said Mike Bird via tde-users:
| LVM uses hard drive partitions. They can be of any size. An LVM | partition can contain many filesystems. A single filesystem or even a | single file can be bigger than a single LVM partition. (I am | deliberately deferring LVM terminology until the last paragraph below.) | But you can't normally share a single partition between both LVM and | regular storage.
[much deleted]
Thanks very much for the description. What I still don't know is what it would do that I would want done. Which suggests to me that I probably don't need it.