diff --git a/client-api/api_lib/pvcapi_provisioner.py b/client-api/api_lib/pvcapi_provisioner.py
index 9f3705d9..76119452 100755
--- a/client-api/api_lib/pvcapi_provisioner.py
+++ b/client-api/api_lib/pvcapi_provisioner.py
@@ -282,7 +282,7 @@ def create_template_storage(name):
     close_database(conn, cur)
     return retmsg, retcode
 
-def create_template_storage_element(name, disk_id, pool, disk_size_gb, filesystem=None, filesystem_args=[], mountpoint=None):
+def create_template_storage_element(name, disk_id, pool, source_volume=None, disk_size_gb=None, filesystem=None, filesystem_args=[], mountpoint=None):
     if not list_template_storage(name, is_fuzzy=False):
         retmsg = { 'message': 'The storage template "{}" does not exist'.format(name) }
         retcode = 400
@@ -303,14 +303,19 @@ def create_template_storage_element(name, disk_id, pool, disk_size_gb, filesyste
         retcode = 400
         return retmsg, retcode
 
+    if source_volume and (disk_size_gb or filesystem or mountpoint):
+        retmsg = { "message": "Clone volumes are not compatible with disk size, filesystem, or mountpoint specifications." }
+        retcode = 400
+        return retmsg, retcode
+
     conn, cur = open_database(config)
     try:
         query = "SELECT id FROM storage_template WHERE name = %s;"
         args = (name,)
         cur.execute(query, args)
         template_id = cur.fetchone()['id']
-        query = "INSERT INTO storage (storage_template, pool, disk_id, disk_size_gb, mountpoint, filesystem, filesystem_args) VALUES (%s, %s, %s, %s, %s, %s, %s);"
-        args = (template_id, pool, disk_id, disk_size_gb, mountpoint, filesystem, ' '.join(filesystem_args))
+        query = "INSERT INTO storage (storage_template, pool, disk_id, source_volume, disk_size_gb, mountpoint, filesystem, filesystem_args) VALUES (%s, %s, %s, %s, %s, %s, %s, %s);"
+        args = (template_id, pool, disk_id, source_volume, disk_size_gb, mountpoint, filesystem, ' '.join(filesystem_args))
         cur.execute(query, args)
         retmsg = { 'message': 'Added new disk "{}" to storage template "{}"'.format(disk_id, name) }
         retcode = 200
diff --git a/client-api/pvc-api.py b/client-api/pvc-api.py
index 1a306802..2cf1d50b 100755
--- a/client-api/pvc-api.py
+++ b/client-api/pvc-api.py
@@ -4359,7 +4359,8 @@ class API_Provisioner_Template_Storage_Disk_Root(Resource):
     @RequestParser([
         { 'name': 'disk_id', 'required': True, 'helpmsg': "A disk identifier in sdX or vdX format must be specified" },
         { 'name': 'pool', 'required': True, 'helpmsg': "A storage pool must be specified" },
-        { 'name': 'disk_size', 'required': True, 'helpmsg': "A disk size in GB must be specified" },
+        { 'name': 'source_volume' },
+        { 'name': 'disk_size' },
         { 'name': 'filesystem' },
         { 'name': 'filesystem_arg', 'action': 'append' },
         { 'name': 'mountpoint' }
@@ -4382,16 +4383,21 @@ class API_Provisioner_Template_Storage_Disk_Root(Resource):
             type: string
             required: true
             description: ceph storage pool for disk
+          - in: query
+            name: source_volume
+            type: string
+            required: false
+            description: Source storage volume; not compatible with other options
           - in: query
             name: disk_size
             type: integer
-            required: true
-            description: Disk size in GB
+            required: false
+            description: Disk size in GB; not compatible with source_volume
           - in: query
             name: filesystem
             type: string
             required: false
-            description: Filesystem for disk
+            description: Filesystem for disk; not compatible with source_volume
           - in: query
             name: filesystem_arg
             type: string
@@ -4401,7 +4407,7 @@ class API_Provisioner_Template_Storage_Disk_Root(Resource):
             name: mountpoint
             type: string
             required: false
-            description: In-VM mountpoint for disk
+            description: In-VM mountpoint for disk; not compatible with source_volume
         responses:
           200:
             description: OK
@@ -4418,6 +4424,7 @@ class API_Provisioner_Template_Storage_Disk_Root(Resource):
             template,
             reqargs.get('disk_id', None),
             reqargs.get('pool', None),
+            reqargs.get('source_volume', None),
             reqargs.get('disk_size', None),
             reqargs.get('filesystem', None),
             reqargs.get('filesystem_arg', []),
@@ -4456,7 +4463,8 @@ class API_Provisioner_Template_Storage_Disk_Element(Resource):
 
