text: **Note:**Assigning a tier that does not match to a physical back-end storage type to an 
  external MDisk is not supported by IBM and can lead to unpredictable consequences. 
  
  To determine what tier is assigned to an MDisk, on**Pools**→**External Storage**, select 
  **Actions**→**Customize columns**and select**Tier**. This includes the current tier setting into a 
  list of MDisk parameters that are shown on the**External Storage**pane. You can also find this 
  information in MDisk properties. To show this information, right-click**MDisk**, select 
  **Properties**, and click**View more details**, as shown in Figure 10-6. 