Lenovo ThinkServer RD240 MegaRAID SAS Software User Guide - Page 70

3.2 Purpose Security is a growing market concern and requirement. MegaRAID customers are looking for a comprehensive storage encryption solution to protect data. You can use the FDE feature to help protect your data. 3.3 Terminology Table 3.1 describes the terminology related to the FDE feature. Table 3.1 Terminology used in FDE Option Description Authenticated Mode The RAID configuration is keyed to a user passphrase. The passphrase must be provided on system boot to authenticate the user and facilitate unlocking the configuration for user access to the encrypted data. Blob Key backup Passphrase Re-provisioning A blob is created by encrypting a key(s) using another key. There are two types of blob in the system - encryption key blob and security key blob. You need to provide the controller with a lock key if the controller is replaced or if you choose to migrate secure virtual disks. To do this, you must back up the security key. An optional authenticated mode is supported in which you must provide a passphrase on each boot to make sure the system boots only if the user is authenticated. Firmware uses the user passphrase to encrypt the security key in the security key blob stored on the controller. Re-provisioning disables the security system of a device. For a controller, it involves destroying the security key. For Full Disk (FDE) drives, when the drive lock key is deleted, the drive is unlocked and any user data on the drive is securely deleted. This does not apply to controller-encrypted drives, because deleting the virtual disk destroys the encryption keys and causes a secure erase. See Section 3.5, "Instant Secure Erase" for information about the instant secure erase feature. 3-2 Full Disk Encryption