client.py

diff --git a/hpe3parclient/client.py b/hpe3parclient/client.py
index 7272f70..9ad988f 100644
--- a/hpe3parclient/client.py
+++ b/hpe3parclient/client.py
@@ -711,7 +711,7 @@ class HPE3ParClient(object):
         response, body = self.http.put('/volumes/%s' % name, body=info)
         return body
 
-    def copyVolume(self, src_name, dest_name, dest_cpg, optional=None):
+    def copyVolume(self, src_name, dest_name, dest_cpg=None, optional=None):
         """Copy/Clone a volume.
 
         :param src_name: the source volume name
@@ -829,6 +829,10 @@ class HPE3ParClient(object):
         if optional:
             parameters = self._mergeDict(parameters, optional)
 
+        if 'online' not in paramaters or parameters['online'] == False:
+            # 3Par won't allot destCPG to be set if it's not an online copy.
+            parameters.pop('destCPG', None)
+
         info = {'action': 'createPhysicalCopy',
                 'parameters': parameters}