A Unity 400 system has Data at Rest Encryption licensed and enabled. Which operation(s) must be performed
from the Unisphere Settings window to ensure the system is still operational after SP replacements?

A.
Download Audit Log

B.
Download Checksum

C.
Backup Keystore File

D.
Download Audit Log and Checksum

Explanation:
The keystore is tied to the storage processors, so care must be taken when performing service operations in
order to preserve the encryption keys. In the event that the chassis and both storage processors need to bereplaced, both storage processors should not be replaced at the same time. Instead, the chassis replacement
should be followed while retaining one SP until the array is back online before replacing the second SP. In the
case that storage processors have already been replaced at the same time and the keystore was lost, the
keystore may be restored from an external backup.
http://www.emc.com/collateral/white-papers/h15090-emc-unity-data-at-rest-encryption.pdf (page
10)