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What does an LVM Snapshot consist of ?

RE: Chapter 23.

I have read several articles about LVM snapshots, but still can't quite understand how they work.

Some sources suggest that the snapshot is an exact, point-in-time copy of a logical volume, however there are also references to the fact that the initial snapshot requires less space than the original volume. How can both be true ? What is missing from the snapshot that makes it smaller ?

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