diff --git a/nova/tests/test_xenapi.py b/nova/tests/test_xenapi.py
index ee8d5ae20471..b09bacc42f5b 100644
--- a/nova/tests/test_xenapi.py
+++ b/nova/tests/test_xenapi.py
@@ -789,6 +789,23 @@ class XenAPIMigrateInstance(test.TestCase):
         stubs.stubout_get_this_vm_uuid(self.stubs)
         glance_stubs.stubout_glance_client(self.stubs)
 
+    def test_resize_xenserver_6(self):
+        instance = db.instance_create(self.context, self.instance_values)
+        called = {'resize': False}
+
+        def fake_vdi_resize(*args, **kwargs):
+            called['resize'] = True
+
+        self.stubs.Set(stubs.FakeSessionForMigrationTests,
+                       "VDI_resize", fake_vdi_resize)
+        stubs.stubout_session(self.stubs,
+                              stubs.FakeSessionForMigrationTests,
+                              product_version=(6, 0, 0))
+        stubs.stubout_loopingcall_start(self.stubs)
+        conn = xenapi_conn.get_connection(False)
+        conn._vmops.resize_instance(instance, '')
+        self.assertEqual(called['resize'], True)
+
     def test_migrate_disk_and_power_off(self):
         instance = db.instance_create(self.context, self.instance_values)
         stubs.stubout_session(self.stubs, stubs.FakeSessionForMigrationTests)
diff --git a/nova/tests/xenapi/stubs.py b/nova/tests/xenapi/stubs.py
index c79bda6823d4..51ca78708b31 100644
--- a/nova/tests/xenapi/stubs.py
+++ b/nova/tests/xenapi/stubs.py
@@ -57,8 +57,8 @@ def stubout_instance_snapshot(stubs):
     stubs.Set(vm_utils, 'wait_for_vhd_coalesce', fake_wait_for_vhd_coalesce)
 
 
-def stubout_session(stubs, cls):
-    """Stubs out two methods from XenAPISession"""
+def stubout_session(stubs, cls, product_version=None):
+    """Stubs out three methods from XenAPISession"""
     def fake_import(self):
         """Stubs out get_imported_xenapi of XenAPISession"""
         fake_module = 'nova.virt.xenapi.fake'
@@ -69,6 +69,10 @@ def stubout_session(stubs, cls):
                        lambda s, url: cls(url))
     stubs.Set(xenapi_conn.XenAPISession, 'get_imported_xenapi',
                        fake_import)
+    if product_version is None:
+        product_version = (5, 6, 2)
+    stubs.Set(xenapi_conn.XenAPISession, 'get_product_version',
+            lambda s: product_version)
 
 
 def stub_out_get_target(stubs):
diff --git a/nova/virt/xenapi/fake.py b/nova/virt/xenapi/fake.py
index 91dc60ceeb0f..59ea19fd0dc3 100644
--- a/nova/virt/xenapi/fake.py
+++ b/nova/virt/xenapi/fake.py
@@ -441,6 +441,8 @@ class SessionBase(object):
     def VDI_resize_online(self, *args):
         return 'derp'
 
+    VDI_resize = VDI_resize_online
+
     def VM_clean_reboot(self, *args):
         return 'burp'
 
diff --git a/nova/virt/xenapi/vmops.py b/nova/virt/xenapi/vmops.py
index 4f53c8ab9833..5533b8cfd0b3 100644
--- a/nova/virt/xenapi/vmops.py
+++ b/nova/virt/xenapi/vmops.py
@@ -85,13 +85,14 @@ class VMOps(object):
     """
     Management class for VM-related tasks
     """
-    def __init__(self, session):
+    def __init__(self, session, product_version):
         self.XenAPI = session.get_imported_xenapi()
         self.compute_api = compute.API()
         self._session = session
         self.poll_rescue_last_ran = None
         VMHelper.XenAPI = self.XenAPI
         self.vif_driver = utils.import_object(FLAGS.xenapi_vif_driver)
+        self._product_version = product_version
 
     def list_instances(self):
         """List VM instances."""
@@ -768,7 +769,11 @@ class VMOps(object):
                         " GB") % locals())
             vdi_ref = self._session.call_xenapi('VDI.get_by_uuid', vdi_uuid)
             # for an instance with no local storage
-            self._session.call_xenapi('VDI.resize_online', vdi_ref,
+            if self._product_version[0] > 5:
+                resize_func_name = 'VDI.resize'
+            else:
+                resize_func_name = 'VDI.resize_online'
+            self._session.call_xenapi(resize_func_name, vdi_ref,
                     str(new_disk_size))
             LOG.debug(_("Resize instance %s complete") % (instance.name))
 
diff --git a/nova/virt/xenapi_conn.py b/nova/virt/xenapi_conn.py
index ab9c3e3683b6..73d1b0cb72d7 100644
--- a/nova/virt/xenapi_conn.py
+++ b/nova/virt/xenapi_conn.py
@@ -169,9 +169,10 @@ class XenAPIConnection(driver.ComputeDriver):
     def __init__(self, url, user, pw):
         super(XenAPIConnection, self).__init__()
         self._session = XenAPISession(url, user, pw)
-        self._vmops = VMOps(self._session)
         self._volumeops = VolumeOps(self._session)
         self._host_state = None
+        self._product_version = self._session.get_product_version()
+        self._vmops = VMOps(self._session, self._product_version)
 
     @property
     def host_state(self):
@@ -455,6 +456,14 @@ class XenAPISession(object):
                 session.login_with_password(user, pw)
             self._sessions.put(session)
 
+    def get_product_version(self):
+        """Return a tuple of (major, minor, rev) for the host version"""
+        host = self.get_xenapi_host()
+        software_version = self.call_xenapi('host.get_software_version',
+                                            host)
+        product_version = software_version['product_version']
+        return tuple(int(part) for part in product_version.split('.'))
+
     def get_imported_xenapi(self):
         """Stubout point. This can be replaced with a mock xenapi module."""
         return __import__('XenAPI')