diff --git a/plstackapi/openstack/manager.py b/plstackapi/openstack/manager.py
index 0049c8c..220d491 100644
--- a/plstackapi/openstack/manager.py
+++ b/plstackapi/openstack/manager.py
@@ -172,7 +172,7 @@
             self.driver.delete_subnet(subnet.subnet_id)
             #del_route = 'route del -net %s' % self.cidr
             #commands.getstatusoutput(del_route)
-    
+
     @require_enabled
     def save_sliver(self, sliver):
         if not sliver.instance_id:
@@ -183,6 +183,9 @@
             sliver.instance_id = instance.id
             sliver.instance_name = getattr(instance, 'OS-EXT-SRV-ATTR:instance_name')
 
+        if sliver.instance_id:
+            self.driver.update_instance_metadata(sliver.instance_id, {"cpu_cores": str(sliver.numberCores)})
+
     @require_enabled
     def delete_sliver(self, sliver):
         if sliver.instance_id: