The Encryption License Key feature provides data-at-rest encryption. Encryption is enabled at the parity-group level to protect the data stored on the drives in the parity group.
CAUTION:
Data encryption is not ensured in a pool with mixed encryption (that is, the pool contains both encrypted and nonencrypted pool-VOLs). To manage data encryption securely, make sure that all pool-VOLs in a pool are encrypted.