diff --git a/trove/cmd/manage.py b/trove/cmd/manage.py
index abe3c02876..8bccb60d6e 100644
--- a/trove/cmd/manage.py
+++ b/trove/cmd/manage.py
@@ -73,7 +73,7 @@ class Commands(object):
                                                       packages, active,
                                                       version=version)
             print("Datastore version '%s(%s)' updated." %
-                  (version_name, version))
+                  (version_name, version or version_name))
         except exception.DatastoreNotFound as e:
             print(e)
 
@@ -99,63 +99,96 @@ class Commands(object):
             datastore, datastore_version_name)
 
     def datastore_version_flavor_add(self, datastore_name,
-                                     datastore_version_name, flavor_ids):
+                                     datastore_version_name, flavor_ids,
+                                     version=None):
         """Adds flavors for a given datastore version id."""
+        dsmetadata = datastore_models.DatastoreVersionMetadata
         try:
-            dsmetadata = datastore_models.DatastoreVersionMetadata
+            datastore_version_id = dsmetadata.datastore_version_find(
+                datastore_name,
+                datastore_version_name,
+                version_number=version)
+
             dsmetadata.add_datastore_version_flavor_association(
-                datastore_name, datastore_version_name, flavor_ids.split(","))
+                datastore_version_id, flavor_ids.split(","))
             print("Added flavors '%s' to the '%s' '%s'."
                   % (flavor_ids, datastore_name, datastore_version_name))
-        except exception.DatastoreVersionNotFound as e:
+        except Exception as e:
             print(e)
 
     def datastore_version_flavor_delete(self, datastore_name,
-                                        datastore_version_name, flavor_id):
+                                        datastore_version_name, flavor_id,
+                                        version=None):
         """Deletes a flavor's association with a given datastore."""
         try:
             dsmetadata = datastore_models.DatastoreVersionMetadata
+
+            datastore_version_id = dsmetadata.datastore_version_find(
+                datastore_name,
+                datastore_version_name,
+                version_number=version)
+
             dsmetadata.delete_datastore_version_flavor_association(
-                datastore_name, datastore_version_name, flavor_id)
+                datastore_version_id, flavor_id)
             print("Deleted flavor '%s' from '%s' '%s'."
                   % (flavor_id, datastore_name, datastore_version_name))
-        except exception.DatastoreVersionNotFound as e:
+        except Exception as e:
             print(e)
 
     def datastore_version_volume_type_add(self, datastore_name,
                                           datastore_version_name,
-                                          volume_type_ids):
+                                          volume_type_ids, version=None):
         """Adds volume type assiciation for a given datastore version id."""
         try:
             dsmetadata = datastore_models.DatastoreVersionMetadata
+
+            datastore_version_id = dsmetadata.datastore_version_find(
+                datastore_name,
+                datastore_version_name,
+                version_number=version)
+
             dsmetadata.add_datastore_version_volume_type_association(
-                datastore_name, datastore_version_name,
+                datastore_version_id,
                 volume_type_ids.split(","))
             print("Added volume type '%s' to the '%s' '%s'."
                   % (volume_type_ids, datastore_name, datastore_version_name))
-        except exception.DatastoreVersionNotFound as e:
+        except Exception as e:
             print(e)
 
     def datastore_version_volume_type_delete(self, datastore_name,
                                              datastore_version_name,
-                                             volume_type_id):
+                                             volume_type_id, version=None):
         """Deletes a volume type association with a given datastore."""
         try:
             dsmetadata = datastore_models.DatastoreVersionMetadata
+
+            datastore_version_id = dsmetadata.datastore_version_find(
+                datastore_name,
+                datastore_version_name,
+                version_number=version)
+
             dsmetadata.delete_datastore_version_volume_type_association(
-                datastore_name, datastore_version_name, volume_type_id)
+                datastore_version_id, volume_type_id)
             print("Deleted volume type '%s' from '%s' '%s'."
                   % (volume_type_id, datastore_name, datastore_version_name))
-        except exception.DatastoreVersionNotFound as e:
+        except Exception as e:
             print(e)
 
     def datastore_version_volume_type_list(self, datastore_name,
-                                           datastore_version_name):
+                                           datastore_version_name,
+                                           version=None):
         """Lists volume type association with a given datastore."""
         try:
             dsmetadata = datastore_models.DatastoreVersionMetadata
-            vtlist = dsmetadata.list_datastore_volume_type_associations(
-                datastore_name, datastore_version_name)
+
+            datastore_version_id = dsmetadata.datastore_version_find(
+                datastore_name,
+                datastore_version_name,
+                version_number=version)
+
+            vtlist = dsmetadata. \
+                list_datastore_version_volume_type_associations(
+                    datastore_version_id)
             if vtlist.count() > 0:
                 for volume_type in vtlist:
                     print("Datastore: %s, Version: %s, Volume Type: %s" %
@@ -165,7 +198,7 @@ class Commands(object):
                 print("No Volume Type Associations found for Datastore: %s, "
                       "Version: %s." %
                       (datastore_name, datastore_version_name))
-        except exception.DatastoreVersionNotFound as e:
+        except Exception as e:
             print(e)
 
     def params_of(self, command_name):
@@ -262,49 +295,79 @@ def main():
             help='Name of the datastore version.')
 
