diff --git a/src/sunstone/models/OpenNebulaJSON/VirtualMachineJSON.rb b/src/sunstone/models/OpenNebulaJSON/VirtualMachineJSON.rb
index 3cfcb23aee..472b736b39 100644
--- a/src/sunstone/models/OpenNebulaJSON/VirtualMachineJSON.rb
+++ b/src/sunstone/models/OpenNebulaJSON/VirtualMachineJSON.rb
@@ -76,6 +76,7 @@ module OpenNebulaJSON
                  when "unresched"    then self.unresched
                  when "recover"      then self.recover(action_hash['params'])
                  when "save_as_template" then self.save_as_template(action_hash['params'])
+                 when "disk_resize"  then self.disk_resize(action_hash['params'])
                  else
                      error_msg = "#{action_hash['perform']} action not " <<
                          " available for this resource"
@@ -112,6 +113,10 @@ module OpenNebulaJSON
                 params['type'], params['snapshot_id'].to_i)
         end
 
+        def disk_resize(params=Hash.new)
+            super(params['disk_id'].to_i, params['new_size'])
+        end
+
         def snapshot_create(params=Hash.new)
             super(params['snapshot_name'])
         end
diff --git a/src/sunstone/models/SunstoneServer.rb b/src/sunstone/models/SunstoneServer.rb
index 1d125e557d..c79d97c5f6 100644
--- a/src/sunstone/models/SunstoneServer.rb
+++ b/src/sunstone/models/SunstoneServer.rb
@@ -47,7 +47,7 @@ class SunstoneServer < CloudServer
             when "host"             then HostPoolJSON.new(client)
             when "image"            then ImagePoolJSON.new(client, user_flag)
             when "vmtemplate"       then TemplatePoolJSON.new(client, user_flag)
-            when "vm_group"          then VMGroupPoolJSON.new(client, user_flag)
+            when "vm_group"         then VMGroupPoolJSON.new(client, user_flag)
             when "vm"               then VirtualMachinePoolJSON.new(client, user_flag)
             when "vnet"             then VirtualNetworkPoolJSON.new(client, user_flag)
             when "user"             then UserPoolJSON.new(client)
diff --git a/src/sunstone/public/app/tabs/vms-tab/dialogs/disk-resize.js b/src/sunstone/public/app/tabs/vms-tab/dialogs/disk-resize.js
index f2a06529ff..816a3b9d59 100644
--- a/src/sunstone/public/app/tabs/vms-tab/dialogs/disk-resize.js
+++ b/src/sunstone/public/app/tabs/vms-tab/dialogs/disk-resize.js
@@ -92,21 +92,32 @@ define(function(require) {
     $( ".uinput-slider", context).on("input", function(){
       $( ".uinput-slider-val",context).val(Humanize.size($( ".uinput-slider",context).val()));
       var cost = Humanize.sizeToMB($( ".uinput-slider",context).val())*that.diskCost;
+      if(isNaN(cost)){
+        cost = 0;
+      }
       document.getElementById("new_cost_resize").textContent =  Locale.tr("Cost")+": "+ convertCostNumber(cost);
     });
 
     $( ".uinput-slider-val", context).on("change", function(){
       $( ".uinput-slider",context).val(Humanize.sizeToMB($( ".uinput-slider-val",context).val()));
       var cost = Humanize.sizeToMB($( ".uinput-slider",context).val())*that.diskCost;
+      if(isNaN(cost)){
+        cost = 0;
+      }
       document.getElementById("new_cost_resize").textContent =  Locale.tr("Cost")+": "+ convertCostNumber(cost);
     });
 
     var cost = Humanize.sizeToMB($( ".uinput-slider",context).val())*this.diskCost;
+    if(isNaN(cost)){
+        cost = 0;
+    }
     document.getElementById("new_cost_resize").textContent =  Locale.tr("Cost")+": "+ convertCostNumber(cost);
 
 
     $('#' + DIALOG_ID + 'Form', context).submit(function() {
       var new_size = $( ".uinput-slider",context).val();
+      new_size = Math.round(parseInt(new_size) / 1024);
+      new_size = new_size.toString();
       var obj = {
         "vm_id": that.element.ID,
         "disk_id" : that.diskId,