> I think I'm missing a part of this, the "a snapshot is created" sounds a
> lot like "here a miracle occurs." Where is this snapshot saved? And how
> do you take it in one sec regardless of f/s size?
LVM. Systems like LVM already provide a logical->physical block
mapping on disk, so they might as well provide multiple mappings.
If the live filesystem writes to a particular disk block, the
snapshot will keep referencing the old blocks while the filesystem
gets to work on its own data. Copy on Write snapshots for block
devices...
regards,
Rik
-- Bravely reimplemented by the knights who say "NIH".http://www.surriel.com/ http://distro.conectiva.com/
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