         parser = subparser.add_parser(
-            'datastore_version_flavor_add', help='Adds flavor association to '
-            'a given datastore and datastore version.')
+            'datastore_version_flavor_add',
+            help='Adds flavor association to a given datastore and datastore '
+                 'version.')
         parser.add_argument('datastore_name', help='Name of the datastore.')
         parser.add_argument('datastore_version_name', help='Name of the '
                             'datastore version.')
         parser.add_argument('flavor_ids', help='Comma separated list of '
                             'flavor ids.')
+        parser.add_argument(
+            '--version',
+            help='The version number of the datastore version, e.g. 5.7.30. '
+                 'If not specified, use <datastore_version_name> as default '
+                 'value.')
 
         parser = subparser.add_parser(
-            'datastore_version_flavor_delete', help='Deletes a flavor '
-            'associated with a given datastore and datastore version.')
+            'datastore_version_flavor_delete',
+            help='Deletes a flavor associated with a given datastore and '
+                 'datastore version.')
         parser.add_argument('datastore_name', help='Name of the datastore.')
         parser.add_argument('datastore_version_name', help='Name of the '
                             'datastore version.')
         parser.add_argument('flavor_id', help='The flavor to be deleted for '
                             'a given datastore and datastore version.')
+        parser.add_argument(
+            '--version',
+            help='The version number of the datastore version, e.g. 5.7.30. '
+                 'If not specified, use <datastore_version_name> as default '
+                 'value.')
+
         parser = subparser.add_parser(
-            'datastore_version_volume_type_add', help='Adds volume_type '
-            'association to a given datastore and datastore version.')
+            'datastore_version_volume_type_add',
+            help='Adds volume_type association to a given datastore and '
+                 'datastore version.')
         parser.add_argument('datastore_name', help='Name of the datastore.')
         parser.add_argument('datastore_version_name', help='Name of the '
                             'datastore version.')
         parser.add_argument('volume_type_ids', help='Comma separated list of '
                             'volume_type ids.')
+        parser.add_argument(
+            '--version',
+            help='The version number of the datastore version, e.g. 5.7.30. '
+                 'If not specified, use <datastore_version_name> as default '
+                 'value.')
 
         parser = subparser.add_parser(
             'datastore_version_volume_type_delete',
             help='Deletes a volume_type '
-            'associated with a given datastore and datastore version.')
+                 'associated with a given datastore and datastore version.')
         parser.add_argument('datastore_name', help='Name of the datastore.')
         parser.add_argument('datastore_version_name', help='Name of the '
                             'datastore version.')
         parser.add_argument('volume_type_id', help='The volume_type to be '
                             'deleted for a given datastore and datastore '
                             'version.')
+        parser.add_argument(
+            '--version',
+            help='The version number of the datastore version, e.g. 5.7.30. '
+                 'If not specified, use <datastore_version_name> as default '
+                 'value.')
 
         parser = subparser.add_parser(
             'datastore_version_volume_type_list',
             help='Lists the volume_types '
-            'associated with a given datastore and datastore version.')
+                 'associated with a given datastore and datastore version.')
         parser.add_argument('datastore_name', help='Name of the datastore.')
         parser.add_argument('datastore_version_name', help='Name of the '
                             'datastore version.')
+        parser.add_argument(
+            '--version',
+            help='The version number of the datastore version, e.g. 5.7.30. '
+                 'If not specified, use <datastore_version_name> as default '
+                 'value.')
+
     cfg.custom_parser('action', actions)
     cfg.parse_args(sys.argv)
 
diff --git a/trove/common/apischema.py b/trove/common/apischema.py
index 3755dc8d60..d1dec14608 100644
--- a/trove/common/apischema.py
+++ b/trove/common/apischema.py
@@ -410,7 +410,8 @@ instance = {
                         "additionalProperties": True,
                         "properties": {
                             "type": non_empty_string,
-                            "version": non_empty_string
+                            "version": non_empty_string,
+                            "version_number": non_empty_string
                         }
                     },
                     "nics": nics,
diff --git a/trove/common/exception.py b/trove/common/exception.py
index f89bef1fb2..d4b44b0c76 100644
--- a/trove/common/exception.py
+++ b/trove/common/exception.py
@@ -134,38 +134,38 @@ class DatastoresNotFound(NotFound):
 class DatastoreFlavorAssociationNotFound(NotFound):
 
     message = _("Flavor %(id)s is not supported for datastore "
-                "%(datastore)s version %(datastore_version)s")
+                "version %(datastore_version_id)s")
 
 
 class DatastoreFlavorAssociationAlreadyExists(TroveError):
 
     message = _("Flavor %(id)s is already associated with "
-                "datastore %(datastore)s version %(datastore_version)s")
+                "datastore version %(datastore_version_id)s")
 
 
 class DatastoreVolumeTypeAssociationNotFound(NotFound):
 
     message = _("The volume type %(id)s is not valid for datastore "
-                "%(datastore)s and version %(version_id)s.")
+                "version %(datastore_version_id)s.")
 
 
 class DatastoreVolumeTypeAssociationAlreadyExists(TroveError):
 
-    message = _("Datastore '%(datastore)s' version %(datastore_version)s "
+    message = _("Datastore version %(datastore_version_id)s "
                 "and volume-type %(id)s mapping already exists.")
 
 
 class DataStoreVersionVolumeTypeRequired(TroveError):
 
     message = _("Only specific volume types are allowed for a "
-                "datastore %(datastore)s version %(datastore_version)s. "
+                "datastore version %(datastore_version_id)s. "
                 "You must specify a valid volume type.")
 
 
 class DatastoreVersionNoVolumeTypes(TroveError):
 
     message = _("No valid volume types could be found for datastore "
-                "%(datastore)s and version %(datastore_version)s.")
+                "version %(datastore_version_id)s.")
 
 
 class DatastoreNoVersion(TroveError):
@@ -194,6 +194,13 @@ class DatastoreVersionsInUse(BadRequest):
     message = _("Datastore version is in use by %(resource)s.")
 