     @RequestParser([
         { 'name': 'pool', 'required': True, 'helpmsg': "A storage pool must be specified" },
-        { 'name': 'disk_size', 'required': True, 'helpmsg': "A disk size in GB must be specified" },
+        { 'name': 'source_volume' },
+        { 'name': 'disk_size' },
         { 'name': 'filesystem' },
         { 'name': 'filesystem_arg', 'action': 'append' },
         { 'name': 'mountpoint' }
@@ -4475,16 +4483,21 @@ class API_Provisioner_Template_Storage_Disk_Element(Resource):
             type: string
             required: true
             description: ceph storage pool for disk
+          - in: query
+            name: source_volume
+            type: string
+            required: false
+            description: Source storage volume; not compatible with other options
           - in: query
             name: disk_size
             type: integer
-            required: true
-            description: Disk size in GB
+            required: false
+            description: Disk size in GB; not compatible with source_volume
           - in: query
             name: filesystem
             type: string
             required: false
-            description: Filesystem for disk
+            description: Filesystem for disk; not compatible with source_volume
           - in: query
             name: filesystem_arg
             type: string
@@ -4494,7 +4507,7 @@ class API_Provisioner_Template_Storage_Disk_Element(Resource):
             name: mountpoint
             type: string
             required: false
-            description: In-VM mountpoint for disk
+            description: In-VM mountpoint for disk; not compatible with source_volume
         responses:
           200:
             description: OK
@@ -4511,6 +4524,7 @@ class API_Provisioner_Template_Storage_Disk_Element(Resource):
             template,
             disk_id,
             reqargs.get('pool', None),
+            reqargs.get('source_volume', None),
             reqargs.get('disk_size', None),
             reqargs.get('filesystem', None),
             reqargs.get('filesystem_arg', []),
diff --git a/docs/manuals/swagger.json b/docs/manuals/swagger.json
index 1610bc56..5f695bc4 100644
--- a/docs/manuals/swagger.json
+++ b/docs/manuals/swagger.json
@@ -2963,14 +2963,21 @@
                         "type": "string"
                     },
                     {
-                        "description": "Disk size in GB",
+                        "description": "Source storage volume; not compatible with other options",
+                        "in": "query",
+                        "name": "source_volume",
+                        "required": false,
+                        "type": "string"
+                    },
+                    {
+                        "description": "Disk size in GB; not compatible with source_volume",
                         "in": "query",
                         "name": "disk_size",
-                        "required": true,
+                        "required": false,
                         "type": "integer"
                     },
                     {
-                        "description": "Filesystem for disk",
+                        "description": "Filesystem for disk; not compatible with source_volume",
                         "in": "query",
                         "name": "filesystem",
                         "required": false,
@@ -2984,7 +2991,7 @@
                         "type": "string"
                     },
                     {
-                        "description": "In-VM mountpoint for disk",
+                        "description": "In-VM mountpoint for disk; not compatible with source_volume",
                         "in": "query",
                         "name": "mountpoint",
                         "required": false,
@@ -3065,14 +3072,21 @@
                         "type": "string"
                     },
                     {
-                        "description": "Disk size in GB",
+                        "description": "Source storage volume; not compatible with other options",
+                        "in": "query",
+                        "name": "source_volume",
+                        "required": false,
+                        "type": "string"
+                    },
+                    {
+                        "description": "Disk size in GB; not compatible with source_volume",
                         "in": "query",
                         "name": "disk_size",
-                        "required": true,
+                        "required": false,
                         "type": "integer"
                     },
                     {
-                        "description": "Filesystem for disk",
+                        "description": "Filesystem for disk; not compatible with source_volume",
                         "in": "query",
                         "name": "filesystem",
                         "required": false,
@@ -3086,7 +3100,7 @@
                         "type": "string"
                     },
                     {
-                        "description": "In-VM mountpoint for disk",
+                        "description": "In-VM mountpoint for disk; not compatible with source_volume",
                         "in": "query",
                         "name": "mountpoint",
                         "required": false,