Hello,
I've just posted on wiki the very first draft of manual describing how to set up an encrypted OMV installation with aes-xts-plain64 cipher, random key for swap and exposing the rest of boot disk to store data.
http://wiki.openmediavault.org…f_boot_disk_to_store_data
I'll update it with screenshots soon. I hope you'll find it useful and maybe help to improve it.
This thread is meant for feedback, discussion and ideas related to that manual.