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I often deal with filesystem snapshots, usually LVM or ZFS. I have also had experience with linked clones and the like on the VMWare level.
Is it possible to take a snapshot of a single file? the scenario is such: my company has a shared network drive that is 2TB. on that 2TB, there is a 100GB file that I need to make a quick copy of. If I take a filesystem snapshot of it, the amount of changes happening on the rest of the network drive will quickly invalidate the snapshot's smaller size. Can I take a snapshot of a single file, for quick and dirty use, without affecting the source file?
The problem is that once the file is open, taking a snapshot may not catch the file from before it was open...
To do that would require a log structured filesystem. With a log structured filesystem the new file may be written, but it will be copied for the changes - or the changes will be in new blocks, with the original file remaining intact.