 'host1'
+            },
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a7',
+                'compute_host_id': 'host2'
+            }
+        ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = [
+            {'id': 'host1'},
+            {'id': 'host2'}
+        ]
+        matching_hosts = self.patch(self.fake_phys_plugin, '_matching_hosts')
+        host_allocation_destroy = self.patch(self.db_api,
+                                             'host_allocation_destroy')
+        host_allocation_create = self.patch(self.db_api,
+                                            'host_allocation_create')
+        host_reservation_update = self.patch(self.db_api,
+                                             'host_reservation_update')
+
+        self.fake_phys_plugin.update_reservation(
+            '706eb3bc-07ed-4383-be93-b32845ece672',
+            values)
+        matching_hosts.assert_not_called()
+        host_allocation_destroy.assert_not_called()
+        host_allocation_create.assert_not_called()
+        host_reservation_update.assert_called_with(
+            '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            {'count_range': '1-2'}
+        )
+
+    def test_update_reservation_max_increase_alloc(self):
+        values = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00),
+            'max': 3
+        }
+        reservation_get = self.patch(self.db_api, 'reservation_get')
+        reservation_get.return_value = {
+            'lease_id': '10870923-6d56-45c9-b592-f788053f5baa',
+            'resource_id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'status': 'pending'
+        }
+        lease_get = self.patch(self.db_api, 'lease_get')
+        lease_get.return_value = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00)
+        }
+        host_reservation_get = self.patch(self.db_api, 'host_reservation_get')
+        host_reservation_get.return_value = {
+            'id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'count_range': '1-2',
+            'hypervisor_properties': '["=", "$memory_mb", "16384"]',
+            'resource_properties': ''
+        }
+        host_allocation_get_all = self.patch(
+            self.db_api, 'host_allocation_get_all_by_values')
+        host_allocation_get_all.return_value = [
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a6',
+                'compute_host_id': 'host1'
+            },
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a7',
+                'compute_host_id': 'host2'
+            }
+        ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = [
+            {'id': 'host1'},
+            {'id': 'host2'},
+            {'id': 'host3'}
+        ]
+        host_allocation_destroy = self.patch(self.db_api,
+                                             'host_allocation_destroy')
+        host_allocation_create = self.patch(self.db_api,
+                                            'host_allocation_create')
+        matching_hosts = self.patch(self.fake_phys_plugin, '_matching_hosts')
+        matching_hosts.return_value = ['host3']
+        host_reservation_update = self.patch(self.db_api,
+                                             'host_reservation_update')
+
+        self.fake_phys_plugin.update_reservation(
+            '706eb3bc-07ed-4383-be93-b32845ece672',
+            values)
+        host_reservation_get.assert_called_with(
+            '91253650-cc34-4c4f-bbe8-c943aa7d0c9b')
+        matching_hosts.assert_called_with(
+            '["=", "$memory_mb", "16384"]',
+            '',
+            '0-1',
+            datetime.datetime(2017, 7, 12, 20, 00),
+            datetime.datetime(2017, 7, 12, 21, 00)
+        )
+        host_allocation_destroy.assert_not_called()
+        host_allocation_create.assert_called_with(
+            {
+                'compute_host_id': 'host3',
+                'reservation_id': '706eb3bc-07ed-4383-be93-b32845ece672'
+            }
+        )
+        host_reservation_update.assert_called_with(
+            '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            {'count_range': '1-3'}
+        )
+
+    def test_update_reservation_max_increase_noalloc(self):
+        values = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00),
+            'max': 3
+        }
+        reservation_get = self.patch(self.db_api, 'reservation_get')
+        reservation_get.return_value = {
+            'lease_id': '10870923-6d56-45c9-b592-f788053f5baa',
+            'resource_id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'status': 'pending'
+        }
+        lease_get = self.patch(self.db_api, 'lease_get')
+        lease_get.return_value = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00)
+        }
+        host_reservation_get = self.patch(self.db_api, 'host_reservation_get')
+        host_reservation_get.return_value = {
+            'id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'count_range': '1-2',
+            'hypervisor_properties': '["=", "$memory_mb", "16384"]',
+            'resource_properties': ''
