diff --git a/xCAT-server/xCAT-server.spec b/xCAT-server/xCAT-server.spec
index 23e102cdf..291347e93 100644
--- a/xCAT-server/xCAT-server.spec
+++ b/xCAT-server/xCAT-server.spec
@@ -148,10 +148,22 @@ else
 fi
 if [ "$1" -gt "1" ]; then #only on upgrade...
   if [ -f "/proc/cmdline" ]; then   # prevent running it during install into chroot image
-    XCATROOT=$RPM_INSTALL_PREFIX0 $RPM_INSTALL_PREFIX0/sbin/chtab filename=monitorctrl.pm notification -d #migration issue for monitoring
+    #migration issue for monitoring
+    XCATROOT=$RPM_INSTALL_PREFIX0 $RPM_INSTALL_PREFIX0/sbin/chtab filename=monitorctrl.pm notification -d
     /etc/init.d/xcatd restart
   fi
 fi
+%else
+if [ "$1" -gt "1" ]; then #only on upgrade for AIX...
+    #migration issue for monitoring
+    XCATROOT=$RPM_INSTALL_PREFIX0 $RPM_INSTALL_PREFIX0/sbin/chtab filename=monitorctrl.pm notification -d 
+    #restart the xcatd
+    pids=`ps xww |grep xcatd|grep -v grep|cut -c1-7`
+    if [ ! -z "$pids" ]; then
+      kill $pids
+    fi
+    $XCATROOT/sbin/xcatd&
+fi  
 %endif
 
 %preun