Data at Rest Encryption, also known as D@RE, is fully supported on systems utilizing Dell Unity Data Reduction. Data reduction is not impacted by Data at Rest Encryption, as all data reduction operations occur on data residing in System Cache. For data being written to disk, the data is first passed through the data reduction algorithms within System Cache, then written through hardware-based encryption modules to the backend drives. For reads from disk, the data is first decrypted and saved into System Cache before the data reduction algorithm recreates the original data and sends it to the host.
More information about Data at Rest Encryption can be found in the Dell Unity: Data at Rest Encryption white paper found on Dell Technologies Info Hub.
