To all, I'd like to introduce an initcpio hooks I created called liveroot. It basically allows one to run Arch root on a ram block device. It has three modes: oroot=compressed (compressed block device), oroot=raw (tmpfs), oroot=live (run entirely on ram). In addition, it has a function called overlay_flush which lets one flush the ram block device to disk.
https://aur.archlinux.org/packages/liveroot/ Regards, Mark
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