this post was submitted on 28 Mar 2024
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just comparing the subvolume with its snapshot with
btrfs send -p /example/subvol /snapshot/of/example/subvol >examplediff.btrfs
.From
man btrfs-send
Thanks for btdu, it seems useful as 'btrfs fi du' probably doesn't account for compression, will check it out sometime.
Note that the diff does not necessarily correlate with the amount of data that changed, not how much additional space the snapshot takes.
You are right. I shouldn't have used diff. I'll fix that
Also, incremental changes from subvolume to its snapshot might be incorrect as that will be new data added to subvolume, rather that old data deleted from subvolume while still present in snapshot. I'll have to check carefully.