Chapter 12. Encryption 623
A minimum of one USB flash drive with the correct master access key is required to unlock 
access to encrypted data after a system restart such as a system-wide reboot or power loss. 
No USB flash drive is required during a warm reboot, such as a node exiting service mode or 
a single node reboot. The data center power-on procedure needs to ensure that USB flash 
drives containing encryption keys are plugged into the storage system before it is powered 
on.
During power-on, insert USB flash drives into the USB ports on two supported canisters to 
safeguard against failure of a node, node’s USB port, or USB flash drive during the power-on 
procedure.
To enable encryption by using USB flash drives as the only encryption key provider, complete 
the following steps:
1. In the Enable Encryption wizard Welcome tab, select USB flash drives and click Next, as 
shown in Figure 12-24.
Figure 12-24   Selecting USB flash drives in the Enable Encryption wizard