diff --git a/src/cli/one_helper.rb b/src/cli/one_helper.rb
index 16f08400f3..50cc513fc1 100644
--- a/src/cli/one_helper.rb
+++ b/src/cli/one_helper.rb
@@ -399,6 +399,18 @@ EOT
         end
     end
 
+    # If the cluster name is empty, returns a '-' char.
+    #
+    # @param str [String || Hash] Cluster name, or empty Hash (when <CLUSTER/>)
+    # @return [String] the same Cluster name, or '-' if it is empty
+    def OpenNebulaHelper.cluster_str(str)
+        if str != nil && !str.empty?
+            str
+        else
+            "-"
+        end
+    end
+
     def OpenNebulaHelper.update_template(id, resource)
         require 'tempfile'
 
diff --git a/src/cli/one_helper/onedatastore_helper.rb b/src/cli/one_helper/onedatastore_helper.rb
index b94ad60a3f..5e4c4eecfb 100644
--- a/src/cli/one_helper/onedatastore_helper.rb
+++ b/src/cli/one_helper/onedatastore_helper.rb
@@ -57,11 +57,7 @@ class OneDatastoreHelper < OpenNebulaHelper::OneHelper
             end
 
             column :CLUSTER, "Name of the Cluster", :left, :size=>8 do |d|
-                if d["CLUSTER"] == "none"
-                    "-"
-                else
-                    d["CLUSTER"]
-                end
+                OpenNebulaHelper.cluster_str(d["CLUSTER"])
             end
 
             column :IMAGES, "Number of Images", :left, :size=>6 do |d|
@@ -111,8 +107,7 @@ class OneDatastoreHelper < OpenNebulaHelper::OneHelper
         puts str % ["NAME",     datastore.name]
         puts str % ["USER",     datastore['UNAME']]
         puts str % ["GROUP",    datastore['GNAME']]
-        puts str % ["CLUSTER",  datastore['CLUSTER']]
-        puts str % ["CLUSTER_ID",  datastore['CLUSTER_ID']]
+        puts str % ["CLUSTER",  OpenNebulaHelper.cluster_str(datastore['CLUSTER'])]
 
         puts str % ["DS_MAD",   datastore['DS_MAD']]
         puts str % ["TM_MAD",   datastore['TM_MAD']]
diff --git a/src/cli/one_helper/onehost_helper.rb b/src/cli/one_helper/onehost_helper.rb
index 63434231ba..1abdb32b4f 100644
--- a/src/cli/one_helper/onehost_helper.rb
+++ b/src/cli/one_helper/onehost_helper.rb
@@ -44,11 +44,7 @@ class OneHostHelper < OpenNebulaHelper::OneHelper
             end
 
             column :CLUSTER, "Name of the Cluster", :left, :size=>8 do |d|
-                if d["CLUSTER"] == "none"
-                    "-"
-                else
-                    d["CLUSTER"]
-                end
+                OpenNebulaHelper.cluster_str(d["CLUSTER"])
             end
 
             column :RVM, "Number of Virtual Machines running", :size=>6 do |d|
@@ -126,7 +122,7 @@ class OneHostHelper < OpenNebulaHelper::OneHelper
 
         puts str % ["ID", host.id.to_s]
         puts str % ["NAME", host.name]
-        puts str % ["CLUSTER", host['CLUSTER']]
+        puts str % ["CLUSTER", OpenNebulaHelper.cluster_str(host['CLUSTER'])]
         puts str % ["STATE", host.state_str]
         puts str % ["IM_MAD", host['IM_MAD']]
         puts str % ["VM_MAD", host['VM_MAD']]
diff --git a/src/cli/one_helper/onevnet_helper.rb b/src/cli/one_helper/onevnet_helper.rb
index 8281f51eff..39907836b1 100644
--- a/src/cli/one_helper/onevnet_helper.rb
+++ b/src/cli/one_helper/onevnet_helper.rb
@@ -55,11 +55,7 @@ class OneVNetHelper < OpenNebulaHelper::OneHelper
             end
 
