On Sat, 24 Sep 2016 15:26:14 +0300 Alexander Tomokhov <alexoundos@xxxxx> wrote: > does setting No_COW on a file (chattr +C) imply disabling data checksumming on it? Yes. IIRC the reasoning was that it's more difficult to track checksums of data which is being overwritten in-place (as opposed to CoW). > may it disable checksumming only for newly written extents and keep for reading existing ones? You can't apply chattr +C to any files of non-zero length, so by definition there won't be any pre-existing checksummed extents in that file. -- With respect, Roman
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