668 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
12.9.2  Rekeying using USB flash drives
During the rekey process, new keys are generated and copied to the USB flash drives. These 
keys are then used instead of the current keys. The rekey operation fails if at least one of the 
USB flash drives does not contain the current key. To rekey the system, you need at least 
three USB flash drives to store the master access key copies.
After the rekey operation is complete, update all other copies of the encryption key, including 
copies stored on other media. Take the same precautions to securely store all copies of the 
new encryption key as when you were enabling encryption for the first time.
To rekey the master access key on USB flash drives, complete the following steps:
1. Click Settings → Security → Encryption. Click USB Flash Drives to expand the 
section, as shown in Figure 12-86.
Figure 12-86   Locate USB Flash Drive section in the Encryption view