diff --git a/lib/rapi/client.py b/lib/rapi/client.py
index 10f19758ccfecd5e607a2fd2e5a289e6a548cc96..f1a157d3a1b78ac7e5577bf513a3d8607621426a 100644
--- a/lib/rapi/client.py
+++ b/lib/rapi/client.py
@@ -675,82 +675,8 @@ class GanetiRapiClient(object): # pylint: disable-msg=R0904
       body.update((key, value) for key, value in kwargs.iteritems()
                   if key != "dry_run")
     else:
-      # Old request format (version 0)
-
-      # The following code must make sure that an exception is raised when an
-      # unsupported setting is requested by the caller. Otherwise this can lead
-      # to bugs difficult to find. The interface of this function must stay
-      # exactly the same for version 0 and 1 (e.g. they aren't allowed to
-      # require different data types).
-
-      # Validate disks
-      for idx, disk in enumerate(disks):
-        unsupported = set(disk.keys()) - _INST_CREATE_V0_DISK_PARAMS
-        if unsupported:
-          raise GanetiApiError("Server supports request version 0 only, but"
-                               " disk %s specifies the unsupported parameters"
-                               " %s, allowed are %s" %
-                               (idx, unsupported,
-                                list(_INST_CREATE_V0_DISK_PARAMS)))
-
-      assert (len(_INST_CREATE_V0_DISK_PARAMS) == 1 and
-              "size" in _INST_CREATE_V0_DISK_PARAMS)
-      disk_sizes = [disk["size"] for disk in disks]
-
-      # Validate NICs
-      if not nics:
-        raise GanetiApiError("Server supports request version 0 only, but"
-                             " no NIC specified")
-      elif len(nics) > 1:
-        raise GanetiApiError("Server supports request version 0 only, but"
-                             " more than one NIC specified")
-
-      assert len(nics) == 1
-
-      unsupported = set(nics[0].keys()) - _INST_NIC_PARAMS
-      if unsupported:
-        raise GanetiApiError("Server supports request version 0 only, but"
-                             " NIC 0 specifies the unsupported parameters %s,"
-                             " allowed are %s" %
-                             (unsupported, list(_INST_NIC_PARAMS)))
-
-      # Validate other parameters
-      unsupported = (set(kwargs.keys()) - _INST_CREATE_V0_PARAMS -
-                     _INST_CREATE_V0_DPARAMS)
-      if unsupported:
-        allowed = _INST_CREATE_V0_PARAMS.union(_INST_CREATE_V0_DPARAMS)
-        raise GanetiApiError("Server supports request version 0 only, but"
-                             " the following unsupported parameters are"
-                             " specified: %s, allowed are %s" %
-                             (unsupported, list(allowed)))
-
-      # All required fields for request data version 0
-      body = {
-        _REQ_DATA_VERSION_FIELD: 0,
-        "name": name,
-        "disk_template": disk_template,
-        "disks": disk_sizes,
-        }
-
-      # NIC fields
-      assert len(nics) == 1
-      assert not (set(body.keys()) & set(nics[0].keys()))
-      body.update(nics[0])
-
-      # Copy supported fields
-      assert not (set(body.keys()) & set(kwargs.keys()))
-      body.update(dict((key, value) for key, value in kwargs.items()
-                       if key in _INST_CREATE_V0_PARAMS))
-
-      # Merge dictionaries
-      for i in (value for key, value in kwargs.items()
-                if key in _INST_CREATE_V0_DPARAMS):
-        assert not (set(body.keys()) & set(i.keys()))
-        body.update(i)
-
-      assert not (set(kwargs.keys()) -
-                  (_INST_CREATE_V0_PARAMS | _INST_CREATE_V0_DPARAMS))
-      assert not (set(body.keys()) & _INST_CREATE_V0_DPARAMS)
+      raise GanetiApiError("Server does not support new-style (version 1)"
+                           " instance creation requests")
 
     return self._SendRequest(HTTP_POST, "/%s/instances" % GANETI_RAPI_VERSION,
                              query, body)
diff --git a/test/ganeti.rapi.client_unittest.py b/test/ganeti.rapi.client_unittest.py
index 9c41b08dd511d736852e3f8d5d83102e76fc49d4..3f9f2b8f6208e9c154a6c3056b1373f70e587a11 100755
--- a/test/ganeti.rapi.client_unittest.py
+++ b/test/ganeti.rapi.client_unittest.py
@@ -510,92 +510,12 @@ class GanetiRapiClientTests(testutils.GanetiTestCase):
     self.assertQuery("static", ["1"])
 
   def testCreateInstanceOldVersion(self):
-    # No NICs
+    # The old request format, version 0, is no longer supported
     self.rapi.AddResponse(None, code=404)
     self.assertRaises(client.GanetiApiError, self.client.CreateInstance,
                       "create", "inst1.example.com", "plain", [], [])
     self.assertEqual(self.rapi.CountPending(), 0)
 
