Re: internal vs. external snaphots

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

> Two completely different approaches to get a stable view of a file system:
Ah, thanks.
Is this just by accident or is there a technical reason for using one approach 
in one case and the other one in the other?

> - Internal (or -X) creates a copy of the file system
You mean, a copy of the fs metadata? Or does it really copy the fs?

> - External (or -x) just saves original data to the backup before it gets
> overwritten.  This snapshot is just a frozen image in time containing
> unreferenced but open files.
What's the reason for not performing the equivalent of an unmount in this case?