diff --git a/xCAT-server/lib/xcat/plugins/copycds.pm b/xCAT-server/lib/xcat/plugins/copycds.pm
index 5beabb975..b1de9e830 100644
--- a/xCAT-server/lib/xcat/plugins/copycds.pm
+++ b/xCAT-server/lib/xcat/plugins/copycds.pm
@@ -140,7 +140,7 @@ sub process_request {
 
     chdir($existdir);
     while (wait() > 0) { yield(); } #Make sure all children exit before trying umount
-    system("umount /mnt/xcat");
+    system("umount -l /mnt/xcat");
     unless ($identified) {
        $callback->({error=>["copycds could not identify the ISO supplied, you may wish to try -n <osver>"],errorcode=>[1]});
     }
diff --git a/xCAT-server/lib/xcat/plugins/esx.pm b/xCAT-server/lib/xcat/plugins/esx.pm
index cad5f76c7..2c7180705 100644
--- a/xCAT-server/lib/xcat/plugins/esx.pm
+++ b/xCAT-server/lib/xcat/plugins/esx.pm
@@ -4210,7 +4210,7 @@ sub copycd {
         }
         if ($::CDMOUNTPATH) {
             chdir("/");
-            system("umount $::CDMOUNTPATH");
+            system("umount -l $::CDMOUNTPATH");
         }
     };
     my $KID;
@@ -4763,11 +4763,11 @@ sub cpNetbootImages {
             
             if(system("cp /mnt/xcat/* $destDir/")){
                 xCAT::SvrUtils::sendmsg([1,"Could not copy netboot contents to $destDir"], $output_handler);
-                system("umount /mnt/xcat");
+                system("umount -l /mnt/xcat");
                 return;
             }
             chdir("/tmp");
-            system("umount /mnt/xcat");
+            system("umount -l /mnt/xcat");
             print "tempDir: $tmpDir\n";
             system("rm -rf $tmpDir");
             } elsif (-r "$srcDir/cim.vgz" and -r "$srcDir/vmkernel.gz" and -r "$srcDir/vmkboot.gz" and -r "$srcDir/sys.vgz") {