It will probably never be an LVM stack, but I've also always believed that LVM and RAID are related but separate layers.
Having looked at the RAIDframe documentation you referenced, it strikes me that it cannot really move towards LVM and still be RAIDframe. It is a framework for doing rapid prototyping of RAID systems (and presumably their operation), and is available on a wide variety of platforms. To do anything else would be to change the fundamental nature of the beast.
It can certainly build upon whatever LVM layer appears in GEOM.
My experience has been that a good RAID/LVM system also needs a lot of support from the filesystem, and skimming through the RAIDframe documentation, it seems that I am not alone in this opinion. What work has been done (or identified) to make the filesystem more suitable for use with RAID/LVM systems? At the most basic, do we have things like "growfs" and "shrinkfs"?
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