             column :CLUSTER, "Name of the Cluster", :left, :size=>8 do |d|
-                if d["CLUSTER"] == "none"
-                    "-"
-                else
-                    d["CLUSTER"]
-                end
+                OpenNebulaHelper.cluster_str(d["CLUSTER"])
             end 
 
             column :TYPE, "Type of Virtual Network", :size=>6 do |d|
@@ -111,7 +107,7 @@ class OneVNetHelper < OpenNebulaHelper::OneHelper
         puts str % ["NAME", vn['NAME']]
         puts str % ["USER", vn['UNAME']]
         puts str % ["GROUP", vn['GNAME']]
-        puts str % ["CLUSTER", vn['CLUSTER']]
+        puts str % ["CLUSTER", OpenNebulaHelper.cluster_str(vn['CLUSTER'])]
         puts str % ["TYPE", vn.type_str]
         puts str % ["BRIDGE", vn["BRIDGE"]]
         puts str % ["VLAN", OpenNebulaHelper.boolean_to_str(vn['VLAN'])]
diff --git a/src/cluster/ClusterPool.cc b/src/cluster/ClusterPool.cc
index c96d660ca1..32d549b1dc 100644
--- a/src/cluster/ClusterPool.cc
+++ b/src/cluster/ClusterPool.cc
@@ -26,7 +26,7 @@
 /* Regular ones start from ID 100                                             */
 /* -------------------------------------------------------------------------- */
 
-const string ClusterPool::NONE_CLUSTER_NAME = "none";
+const string ClusterPool::NONE_CLUSTER_NAME = "";
 const int    ClusterPool::NONE_CLUSTER_ID   = -1;
 
 /* -------------------------------------------------------------------------- */
diff --git a/src/onedb/3.3.0_to_3.3.80.rb b/src/onedb/3.3.0_to_3.3.80.rb
index da472d349f..3fd8ee4631 100644
--- a/src/onedb/3.3.0_to_3.3.80.rb
+++ b/src/onedb/3.3.0_to_3.3.80.rb
@@ -126,7 +126,7 @@ module Migrator
         "  <TM_MAD>shared</TM_MAD>" <<
         "  <BASE_PATH>#{var_location}/datastores/0</BASE_PATH>" <<
         "  <CLUSTER_ID>-1</CLUSTER_ID>" <<
-        "  <CLUSTER>none</CLUSTER>" <<
+        "  <CLUSTER/>" <<
         "  <IMAGES/>" <<
         "  <TEMPLATE>" <<
         "    <DS_MAD><![CDATA[-]]></DS_MAD>" <<
@@ -169,7 +169,7 @@ module Migrator
 
             # Add Cluster elements
             doc.root.add_element("CLUSTER_ID").text = "-1"
-            doc.root.add_element("CLUSTER").text    = "none"
+            doc.root.add_element("CLUSTER").text    = ""
 
             @db[:host_pool].insert(
                 :oid            => row[:oid],
@@ -198,7 +198,7 @@ module Migrator
 
             # Add Cluster elements
             doc.root.add_element("CLUSTER_ID").text = "-1"
-            doc.root.add_element("CLUSTER").text    = "none"
+            doc.root.add_element("CLUSTER").text    = ""
 
             @db[:network_pool].insert(
                 :oid        => row[:oid],
@@ -283,7 +283,7 @@ module Migrator
         "  <TM_MAD>shared</TM_MAD>" <<
         "  <BASE_PATH>#{var_location}/datastores/1</BASE_PATH>" <<
         "  <CLUSTER_ID>-1</CLUSTER_ID>" <<
-        "  <CLUSTER>none</CLUSTER>" <<
+        "  <CLUSTER/>" <<
         images_element <<
         "  <TEMPLATE>" <<
         "    <DS_MAD><![CDATA[fs]]></DS_MAD>" <<