How to create an encrypted RAID CoreStorage volume in macOS Sierra
From blinkenwiki
(Or skip step 6 for a non-encrypted volume.)
1. Get the device names (identifiers) for the disks to use:
# diskutil list
2. Create an AppleRaid device
# diskutil ar create stripe PlutoRAID jhfs+ disk97 disk98
- (In Catalina, at this step, the mac will pop up a dialog asking if you want to use the new volume as a backup volume. Decline.)
3. Create a CoreStorage logical volume group
# diskutil cs create PlutoLVG PlutoRAID
4. Create a CoreStorage volume
# diskutil cs createvolume PlutoLVG jhfs+ Pluto 100%
- (In Catalina, at this step, the mac will pop up a dialog asking if you want to use the new volume as a backup volume. You can choose yes, and select “Encrypt backup”)
- (If you’re going to use the volume for Time Machine backups, go into the Preferences and add the volume as a backup now. Do not choose the “encrypt backup” option.)
6. (Optional) Encrypt the volume
# diskutil cs encryptvolume Pluto -passphrase ‘somepassphrasehere’
