The many meanings of "remove"
In cryptsetup and dmsetup, the "remove" command is the way to unmount
a device. It's a harmless operation, like umount.
However, in lvm (which in turn uses dmsetup, I will note), "remove"
is how you permanently blow away a volume and overwrite its label. To
make something "inactive", which seems to be the semantically
equivalent operation, you use "vgchange -a n".
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