You can customize the MDisks by Pools view to show the array encryption status. Select  Pools  MDisk by Pools , and then select  Actions  Customize Columns  Encryption .  You can also right-click the table header to customize columns, and select  Encryption , as  shown in Figure 12-74.  You can also check the encryption state of an array by looking at its drives under  Pools Internal Storage  view. The internal drives that are associated with an encrypted array are  assigned an encrypted property, as shown in Figure 12-75. For instructions about how to add external storage to a pool, see Chapter 6, “Storage pools”  on page 213. Each MDisk that belongs to external storage and is added to an encrypted pool  or child pool is automatically encrypted by using the pool or child pool key, unless the MDisk  is detected or declared as self-encrypting. The user interface has no method to see which extents contain encrypted data and which do  not. However, if a volume is created in a correctly configured encrypted pool, then all data that  is written to this volume will be encrypted. 692  Implementing the IBM System Storage SAN Volume Controller with IBM Spectrum Virtualize V8.2.1 12.8.4 Encrypted MDisks Figure 12-74 Array encryption state Figure 12-75 Drive encryption state