 
+class DatastoreVersionsNoUniqueMatch(TroveError):
+
+    message = _("Multiple datastore versions found for '%(name)s', "
+                "use an UUID or specify both the name and version number to "
+                "be more specific.")
+
+
 class DatastoreDefaultDatastoreNotFound(TroveError):
 
     message = _("Please specify datastore. Default datastore "
@@ -222,12 +229,6 @@ class DatastoreOperationNotSupported(TroveError):
                 "the '%(datastore)s' datastore.")
 
 
-class NoUniqueMatch(TroveError):
-
-    message = _("Multiple matches found for '%(name)s', "
-                "use an UUID to be more specific.")
-
-
 class OverLimit(TroveError):
 
     # internal_message is used for log, stop translating.
diff --git a/trove/datastore/models.py b/trove/datastore/models.py
index bf1b890331..f63136f16a 100644
--- a/trove/datastore/models.py
+++ b/trove/datastore/models.py
@@ -405,15 +405,25 @@ class DatastoreVersion(object):
             return cls(DBDatastoreVersion.find_by(datastore_id=datastore.id,
                                                   id=id_or_name))
 
-        version = version or id_or_name
-        versions = DBDatastoreVersion.find_all(datastore_id=datastore.id,
-                                               name=id_or_name,
-                                               version=version)
-        if versions.count() == 0:
-            raise exception.DatastoreVersionNotFound(version=version)
-        if versions.count() > 1:
-            raise exception.NoUniqueMatch(name=id_or_name)
-        return cls(versions.first())
+        if not version:
+            versions = DBDatastoreVersion.find_all(datastore_id=datastore.id,
+                                                   name=id_or_name)
+            if versions.count() == 0:
+                raise exception.DatastoreVersionNotFound(version=id_or_name)
+            if versions.count() > 1:
+                raise exception.DatastoreVersionsNoUniqueMatch(name=id_or_name)
+
+            db_version = versions.first()
+        else:
+            try:
+                db_version = DBDatastoreVersion.find_by(
+                    datastore_id=datastore.id,
+                    name=id_or_name,
+                    version=version)
+            except exception.ModelNotFoundError:
+                raise exception.DatastoreVersionNotFound(version=version)
+
+        return cls(db_version)
 
     @classmethod
     def load_by_uuid(cls, uuid):
@@ -508,7 +518,8 @@ class DatastoreVersions(object):
             yield item
 
 
-def get_datastore_version(type=None, version=None, return_inactive=False):
+def get_datastore_version(type=None, version=None, return_inactive=False,
+                          version_number=None):
     datastore = type or CONF.default_datastore
     if not datastore:
         raise exception.DatastoreDefaultDatastoreNotDefined()
@@ -520,11 +531,12 @@ def get_datastore_version(type=None, version=None, return_inactive=False):
                 datastore=datastore)
         raise
 
-    version = version or datastore.default_version_id
-    if not version:
+    version_id = version or datastore.default_version_id
+    if not version_id:
         raise exception.DatastoreDefaultVersionNotFound(
             datastore=datastore.name)
-    datastore_version = DatastoreVersion.load(datastore, version)
+    datastore_version = DatastoreVersion.load(datastore, version_id,
+                                              version=version_number)
     if datastore_version.datastore_id != datastore.id:
         raise exception.DatastoreNoVersion(datastore=datastore.name,
                                            version=datastore_version.name)
@@ -616,8 +628,8 @@ def update_datastore_version(datastore, name, manager, image_id, image_tags,
 
 class DatastoreVersionMetadata(object):
     @classmethod
-    def _datastore_version_find(cls, datastore_name,
-                                datastore_version_name):
+    def datastore_version_find(cls, datastore_name,
+                               datastore_version_name, version_number=None):
         """
         Helper to find a datastore version id for a given
         datastore and datastore version name.
@@ -626,17 +638,31 @@ class DatastoreVersionMetadata(object):
         db_ds_record = DBDatastore.find_by(
             name=datastore_name
         )
-        db_dsv_record = DBDatastoreVersion.find_by(
-            datastore_id=db_ds_record.id,
-            name=datastore_version_name
-        )
+
+        if not version_number:
+            db_dsv_records = DBDatastoreVersion.find_all(
+                datastore_id=db_ds_record.id,
+                name=datastore_version_name,
+            )
+            if db_dsv_records.count() == 0:
+                raise exception.DatastoreVersionNotFound(
+                    version=datastore_version_name)
+            if db_dsv_records.count() > 1:
+                raise exception.DatastoreVersionsNoUniqueMatch(
+                    name=datastore_version_name)
+
+            db_dsv_record = db_dsv_records.first()
+        else:
+            db_dsv_record = DBDatastoreVersion.find_by(
+                datastore_id=db_ds_record.id,
+                name=datastore_version_name,
+                version=version_number
+            )
 
         return db_dsv_record.id
 
     @classmethod
-    def _datastore_version_metadata_add(cls, datastore_name,
-                                        datastore_version_name,
-                                        datastore_version_id,
+    def _datastore_version_metadata_add(cls, datastore_version_id,
                                         key, value, exception_class):
         """
         Create a record of the specified key and value in the
@@ -657,8 +683,7 @@ class DatastoreVersionMetadata(object):
                 return
             else:
                 raise exception_class(
-                    datastore=datastore_name,
-                    datastore_version=datastore_version_name,
+                    datastore_version_id=datastore_version_id,
                     id=value)
         except exception.NotFound:
             pass
@@ -669,8 +694,7 @@ class DatastoreVersionMetadata(object):
             key=key, value=value)
 
