diff --git a/xCAT-server-2.0/lib/xcat/plugins/DHCPsn.pm b/xCAT-server-2.0/lib/xcat/plugins/DHCPsn.pm
index d92a54d93..9d78d9e2c 100644
--- a/xCAT-server-2.0/lib/xcat/plugins/DHCPsn.pm
+++ b/xCAT-server-2.0/lib/xcat/plugins/DHCPsn.pm
@@ -43,6 +43,10 @@ sub handled_commands
 
             # service needed on this Service Node
             $rc = &setup_DHCP($nodename);    # setup DHCP
+            if ($rc == 0)
+            {
+                xCAT::Utils->update_xCATSN($service);
+            }
         }
     }
     return $rc;
@@ -113,7 +117,6 @@ sub setup_DHCP
     {    # error reading Db
         $rc = 1;
     }
-    xCAT::Utils->update_xCATSN("dhcp");
     return $rc;
 }
 1;
diff --git a/xCAT-server-2.0/lib/xcat/plugins/DNSsn.pm b/xCAT-server-2.0/lib/xcat/plugins/DNSsn.pm
index be85985af..723aba429 100644
--- a/xCAT-server-2.0/lib/xcat/plugins/DNSsn.pm
+++ b/xCAT-server-2.0/lib/xcat/plugins/DNSsn.pm
@@ -29,7 +29,7 @@ Call  setup_DNS
 
 sub handled_commands
 {
-    my $rc=0;
+    my $rc = 0;
     if (xCAT::Utils->isServiceNode())
     {
         my @nodeinfo   = xCAT::Utils->determinehostname;
@@ -43,6 +43,10 @@ sub handled_commands
 
             # service needed on this Service Node
             $rc = &setup_DNS($nodename);    # setup DNS
+            if ($rc == 0)
+            {
+                xCAT::Utils->update_xCATSN($service);
+            }
         }
     }
     return $rc;
@@ -166,11 +170,10 @@ sub setup_DNS
             `cp /etc/named.conf /var/named/chroot/etc`;
             `chkconfig --level 345 named on`;
             `service named restart`;
-             xCAT::Utils->update_xCATSN("dns"); 
         }
     }
     else
-    {                                       # error reading DB
+    {    # error reading DB
         return 1;
     }
     return 0;
diff --git a/xCAT-server-2.0/lib/xcat/plugins/NFSsn.pm b/xCAT-server-2.0/lib/xcat/plugins/NFSsn.pm
index ade9d7b85..c28b75182 100644
--- a/xCAT-server-2.0/lib/xcat/plugins/NFSsn.pm
+++ b/xCAT-server-2.0/lib/xcat/plugins/NFSsn.pm
@@ -21,7 +21,8 @@ use Getopt::Long;
 =head3  handled_commands 
 
 Check to see if on a Service Node
-This will be setup all the time on Service Nodes
+Check database to see if this node is a NFS server
+   should be always
 Call  setup_NFS
 
 =cut
@@ -37,9 +38,18 @@ sub handled_commands
         my @nodeinfo   = xCAT::Utils->determinehostname;
         my $nodename   = $nodeinfo[0];
         my $nodeipaddr = $nodeinfo[1];
+        my $service    = "nfsserver";
+        $rc = xCAT::Utils->isServiceReq($nodename, $service, $nodeipaddr);
+        if ($rc == 1)
+        {
 
-        # service needed on this Service Node
-        $rc = &setup_NFS($nodename);    # setup NFS
+            # service needed on this Service Node
+            $rc = &setup_NFS($nodename);    # setup NFS
+            if ($rc == 0)
+            {
+                xCAT::Utils->update_xCATSN($service);
+            }
+        }
     }
     return $rc;
 }
@@ -220,7 +230,6 @@ sub setup_NFS
         {
             `echo "$master:$installdir $installdir nfs timeo=14,intr 1 2" >>/etc/fstab`;
         }
-			xCAT::Utils->update_xCATSN("nfs");
     }
     return $rc;
 }
diff --git a/xCAT-server-2.0/lib/xcat/plugins/TFTPsn.pm b/xCAT-server-2.0/lib/xcat/plugins/TFTPsn.pm
index 284b14cf9..fdaebe55e 100644
--- a/xCAT-server-2.0/lib/xcat/plugins/TFTPsn.pm
+++ b/xCAT-server-2.0/lib/xcat/plugins/TFTPsn.pm
@@ -42,7 +42,11 @@ sub handled_commands
         {
 
             # service needed on this Service Node
-            $rc=&setup_TFTP($nodename);    # setup TFTP
+            $rc = &setup_TFTP($nodename);    # setup TFTP
+            if ($rc == 0)
+            {
+                xCAT::Utils->update_xCATSN($service);
+            }
         }
     }
     return $rc;
@@ -104,8 +108,7 @@ sub setup_TFTP
     if (xCAT::Utils->isLinux())
     {
 
-        # enable tftp 
-
+        # enable tftp
 
         my $cmd = "chkconfig tftp on";
         xCAT::Utils->runcmd($cmd, -1);
@@ -129,7 +132,6 @@ sub setup_TFTP
         # TBD AIX  tftp may already be enabled
 
     }
-	xCAT::Utils->update_xCATSN("tftp");
- return 0;
+    return 0;
 }
 1;