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Is it worth switching to BTRFS for the average user?
(aussie.zone)
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this post was submitted on 14 Aug 2023
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Do you happen to have a source or benchmark for this? My understanding of CoW is that the size of the file does not matter, as BTRFS works with blocks and not files. When a block is changed, it's written to a new location. All the old blocks that are not changed are not written again - this wouldn't even make sense in the context of how BTRFS deduplicates blocks anyway.
So:
10 kB base file
modify 1kB of the content
== 11kB total "used" space, and 1kB of new written blocks.
that old 1kB that is no longer part of the file will eventually be cleaned up if needed, but there's no reason to delete it early.