     @classmethod
-    def _datastore_version_metadata_delete(cls, datastore_name,
-                                           datastore_version_name,
+    def _datastore_version_metadata_delete(cls, datastore_version_id,
                                            key, value, exception_class):
         """
         Delete a record of the specified key and value in the
@@ -679,11 +703,6 @@ class DatastoreVersionMetadata(object):
         # if an association does not exist, raise an exception
         # if a deleted association exists, raise an exception
         # if an un-deleted association exists, delete it
-
-        datastore_version_id = cls._datastore_version_find(
-            datastore_name,
-            datastore_version_name)
-
         try:
             db_record = DBDatastoreVersionMetadata.find_by(
                 datastore_version_id=datastore_version_id,
@@ -693,96 +712,69 @@ class DatastoreVersionMetadata(object):
                 return
             else:
                 raise exception_class(
-                    datastore=datastore_name,
-                    datastore_version=datastore_version_name,
+                    datastore_version_id=datastore_version_id,
                     id=value)
         except exception.ModelNotFoundError:
-            raise exception_class(datastore=datastore_name,
-                                  datastore_version=datastore_version_name,
+            raise exception_class(datastore_version_id=datastore_version_id,
                                   id=value)
 
     @classmethod
-    def add_datastore_version_flavor_association(cls, datastore_name,
-                                                 datastore_version_name,
+    def add_datastore_version_flavor_association(cls, datastore_version_id,
                                                  flavor_ids):
-        datastore_version_id = cls._datastore_version_find(
-            datastore_name,
-            datastore_version_name)
-
         for flavor_id in flavor_ids:
             cls._datastore_version_metadata_add(
-                datastore_name, datastore_version_name,
                 datastore_version_id, 'flavor', flavor_id,
                 exception.DatastoreFlavorAssociationAlreadyExists)
 
     @classmethod
-    def delete_datastore_version_flavor_association(cls, datastore_name,
-                                                    datastore_version_name,
+    def delete_datastore_version_flavor_association(cls, datastore_version_id,
                                                     flavor_id):
         cls._datastore_version_metadata_delete(
-            datastore_name, datastore_version_name, 'flavor', flavor_id,
+            datastore_version_id, 'flavor', flavor_id,
             exception.DatastoreFlavorAssociationNotFound)
 
     @classmethod
     def list_datastore_version_flavor_associations(cls, context,
-                                                   datastore_type,
                                                    datastore_version_id):
-        if datastore_type and datastore_version_id:
-            """
-            All nova flavors are permitted for a datastore_version unless
-            one or more entries are found in datastore_version_metadata,
-            in which case only those are permitted.
-            """
-            (datastore, datastore_version) = get_datastore_version(
-                type=datastore_type, version=datastore_version_id)
-            # If datastore_version_id and flavor key exists in the
-            # metadata table return all the associated flavors for
-            # that datastore version.
-            nova_flavors = create_nova_client(context).flavors.list()
-            bound_flavors = DBDatastoreVersionMetadata.find_all(
-                datastore_version_id=datastore_version.id,
-                key='flavor', deleted=False
-            )
-            if (bound_flavors.count() != 0):
-                bound_flavors = tuple(f.value for f in bound_flavors)
-                # Generate a filtered list of nova flavors
-                ds_nova_flavors = (f for f in nova_flavors
-                                   if f.id in bound_flavors)
-                associated_flavors = tuple(flavor_model(flavor=item)
-                                           for item in ds_nova_flavors)
-            else:
-                # Return all nova flavors if no flavor metadata found
-                # for datastore_version.
-                associated_flavors = tuple(flavor_model(flavor=item)
-                                           for item in nova_flavors)
-            return associated_flavors
+        """Get allowed flavors for a given datastore version.
+
+        All nova flavors are permitted for a datastore_version unless
+        one or more entries are found in datastore_version_metadata,
+        in which case only those are permitted.
+        """
+        nova_flavors = create_nova_client(context).flavors.list()
+        bound_flavors = DBDatastoreVersionMetadata.find_all(
+            datastore_version_id=datastore_version_id,
+            key='flavor', deleted=False
+        )
+        if (bound_flavors.count() != 0):
+            bound_flavors = tuple(f.value for f in bound_flavors)
+            # Generate a filtered list of nova flavors
+            ds_nova_flavors = (f for f in nova_flavors
+                               if f.id in bound_flavors)
+            associated_flavors = tuple(flavor_model(flavor=item)
+                                       for item in ds_nova_flavors)
         else:
-            msg = _("Specify both the datastore and datastore_version_id.")
-            raise exception.BadRequest(msg)
+            # Return all nova flavors if no flavor metadata found
+            # for datastore_version.
+            associated_flavors = tuple(flavor_model(flavor=item)
+                                       for item in nova_flavors)
+        return associated_flavors
 
     @classmethod
-    def add_datastore_version_volume_type_association(cls, datastore_name,
-                                                      datastore_version_name,
+    def add_datastore_version_volume_type_association(cls,
+                                                      datastore_version_id,
                                                       volume_type_names):
-        datastore_version_id = cls._datastore_version_find(
-            datastore_name,
-            datastore_version_name)
-
-        # the database record will contain
-        # datastore_version_id, 'volume_type', volume_type_name
         for volume_type_name in volume_type_names:
             cls._datastore_version_metadata_add(
-                datastore_name, datastore_version_name,
                 datastore_version_id, 'volume_type', volume_type_name,
                 exception.DatastoreVolumeTypeAssociationAlreadyExists)
 
