Hallöchen! 1. I have a subvolume "VirtualBox" with an OS image (50 GiB VDI file).
2. I create a read-only snapshot with "btrfs su sn -r VirtualBox parent". 3. I work with the OS, changing some data within the VDI file. 4. "btrfs p s VirtualBox ro true" 5. "btrfs send -p parent VirtualBox | wc -c" yields 60 MiB. 6. "btrfs su c temp" 7. "cp -a --reflink VirtualBox/* temp" (takes less than 1 sec) 8. "btrfs send -p parent temp | wc -c" yields 12 GiB. Why does "cp --reflink" break so much that the size of "btrfs send" jumps from almost nothing to one quarter of the whole subvolume size? Regards, Torsten. -- Torsten Bronger
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