I have spent some time now trying to set up my notebook with a software raid 1 built from 2 SSDs and encrypted btrfs and so far failed miserably.
Sseems the installer doesn't support this combination at all.
What i tried:
All those attempts have been tried with and without a separate unencrypted /boot and /boot/efi. I only would need encrypted root and home, boot can be unencrpyted if needed.
1) Raid + Encrypted Btrfs When creating btrfs on a raid device, the encryption checkbox is disabled, while it's available for other filesystems.
2) Raid + Encrypted LVM While creating "normal" LVM Partitions has a encryption checkbox, the installer directly uses raid devices in the LVM creation interface, encryption option nowhere to be seen.
3) Raid + Manual cryptsetup I created a raid 1 and did a manual cryptsetup on it. The installer detects the encrypted raid and asks for a password. From there on the installer seems to work as expected. Can create a LVM on the encrypted raid (also the installer shows correcty that it's encrypted), i can create my needed filesystems and the installer completes without errors. Sadly the installed system fails to boot. At this point i've given up and haven't investigated further.
I would know how to do all necessary stuff manually i probably manage to make everything boot up, but i don't want to intervene with standard setup too much, as this probably will cause problems with future upgrades / updates.
Did i miss something or is it really impossible to combine raid + btrfs+ encryption at the current state of the installer?