     @classmethod
     def delete_datastore_version_volume_type_association(
-            cls, datastore_name,
-            datastore_version_name,
-            volume_type_name):
+            cls, datastore_version_id, volume_type_name):
         cls._datastore_version_metadata_delete(
-            datastore_name, datastore_version_name, 'volume_type',
+            datastore_version_id, 'volume_type',
             volume_type_name,
             exception.DatastoreVolumeTypeAssociationNotFound)
 
@@ -811,7 +803,7 @@ class DatastoreVersionMetadata(object):
         List the datastore associations for a given datastore and version.
         """
         if datastore_name and datastore_version_name:
-            datastore_version_id = cls._datastore_version_find(
+            datastore_version_id = cls.datastore_version_find(
                 datastore_name, datastore_version_name)
             return cls.list_datastore_version_volume_type_associations(
                 datastore_version_id)
@@ -820,17 +812,13 @@ class DatastoreVersionMetadata(object):
             raise exception.BadRequest(msg)
 
     @classmethod
-    def datastore_volume_type_associations_exist(cls,
-                                                 datastore_name,
-                                                 datastore_version_name):
-        return cls.list_datastore_volume_type_associations(
-            datastore_name,
-            datastore_version_name).count() > 0
+    def datastore_volume_type_associations_exist(cls, datastore_version_id):
+        return cls.list_datastore_version_volume_type_associations(
+            datastore_version_id).count() > 0
 
     @classmethod
     def allowed_datastore_version_volume_types(cls, context,
-                                               datastore_name,
-                                               datastore_version_name):
+                                               datastore_version_id):
         """
         List all allowed volume types for a given datastore and
         datastore version. If datastore version metadata is
@@ -838,59 +826,44 @@ class DatastoreVersionMetadata(object):
         allowed. If datastore version metadata is not provided
         then all volume types known to cinder are allowed.
         """
-        if datastore_name and datastore_version_name:
-            # first obtain the list in the dsvmetadata
-            datastore_version_id = cls._datastore_version_find(
-                datastore_name, datastore_version_name)
+        metadata = cls.list_datastore_version_volume_type_associations(
+            datastore_version_id)
 
-            metadata = cls.list_datastore_version_volume_type_associations(
-                datastore_version_id)
+        # then get the list of all volume types
+        all_volume_types = volume_type_models.VolumeTypes(context)
 
-            # then get the list of all volume types
-            all_volume_types = volume_type_models.VolumeTypes(context)
+        # if there's metadata: intersect,
+        # else, whatever cinder has.
+        if (metadata.count() != 0):
+            # the volume types from metadata first
+            ds_volume_types = tuple(f.value for f in metadata)
 
-            # if there's metadata: intersect,
-            # else, whatever cinder has.
-            if (metadata.count() != 0):
-                # the volume types from metadata first
-                ds_volume_types = tuple(f.value for f in metadata)
-
-                # Cinder volume type names are unique, intersect
-                allowed_volume_types = tuple(
-                    f for f in all_volume_types
-                    if ((f.name in ds_volume_types) or
-                        (f.id in ds_volume_types)))
-            else:
-                allowed_volume_types = tuple(all_volume_types)
-
-            return allowed_volume_types
+            # Cinder volume type names are unique, intersect
+            allowed_volume_types = tuple(
+                f for f in all_volume_types
+                if ((f.name in ds_volume_types) or
+                    (f.id in ds_volume_types)))
         else:
-            msg = _("Specify the datastore_name and datastore_version_name.")
-            raise exception.BadRequest(msg)
+            allowed_volume_types = tuple(all_volume_types)
+
+        return allowed_volume_types
 
     @classmethod
-    def validate_volume_type(cls, context, volume_type,
-                             datastore_name, datastore_version_name):
-        if cls.datastore_volume_type_associations_exist(
-                datastore_name, datastore_version_name):
+    def validate_volume_type(cls, context, volume_type, datastore_version_id):
+        if cls.datastore_volume_type_associations_exist(datastore_version_id):
             allowed = cls.allowed_datastore_version_volume_types(
-                context, datastore_name, datastore_version_name)
+                context, datastore_version_id)
             if len(allowed) == 0:
                 raise exception.DatastoreVersionNoVolumeTypes(
-                    datastore=datastore_name,
-                    datastore_version=datastore_version_name)
+                    datastore_version_id=datastore_version_id)
             if volume_type is None:
                 raise exception.DataStoreVersionVolumeTypeRequired(
-                    datastore=datastore_name,
-                    datastore_version=datastore_version_name)
+                    datastore_version_id=datastore_version_id)
 
             allowed_names = tuple(f.name for f in allowed)
-            for n in allowed_names:
-                LOG.debug("Volume Type: %s is allowed for datastore "
-                          "%s, version %s." %
-                          (n, datastore_name, datastore_version_name))
+            LOG.debug(f"Allowed volume types: {allowed_names}")
+
             if volume_type not in allowed_names:
                 raise exception.DatastoreVolumeTypeAssociationNotFound(
-                    datastore=datastore_name,
-                    version_id=datastore_version_name,
+                    datastore_version_id=datastore_version_id,
                     id=volume_type)
diff --git a/trove/datastore/service.py b/trove/datastore/service.py
index b9366690eb..ada7b4ad78 100644
--- a/trove/datastore/service.py
+++ b/trove/datastore/service.py
@@ -93,7 +93,7 @@ class DatastoreController(wsgi.Controller):
         context = req.environ[wsgi.CONTEXT_KEY]
         flavors = (models.DatastoreVersionMetadata.
                    list_datastore_version_flavor_associations(
-                       context, datastore, version_id))
+                       context, version_id))
         return wsgi.Result(flavor_views.FlavorsView(flavors, req).data(), 200)
 