+        }
+        host_allocation_get_all = self.patch(
+            self.db_api, 'host_allocation_get_all_by_values')
+        host_allocation_get_all.return_value = [
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a6',
+                'compute_host_id': 'host1'
+            },
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a7',
+                'compute_host_id': 'host2'
+            }
+        ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = [
+            {'id': 'host1'},
+            {'id': 'host2'}
+        ]
+        matching_hosts = self.patch(self.fake_phys_plugin, '_matching_hosts')
+        matching_hosts.return_value = []
+        host_reservation_update = self.patch(self.db_api,
+                                             'host_reservation_update')
+
+        self.fake_phys_plugin.update_reservation(
+            '706eb3bc-07ed-4383-be93-b32845ece672',
+            values)
+        host_reservation_get.assert_called_with(
+            '91253650-cc34-4c4f-bbe8-c943aa7d0c9b')
+        matching_hosts.assert_called_with(
+            '["=", "$memory_mb", "16384"]',
+            '',
+            '0-1',
+            datetime.datetime(2017, 7, 12, 20, 00),
+            datetime.datetime(2017, 7, 12, 21, 00)
+        )
+        host_reservation_update.assert_called_with(
+            '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            {'count_range': '1-3'}
+        )
+
+    def test_update_reservation_max_decrease(self):
+        values = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00),
+            'max': 1
+        }
+        reservation_get = self.patch(self.db_api, 'reservation_get')
+        reservation_get.return_value = {
+            'lease_id': '10870923-6d56-45c9-b592-f788053f5baa',
+            'resource_id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'status': 'pending'
+        }
+        lease_get = self.patch(self.db_api, 'lease_get')
+        lease_get.return_value = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00)
+        }
+        host_reservation_get = self.patch(self.db_api, 'host_reservation_get')
+        host_reservation_get.return_value = {
+            'id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'count_range': '1-2',
+            'hypervisor_properties': '["=", "$memory_mb", "16384"]',
+            'resource_properties': ''
+        }
+        host_allocation_get_all = self.patch(
+            self.db_api, 'host_allocation_get_all_by_values')
+        host_allocation_get_all.return_value = [
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a6',
+                'compute_host_id': 'host1'
+            },
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a7',
+                'compute_host_id': 'host2'
+            }
+        ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = [
+            {'id': 'host1'},
+            {'id': 'host2'}
+        ]
+        host_allocation_destroy = self.patch(self.db_api,
+                                             'host_allocation_destroy')
+        host_reservation_update = self.patch(self.db_api,
+                                             'host_reservation_update')
+
+        self.fake_phys_plugin.update_reservation(
+            '706eb3bc-07ed-4383-be93-b32845ece672',
+            values)
+        host_reservation_get.assert_called_with(
+            '91253650-cc34-4c4f-bbe8-c943aa7d0c9b')
+        host_allocation_destroy.assert_called_with(
+            'dd305477-4df8-4547-87f6-69069ee546a6')
+        host_reservation_update.assert_called_with(
+            '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            {'count_range': '1-1'}
+        )
+
+    def test_update_reservation_realloc_with_properties_change(self):
+        values = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00),
+            'hypervisor_properties': '["=", "$memory_mb", "32768"]',
+        }
+        reservation_get = self.patch(self.db_api, 'reservation_get')
+        reservation_get.return_value = {
+            'lease_id': '10870923-6d56-45c9-b592-f788053f5baa',
+            'resource_id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'status': 'pending'
+        }
+        lease_get = self.patch(self.db_api, 'lease_get')
+        lease_get.return_value = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00)
+        }
+        host_reservation_get = self.patch(self.db_api, 'host_reservation_get')
+        host_reservation_get.return_value = {
+            'id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'count_range': '1-1',
+            'hypervisor_properties': '["=", "$memory_mb", "16384"]',
+            'resource_properties': ''
+        }
+        host_allocation_get_all = self.patch(
+            self.db_api, 'host_allocation_get_all_by_values')
+        host_allocation_get_all.return_value = [
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a6',
+                'compute_host_id': 'host1'
+            }
+        ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = [{'id': 'host2'}]
