diff --git a/xCAT-server/lib/xcat/plugins/aixinstall.pm b/xCAT-server/lib/xcat/plugins/aixinstall.pm
index 67621d9b8..80f807f9e 100644
--- a/xCAT-server/lib/xcat/plugins/aixinstall.pm
+++ b/xCAT-server/lib/xcat/plugins/aixinstall.pm
@@ -125,8 +125,12 @@ sub preprocess_request
     # need for runcmd output
     $::CALLBACK = $cb;
 
-    # don't want preprocess to run on service node but _xcatdest is not set??
-    #if ($req->{_xcatdest}) { return [$req]; }    #exit if preprocessed
+    #if already preprocessed, go straight to request 
+    if (   (defined($req->{_xcatpreprocessed}))
+        && ($req->{_xcatpreprocessed}->[0] == 1))
+    {
+        return [$req];
+    }
 
     my $nodes   = $req->{node}; # this may not be the list of nodes we need!
     my $service = "xcat";
@@ -10393,8 +10397,8 @@ sub mkdsklsnode
                     $error++;
                 }
 
-                my $scmd = "exportfs -a";
-                my $output = xCAT::Utils->runcmd("$scmd", -1);
+                $scmd = "exportfs -a";
+                $output = xCAT::Utils->runcmd("$scmd", -1);
                 if ($::RUNCMD_RC != 0)
                 {
                     my $rsp;
@@ -13057,7 +13061,7 @@ sub update_spot_rpm
 		my $rsp;
 		push @{$rsp->{data}}, "The following RPM packages were already installed and were not reinstalled:\n";
 		xCAT::MsgUtils->message("W", $rsp, $callback);
-		my $rsp;
+		$rsp={};
 		foreach my $rpm (@dontinstall) {
             push @{$rsp->{data}}, "$rpm";
         }