diff --git a/xCAT-server/lib/xcat/plugins/sinv.pm b/xCAT-server/lib/xcat/plugins/sinv.pm
index 155554f92..eb50ab6a9 100644
--- a/xCAT-server/lib/xcat/plugins/sinv.pm
+++ b/xCAT-server/lib/xcat/plugins/sinv.pm
@@ -43,33 +43,6 @@ sub handled_commands
 =cut
 
 #-------------------------------------------------------
-#sub preprocess_request
-#{
-#    my $req = shift;
-#    my $cb  = shift;
-#    my %sn;
-#    my $sn;
-#    if ($req->{_xcatdest}) { return [$req]; }    #exit if preprocessed
-#    my $nodes   = $req->{node};
-#    my $service = "xcat";
-#    my @requests;
-#
-# find service nodes for requested nodes
-# build an individual request for each service node
-#    $sn = xCAT::Utils->get_ServiceNode($nodes, $service, "MN");
-
-# build each request for each service node
-
-#    foreach my $snkey (keys %$sn)
-#    {
-#        my $reqcopy = {%$req};
-#        $reqcopy->{node} = $sn->{$snkey};
-#        $reqcopy->{'_xcatdest'} = $snkey;
-#        push @requests, $reqcopy;
-
-#    }
-#    return \@requests;
-#}
 
 #-------------------------------------------------------