I really love the snapshot logical volume feature, and I use it for
making consistent backups of my system while it is running.
Recently, though I found myself wanting to use a snapshot logical volume
to preserve the state of a filesystem while I experimented with
changes. When I needed to revert, I had to copy the contents from the
snashot logical volume, destroy the snapshot and snapshot source, and
then replace the snapshot source with the copy I made of the snapshot.
It seems like it would make sense for LVM to support a feature to revert
the source logical volume to the state it was in when the snapshot was
taken. I read through all the man pages but I didn't see anything like
this. I realize it might not be possible to do this atomically while
the source logical volume is active, but that's fine. I would still
like to be able to do it when the source is inactive.
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