diff --git a/perl-xCAT/xCAT/Utils.pm b/perl-xCAT/xCAT/Utils.pm
index 078d2dc1f..e0cee8e67 100644
--- a/perl-xCAT/xCAT/Utils.pm
+++ b/perl-xCAT/xCAT/Utils.pm
@@ -3509,6 +3509,9 @@ sub create_postscripts_tar
 
 sub get_site_Master
 {
+    if ($::XCATSITEVALS{$master}) {
+        return $::XCATSITEVALS{$master};
+    }
     require xCAT::Table;
     my $Master;
     my $sitetab = xCAT::Table->new('site');
diff --git a/perl-xCAT/xCAT/VMCommon.pm b/perl-xCAT/xCAT/VMCommon.pm
index 205d67f8f..e146fd16b 100644
--- a/perl-xCAT/xCAT/VMCommon.pm
+++ b/perl-xCAT/xCAT/VMCommon.pm
@@ -10,8 +10,8 @@ sub grab_table_data{ #grab table data relevent to VM guest nodes
   my $vpdtab = xCAT::Table->new("vpd");
   my $hmtab = xCAT::Table->new("nodehm");
   my $nttab = xCAT::Table->new("nodetype");
-  my $sitetab = xCAT::Table->new("site");
-  $cfghash->{site}->{genmacprefix} = xCAT::Utils->get_site_attribute('genmacprefix');
+  #my $sitetab = xCAT::Table->new("site");
+  $cfghash->{site}->{genmacprefix} = $::XCATSITEVALS{genmacprefix}; #xCAT::Utils->get_site_attribute('genmacprefix');
   if ($hmtab) {
       $cfghash->{nodehm}  = $hmtab->getNodesAttribs($noderange,['serialspeed']);
   }
diff --git a/xCAT-server/lib/xcat/plugins/kvm.pm b/xCAT-server/lib/xcat/plugins/kvm.pm
index 256b31039..2f34c3d49 100644
--- a/xCAT-server/lib/xcat/plugins/kvm.pm
+++ b/xCAT-server/lib/xcat/plugins/kvm.pm
@@ -2465,13 +2465,7 @@ sub process_request {
       $command = 'rmigrate';
   }
 
-  my $sitetab = xCAT::Table->new('site');
-  if ($sitetab) {
-      my $xhent = $sitetab->getAttribs({key=>'usexhrm'},['value']);
-      if ($xhent and $xhent->{value} and $xhent->{value} !~ /no/i and $xhent->{value} !~ /disable/i) {
-          $use_xhrm=1;
-      }
-  }
+  if ($::XCATSITEVALS{usexhrm}) { $use_xhrm=1; }
   $vmtab = xCAT::Table->new("vm");
   $confdata={};
   xCAT::VMCommon::grab_table_data($noderange,$confdata,$callback);
@@ -2497,10 +2491,7 @@ sub process_request {
       $vmmaxp=1; #for now throttle concurrent migrations, requires more sophisticated heuristics to ensure sanity
   } else {
       my $tmp;
-      if ($sitetab) {
-        ($tmp)=$sitetab->getAttribs({'key'=>'vmmaxp'},'value');
-        if (defined($tmp)) { $vmmaxp=$tmp->{value}; }
-      }
+      if ($::XCATSITEVALS{vmmaxp}) { $vmmaxp=$::XCATSITEVALS{vmmaxp}; }
   }
 
   my $children = 0;
@@ -2570,12 +2561,7 @@ sub process_request {
   my @allerrornodes=();
   my $check=0;
   my $global_check=1;
-  if ($sitetab) {
-    (my $ref) = $sitetab->getAttribs({key => 'nodestatus'}, 'value');
-    if ($ref) {
-       if ($ref->{value} =~ /0|n|N/) { $global_check=0; }
-    }
-  }
+  if ($::XCATSITEVALS{nodestatus} =~ /0|n|N/) { $global_check=0; }
 
 
   if ($command eq 'rpower') {
@@ -2625,10 +2611,7 @@ sub process_request {
     }
   }
 
-  my $sent = $sitetab->getAttribs({key=>'masterimgdir'},'value');
-  if ($sent) {
-    $xCAT_plugin::kvm::masterdir=$sent->{value};
-  }
+  if ($::XCATSITEVALS{masterimgdir}) { $xCAT_plugin::kvm::masterdir=$::XCATSITEVALS{masterimgdir} }