+        matching_hosts = self.patch(self.fake_phys_plugin, '_matching_hosts')
+        matching_hosts.return_value = ['host2']
+        host_allocation_create = self.patch(self.db_api,
+                                            'host_allocation_create')
+        host_allocation_destroy = self.patch(self.db_api,
+                                             'host_allocation_destroy')
+        host_reservation_update = self.patch(self.db_api,
+                                             'host_reservation_update')
+
+        self.fake_phys_plugin.update_reservation(
+            '706eb3bc-07ed-4383-be93-b32845ece672',
+            values)
+        host_reservation_get.assert_called_with(
+            '91253650-cc34-4c4f-bbe8-c943aa7d0c9b')
+        matching_hosts.assert_called_with(
+            '["=", "$memory_mb", "32768"]',
+            '',
+            '1-1',
+            datetime.datetime(2017, 7, 12, 20, 00),
+            datetime.datetime(2017, 7, 12, 21, 00)
+        )
+        host_allocation_create.assert_called_with(
+            {
+                'compute_host_id': 'host2',
+                'reservation_id': '706eb3bc-07ed-4383-be93-b32845ece672'
+            }
+        )
+        host_allocation_destroy.assert_called_with(
+            'dd305477-4df8-4547-87f6-69069ee546a6'
+        )
+        host_reservation_update.assert_called_with(
+            '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            {'hypervisor_properties': '["=", "$memory_mb", "32768"]'}
+        )
+
+    def test_update_reservation_no_requested_hosts_available(self):
+        values = {
+            'start_date': datetime.datetime(2017, 7, 12, 20, 00),
+            'end_date': datetime.datetime(2017, 7, 12, 21, 00),
+            'resource_properties': '[">=", "$vcpus", "32768"]'
+        }
+        reservation_get = self.patch(self.db_api, 'reservation_get')
+        reservation_get.return_value = {
+            'lease_id': '10870923-6d56-45c9-b592-f788053f5baa',
+            'resource_id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'status': 'pending'
+        }
+        lease_get = self.patch(self.db_api, 'lease_get')
+        lease_get.return_value = {
+            'start_date': datetime.datetime(2013, 12, 19, 20, 00),
+            'end_date': datetime.datetime(2013, 12, 19, 21, 00)
+        }
+        host_reservation_get = self.patch(self.db_api, 'host_reservation_get')
+        host_reservation_get.return_value = {
+            'id': '91253650-cc34-4c4f-bbe8-c943aa7d0c9b',
+            'count_range': '1-1',
+            'hypervisor_properties': '["=", "$memory_mb", "16384"]',
+            'resource_properties': ''
+        }
+        host_allocation_get_all = self.patch(
+            self.db_api, 'host_allocation_get_all_by_values')
+        host_allocation_get_all.return_value = [
+            {
+                'id': 'dd305477-4df8-4547-87f6-69069ee546a6',
+                'compute_host_id': 'host1'
+            }
+        ]
+        host_get_all_by_queries = self.patch(self.db_api,
+                                             'host_get_all_by_queries')
+        host_get_all_by_queries.return_value = []
+        matching_hosts = self.patch(self.fake_phys_plugin, '_matching_hosts')
+        matching_hosts.return_value = []
+
+        self.assertRaises(
+            manager_exceptions.NotEnoughHostsAvailable,
+            self.fake_phys_plugin.update_reservation,
+            '441c1476-9f8f-4700-9f30-cd9b6fef3509',
+            values)
 
     def test_on_start(self):
         host_reservation_get = self.patch(self.db_api, 'host_reservation_get')
diff --git a/doc/source/restapi/rest_api_v1.0.rst b/doc/source/restapi/rest_api_v1.0.rst
index eaa7b5be..9ee4ae9e 100644
--- a/doc/source/restapi/rest_api_v1.0.rst
+++ b/doc/source/restapi/rest_api_v1.0.rst
@@ -358,6 +358,12 @@ are mentioned.
         {
             "name": "lease_new_foo",
             "end_date": "2017-3-12 12:00",
+            "reservations": [
+                {
+                    "id": "087bc740-6d2d-410b-9d47-c7b2b55a9d36",
+                    "max": 3
+                }
+            ]
         }
 
     **response**
@@ -381,7 +387,7 @@ are mentioned.
                         "status": "pending",
                         "lease_id": "6ee55c78-ac52-41a6-99af-2d2d73bcc466",
                         "min": 1,
-                        "max": 1,
+                        "max": 3,
                         "resource_id": "5",
                         "created_at": "2017-02-21 14:50:38",
                         "updated_at": null,
diff --git a/releasenotes/notes/update-reserved-capacity-9f079395959f4474.yaml b/releasenotes/notes/update-reserved-capacity-9f079395959f4474.yaml
new file mode 100644
index 00000000..e35f3b82
--- /dev/null
+++ b/releasenotes/notes/update-reserved-capacity-9f079395959f4474.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    The lease-update API supports update of reservation properties. e.g. min,
+    max, hypervisor_properties and resource_properties for host reservation.