-    # More than one NIC
-    self.rapi.AddResponse(None, code=404)
-    self.assertRaises(client.GanetiApiError, self.client.CreateInstance,
-                      "create", "inst1.example.com", "plain", [],
-                      [{}, {}, {}])
-    self.assertEqual(self.rapi.CountPending(), 0)
-
-    # Unsupported NIC fields
-    self.rapi.AddResponse(None, code=404)
-    self.assertRaises(client.GanetiApiError, self.client.CreateInstance,
-                      "create", "inst1.example.com", "plain", [],
-                      [{"x": True, "y": False}])
-    self.assertEqual(self.rapi.CountPending(), 0)
-
-    # Unsupported disk fields
-    self.rapi.AddResponse(None, code=404)
-    self.assertRaises(client.GanetiApiError, self.client.CreateInstance,
-                      "create", "inst1.example.com", "plain",
-                      [{}, {"moo": "foo",}], [{}])
-    self.assertEqual(self.rapi.CountPending(), 0)
-
-    # Unsupported fields
-    self.rapi.AddResponse(None, code=404)
-    self.assertRaises(client.GanetiApiError, self.client.CreateInstance,
-                      "create", "inst1.example.com", "plain", [], [{}],
-                      hello_world=123)
-    self.assertEqual(self.rapi.CountPending(), 0)
-
-    self.rapi.AddResponse(None, code=404)
-    self.assertRaises(client.GanetiApiError, self.client.CreateInstance,
-                      "create", "inst1.example.com", "plain", [], [{}],
-                      memory=128)
-    self.assertEqual(self.rapi.CountPending(), 0)
-
-    # Normal creation
-    testnics = [
-      [{}],
-      [{ "mac": constants.VALUE_AUTO, }],
-      [{ "ip": "192.0.2.99", "mode": constants.NIC_MODE_ROUTED, }],
-      ]
-
-    testdisks = [
-      [],
-      [{ "size": 128, }],
-      [{ "size": 321, }, { "size": 4096, }],
-      ]
-
-    for idx, nics in enumerate(testnics):
-      for disks in testdisks:
-        beparams = {
-          constants.BE_MEMORY: 512,
-          constants.BE_AUTO_BALANCE: False,
-          }
-        hvparams = {
-          constants.HV_MIGRATION_PORT: 9876,
-          constants.HV_VNC_TLS: True,
-          }
-
-        self.rapi.AddResponse(None, code=404)
-        self.rapi.AddResponse(serializer.DumpJson(3122617 + idx))
-        job_id = self.client.CreateInstance("create", "inst1.example.com",
-                                            "plain", disks, nics,
-                                            pnode="node99", dry_run=True,
-                                            hvparams=hvparams,
-                                            beparams=beparams)
-        self.assertEqual(job_id, 3122617 + idx)
-        self.assertHandler(rlib2.R_2_instances)
-        self.assertDryRun()
-        self.assertEqual(self.rapi.CountPending(), 0)
-
-        data = serializer.LoadJson(self.rapi.GetLastRequestData())
-        self.assertEqual(data["name"], "inst1.example.com")
-        self.assertEqual(data["disk_template"], "plain")
-        self.assertEqual(data["pnode"], "node99")
-        self.assertEqual(data[constants.BE_MEMORY], 512)
-        self.assertEqual(data[constants.BE_AUTO_BALANCE], False)
-        self.assertEqual(data[constants.HV_MIGRATION_PORT], 9876)
-        self.assertEqual(data[constants.HV_VNC_TLS], True)
-        self.assertEqual(data["disks"], [disk["size"] for disk in disks])
-
   def testCreateInstance(self):
     self.rapi.AddResponse(serializer.DumpJson([rlib2._INST_CREATE_REQV1]))
     self.rapi.AddResponse("23030")