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Hello all, I have a doubt that i think you hackers of rsync has the answer. ;-) I have make this post on my blog: http://www.posix.brte.com.br/blog/?p=312 to start a serie about the copy-on-write semantics of ZFS. In my test "VI" did rewrite the whole file just for change 3 bytes, so the whole file was reallocated. What i want to know from you is about the techniques used by rsync