     def list_associated_volume_types(self, req, tenant_id, datastore,
@@ -106,7 +106,7 @@ class DatastoreController(wsgi.Controller):
         context = req.environ[wsgi.CONTEXT_KEY]
         volume_types = (models.DatastoreVersionMetadata.
                         allowed_datastore_version_volume_types(
-                            context, datastore, version_id))
+                            context, version_id))
         return wsgi.Result(volume_type_view.VolumeTypesView(
             volume_types, req).data(), 200)
 
diff --git a/trove/instance/models.py b/trove/instance/models.py
index 01ae293828..80bef79d0e 100644
--- a/trove/instance/models.py
+++ b/trove/instance/models.py
@@ -1133,9 +1133,8 @@ class Instance(BuiltInstance):
             valid_flavors = tuple(f.value for f in bound_flavors)
             if flavor_id not in valid_flavors:
                 raise exception.DatastoreFlavorAssociationNotFound(
-                    datastore=datastore.name,
-                    datastore_version=datastore_version.name,
-                    flavor_id=flavor_id)
+                    datastore_version_id=datastore_version.id,
+                    id=flavor_id)
         try:
             flavor = nova_client.flavors.get(flavor_id)
         except nova_exceptions.NotFound:
@@ -1166,7 +1165,7 @@ class Instance(BuiltInstance):
                 volume_size = volume.size
 
             dvm.validate_volume_type(context, volume_type,
-                                     datastore.name, datastore_version.name)
+                                     datastore_version.id)
             validate_volume_size(volume_size)
             call_args['volume_type'] = volume_type
             call_args['volume_size'] = volume_size
@@ -1335,7 +1334,7 @@ class Instance(BuiltInstance):
                 nics, overrides, slave_of_id, cluster_config,
                 volume_type=volume_type, modules=module_list,
                 locality=locality, access=access,
-                ds_version=datastore_version.name)
+                ds_version=datastore_version.version)
 
             return SimpleInstance(context, db_info, service_status,
                                   root_password, locality=locality)
diff --git a/trove/instance/views.py b/trove/instance/views.py
index e0413c18aa..96d8c7960f 100644
--- a/trove/instance/views.py
+++ b/trove/instance/views.py
@@ -129,6 +129,8 @@ class InstanceDetailView(InstanceView):
         if self.instance.datastore_version:
             result['instance']['datastore']['version'] = \
                 self.instance.datastore_version.name
+            result['instance']['datastore']['version_number'] = \
+                self.instance.datastore_version.version
 
         if self.instance.fault:
             result['instance']['fault'] = self._build_fault_info()
diff --git a/trove/tests/api/datastores.py b/trove/tests/api/datastores.py
index af8197e5a9..fe911f63ea 100644
--- a/trove/tests/api/datastores.py
+++ b/trove/tests/api/datastores.py
@@ -161,13 +161,9 @@ class DatastoreVersions(object):
 
     @test
     def test_datastore_version_not_found(self):
-        try:
-            assert_raises(exceptions.NotFound,
-                          self.rd_client.datastore_versions.get,
-                          self.datastore_active.name, NAME)
-        except exceptions.BadRequest as e:
-            assert_equal(e.message,
-                         "Datastore version '%s' cannot be found." % NAME)
+        assert_raises(exceptions.BadRequest,
+                      self.rd_client.datastore_versions.get,
+                      self.datastore_active.name, NAME)
 
     @test
     def test_datastore_version_list_by_uuid(self):
diff --git a/trove/tests/api/instances.py b/trove/tests/api/instances.py
index c36b692ed2..643e120ee3 100644
--- a/trove/tests/api/instances.py
+++ b/trove/tests/api/instances.py
@@ -204,7 +204,7 @@ class CheckInstance(AttrCheck):
         if 'datastore' not in self.instance:
             self.fail("'datastore' not found in instance.")
         else:
-            allowed_attrs = ['type', 'version']
+            allowed_attrs = ['type', 'version', 'version_number']
             self.contains_allowed_attrs(
                 self.instance['datastore'], allowed_attrs,
                 msg="datastore")
@@ -714,18 +714,13 @@ class CreateInstanceFail(object):
         users = []
         datastore = CONFIG.dbaas_datastore
         datastore_version = "nonexistent"
-        try:
-            assert_raises(exceptions.NotFound,
-                          dbaas.instances.create, instance_name,
-                          instance_info.dbaas_flavor_href,
-                          volume, databases, users,
-                          datastore=datastore,
-                          datastore_version=datastore_version,
-                          nics=instance_info.nics)
-        except exceptions.BadRequest as e:
-            assert_equal(e.message,
-                         "Datastore version '%s' cannot be found." %
-                         datastore_version)
+        assert_raises(exceptions.BadRequest,
+                      dbaas.instances.create, instance_name,
+                      instance_info.dbaas_flavor_href,
+                      volume, databases, users,
+                      datastore=datastore,
+                      datastore_version=datastore_version,
+                      nics=instance_info.nics)
 
