9. You can confirm that encryption is enabled and verify which key providers are in use by  selecting  Settings Security Encryption , as shown in Figure 12-56. Note the state  Online  for the key servers and the state  Validated  for the USB ports where USB flash  drives are inserted to make sure that they are properly configured. After the system is configured with a single encryption key provider, it is possible to add a  second provider.  Note:  If you set up encryption of your storage system when it was running a version of  IBM Spectrum Virtualize earlier than Version 7.8.0, then when you upgrade to Version 8.1  you must rekey the master encryption key before you can enable a second encryption  provider. 12.5 Configuring more providers Figure 12-56 Encryption that is enabled with both USB flash drives and key servers Chapter 12. Encryption  677