diff --git a/TestON/tests/SCPF/SCPFscaleTopo/dependencies/scaleTopoFunction.py b/TestON/tests/SCPF/SCPFscaleTopo/dependencies/scaleTopoFunction.py
index 7620354..964f0c2 100644
--- a/TestON/tests/SCPF/SCPFscaleTopo/dependencies/scaleTopoFunction.py
+++ b/TestON/tests/SCPF/SCPFscaleTopo/dependencies/scaleTopoFunction.py
@@ -70,6 +70,9 @@
     except IndexError:
         main.log.error( "Got wrong role request string from Tshark file" )
         return -1
+    except ValueError:
+        main.log.error( "Got wrong string from log" )
+        return -1
 
 
 def compareTimeDiffWithRoleRequest( main, term, Mode, index=0 ):
@@ -93,7 +96,9 @@
         main.log.error( "Catch the wrong information of search term " )
         main.writeData = -1
         return -1
-
+    except ValueError:
+        main.log.error( "Got wrong string from log" )
+        return -1
 
 def getInfoFromLog( main, term1, mode1, term2, mode2, index=0, funcMode='TD' ):
     """
@@ -139,7 +144,9 @@
         main.log.error( "Catch the wrong information of search term" )
         main.writeData = -1
         return -1
-
+    except ValueError:
+        main.log.error( "Got wrong string from log" )
+        return -1
 
 def testTopology( main, topoFile='', args='', mnCmd='', timeout=300, clean=True ):
     """
diff --git a/TestON/tests/SCPF/SCPFscaleTopo/dependencies/topo.py b/TestON/tests/SCPF/SCPFscaleTopo/dependencies/topo.py
index 373ed2b..4476dfd 100644
--- a/TestON/tests/SCPF/SCPFscaleTopo/dependencies/topo.py
+++ b/TestON/tests/SCPF/SCPFscaleTopo/dependencies/topo.py
@@ -37,14 +37,15 @@
     if isinstance( hostList, list ):
         for h in hostList:
             main.Mininet1.arping( srcHost=h, dstHost="10.0.0.1", output=main.FALSE, noResult=True )
-            time.sleep( 0.5 )
     else:
         main.Mininet1.arping( srcHost=hostList, dstHost="10.0.0.1", output=main.FALSE, noResult=True )
+
+def getHostNum( main ):
     try:
         summaryStr = ""
         summaryStr = json.loads( main.Cluster.active( 0 ).CLI.summary().encode() )
         hostNum = summaryStr.get( 'hosts' )
-
+        main.log.info( "host nums from ONOS : " + str( hostNum ) )
     except ( TypeError, ValueError ):
         main.log.exception( " Object not as expected: {!r}".format( summaryStr ) )
         return -1