 
 @test(
diff --git a/trove/tests/unittests/datastore/base.py b/trove/tests/unittests/datastore/base.py
index bf38c09a7c..f543b77f2d 100644
--- a/trove/tests/unittests/datastore/base.py
+++ b/trove/tests/unittests/datastore/base.py
@@ -41,15 +41,15 @@ class TestDatastoreBase(trove_testtools.TestCase):
 
         datastore_models.update_datastore_version(
             cls.ds_name, cls.ds_version_name, "mysql", "", "", "", True)
-        DatastoreVersionMetadata.add_datastore_version_flavor_association(
-            cls.ds_name, cls.ds_version_name, [cls.flavor_id])
-        DatastoreVersionMetadata.add_datastore_version_volume_type_association(
-            cls.ds_name, cls.ds_version_name, [cls.volume_type])
-
         cls.datastore_version = DatastoreVersion.load(cls.datastore,
                                                       cls.ds_version_name)
         cls.test_id = cls.datastore_version.id
 
+        DatastoreVersionMetadata.add_datastore_version_flavor_association(
+            cls.datastore_version.id, [cls.flavor_id])
+        DatastoreVersionMetadata.add_datastore_version_volume_type_association(
+            cls.datastore_version.id, [cls.volume_type])
+
         cls.cap1 = Capability.create(cls.capability_name,
                                      cls.capability_desc, True)
         cls.cap2 = Capability.create(
diff --git a/trove/tests/unittests/datastore/test_datastore_version_metadata.py b/trove/tests/unittests/datastore/test_datastore_version_metadata.py
index 2574ef1084..964cab0dd5 100644
--- a/trove/tests/unittests/datastore/test_datastore_version_metadata.py
+++ b/trove/tests/unittests/datastore/test_datastore_version_metadata.py
@@ -57,48 +57,40 @@ class TestDatastoreVersionMetadata(TestDatastoreBase):
 
     def test_add_existing_flavor_associations(self):
         dsmetadata = datastore_models.DatastoreVersionMetadata
-        self.assertRaisesRegex(
+        self.assertRaises(
             exception.DatastoreFlavorAssociationAlreadyExists,
-            "Flavor %s is already associated with datastore %s version %s"
-            % (self.flavor_id, self.ds_name, self.ds_version_name),
             dsmetadata.add_datastore_version_flavor_association,
-            self.ds_name, self.ds_version_name, [self.flavor_id])
+            self.test_id, [self.flavor_id])
 
     def test_add_existing_volume_type_associations(self):
         dsmetadata = datastore_models.DatastoreVersionMetadata
         self.assertRaises(
             exception.DatastoreVolumeTypeAssociationAlreadyExists,
             dsmetadata.add_datastore_version_volume_type_association,
-            self.ds_name, self.ds_version_name, [self.volume_type])
+            self.test_id, [self.volume_type])
 
     def test_delete_nonexistent_flavor_mapping(self):
         dsmeta = datastore_models.DatastoreVersionMetadata
-        self.assertRaisesRegex(
+        self.assertRaises(
             exception.DatastoreFlavorAssociationNotFound,
-            "Flavor 2 is not supported for datastore %s version %s"
-            % (self.ds_name, self.ds_version_name),
             dsmeta.delete_datastore_version_flavor_association,
-            self.ds_name, self.ds_version_name, flavor_id=2)
+            self.test_id, flavor_id=2)
 
     def test_delete_nonexistent_volume_type_mapping(self):
         dsmeta = datastore_models.DatastoreVersionMetadata
         self.assertRaises(
             exception.DatastoreVolumeTypeAssociationNotFound,
             dsmeta.delete_datastore_version_volume_type_association,
-            self.ds_name, self.ds_version_name,
+            self.test_id,
             volume_type_name='some random thing')
 
     def test_delete_flavor_mapping(self):
         flavor_id = 2
         dsmetadata = datastore_models.DatastoreVersionMetadata
         dsmetadata.add_datastore_version_flavor_association(
-            self.ds_name,
-            self.ds_version_name,
-            [flavor_id])
+            self.test_id, [flavor_id])
         dsmetadata.delete_datastore_version_flavor_association(
-            self.ds_name,
-            self.ds_version_name,
-            flavor_id)
+            self.test_id, flavor_id)
         datastore = datastore_models.Datastore.load(self.ds_name)
         ds_version = datastore_models.DatastoreVersion.load(
             datastore,
@@ -108,27 +100,22 @@ class TestDatastoreVersionMetadata(TestDatastoreBase):
         self.assertTrue(mapping.deleted)
         # check update
         dsmetadata.add_datastore_version_flavor_association(
-            self.ds_name, self.ds_version_name, [flavor_id])
+            self.test_id, [flavor_id])
         mapping = datastore_models.DBDatastoreVersionMetadata.find_by(
             datastore_version_id=ds_version.id, value=flavor_id, key='flavor')
         self.assertFalse(mapping.deleted)
         # clear the mapping
         datastore_models.DatastoreVersionMetadata. \
-            delete_datastore_version_flavor_association(self.ds_name,
-                                                        self.ds_version_name,
+            delete_datastore_version_flavor_association(self.test_id,
                                                         flavor_id)
 
     def test_delete_volume_type_mapping(self):
         volume_type = 'this is bogus'
         dsmetadata = datastore_models.DatastoreVersionMetadata
         dsmetadata.add_datastore_version_volume_type_association(
-            self.ds_name,
-            self.ds_version_name,
-            [volume_type])
+            self.test_id, [volume_type])
         dsmetadata.delete_datastore_version_volume_type_association(
-            self.ds_name,
-            self.ds_version_name,
-            volume_type)
+            self.test_id, volume_type)
         datastore = datastore_models.Datastore.load(self.ds_name)
         ds_version = datastore_models.DatastoreVersion.load(
             datastore,
@@ -139,19 +126,17 @@ class TestDatastoreVersionMetadata(TestDatastoreBase):
         self.assertTrue(mapping.deleted)
         # check update
         dsmetadata.add_datastore_version_volume_type_association(
-            self.ds_name, self.ds_version_name, [volume_type])
+            self.test_id, [volume_type])
         mapping = datastore_models.DBDatastoreVersionMetadata.find_by(
             datastore_version_id=ds_version.id, value=volume_type,
             key='volume_type')
         self.assertFalse(mapping.deleted)
         # clear the mapping
         dsmetadata.delete_datastore_version_volume_type_association(
-            self.ds_name,
-            self.ds_version_name,
-            volume_type)
+            self.test_id, volume_type)
 
