[arch-general] crypttab support for non-root devices with systemd

Hi, I've installed Arch on a system with a two "disk" setup, where the first disk is a SSD, which I'm booting from. The second disk is an encrypted software RAID with LVM on top. Now obviously I want the second "disk" to be unlocked and mounted automatically on boot. This was no problem in the past. Now with systemd it seems to be harder. At least I get asked for the password on boot. This will unlock the device, however afterwards I have to activate the LVM and mount it manually. Is this already supported out of the box? The wiki mentions something about scripts, which may be changed, but I would like to have something more solid than self made scripts, which may break with every update in the future. Best regards, Karol Babioch