     @mock.patch.object(datastore_models.DatastoreVersionMetadata,
-                       '_datastore_version_find')
+                       'datastore_version_find')
     @mock.patch.object(datastore_models.DatastoreVersionMetadata,
                        'list_datastore_version_volume_type_associations')
     @mock.patch.object(clients, 'create_cinder_client')
@@ -179,7 +164,7 @@ class TestDatastoreVersionMetadata(TestDatastoreBase):
         mock_list.return_value = mock_trove_list_result
 
         return self.dsmetadata.allowed_datastore_version_volume_types(
-            None, 'ds', 'dsv')
+            None, self.random_uuid())
 
     def _assert_equal_types(self, test_dict, output_obj):
         self.assertEqual(test_dict.get('id'), output_obj.id)
diff --git a/trove/tests/unittests/instance/test_service.py b/trove/tests/unittests/instance/test_service.py
index 07444a4c6c..a38c62f57b 100644
--- a/trove/tests/unittests/instance/test_service.py
+++ b/trove/tests/unittests/instance/test_service.py
@@ -13,7 +13,9 @@
 #    limitations under the License.
 from unittest import mock
 
+from trove.common import cfg
 from trove.common import clients
+from trove.common import exception
 from trove.datastore import models as ds_models
 from trove.instance import models as ins_models
 from trove.instance import service
@@ -21,6 +23,8 @@ from trove.instance import service_status as srvstatus
 from trove.tests.unittests import trove_testtools
 from trove.tests.unittests.util import util
 
+CONF = cfg.CONF
+
 
 class TestInstanceController(trove_testtools.TestCase):
     @classmethod
@@ -37,7 +41,14 @@ class TestInstanceController(trove_testtools.TestCase):
             1)
         ds_models.update_datastore_version(
             cls.ds_name, 'test_image_tags', 'mysql', '', ['trove', 'mysql'],
-            '', 1)
+            '', 1, version='test_image_tags version')
+        ds_models.update_datastore_version(
+            cls.ds_name, 'test_version', 'mysql', '', ['trove'], '', 1,
+            version='version 1')
+        ds_models.update_datastore_version(
+            cls.ds_name, 'test_version', 'mysql', '', ['trove'], '', 1,
+            version='version 2')
+
         cls.ds_version_imageid = ds_models.DatastoreVersion.load(
             cls.ds, 'test_image_id')
         cls.ds_version_imagetags = ds_models.DatastoreVersion.load(
@@ -61,19 +72,22 @@ class TestInstanceController(trove_testtools.TestCase):
     @mock.patch('trove.instance.models.Instance.create')
     def test_create_by_ds_version_image_tags(self, mock_model_create,
                                              mock_create_client):
+        image_id = self.random_uuid()
         mock_glance_client = mock.MagicMock()
-        mock_glance_client.images.list.return_value = [
-            {'id': self.random_uuid()}]
+        mock_glance_client.images.list.return_value = [{'id': image_id}]
         mock_create_client.return_value = mock_glance_client
 
+        name = self.random_name(name='instance',
+                                prefix='TestInstanceController')
+        flavor = self.random_uuid()
         body = {
             'instance': {
-                'name': self.random_name(name='instance',
-                                         prefix='TestInstanceController'),
-                'flavorRef': self.random_uuid(),
+                'name': name,
+                'flavorRef': flavor,
                 'datastore': {
                     'type': self.ds_name,
-                    'version': self.ds_version_imagetags.name
+                    'version': self.ds_version_imagetags.name,
+                    'version_number': self.ds_version_imagetags.version
                 }
             }
         }
@@ -85,6 +99,40 @@ class TestInstanceController(trove_testtools.TestCase):
             sort='created_at:desc', limit=1
         )
 
+        mock_model_create.assert_called_once_with(
+            mock.ANY, name, flavor, image_id,
+            [], [],
+            mock.ANY, mock.ANY,
+            None, None, None, [], None, None,
+            replica_count=None, volume_type=None, modules=None, locality=None,
+            region_name=CONF.service_credentials.region_name, access=None
+        )
+        args = mock_model_create.call_args[0]
+        actual_ds_version = args[7]
+        self.assertEqual(self.ds_version_imagetags.name,
+                         actual_ds_version.name)
+        self.assertEqual(self.ds_version_imagetags.version,
+                         actual_ds_version.version)
+
+    def test_create_multiple_versions(self):
+        body = {
+            'instance': {
+                'name': self.random_name(name='instance',
+                                         prefix='TestInstanceController'),
+                'flavorRef': self.random_uuid(),
+                'datastore': {
+                    'type': self.ds_name,
+                    'version': 'test_version'
+                }
+            }
+        }
+
+        self.assertRaises(
+            exception.DatastoreVersionsNoUniqueMatch,
+            self.controller.create,
+            mock.MagicMock(), body, mock.ANY
+        )
+
     @mock.patch.object(clients, 'create_nova_client',
                        return_value=mock.MagicMock())
     @mock.patch('trove.rpc.get_client')