On 5/22/07, Paul Slootman <[EMAIL PROTECTED]> wrote:
On Sat 19 May 2007, Jacob Balazer wrote:
> I am using rsync 2.6.9 in daemon mode under Cygwin, and having trouble
> reconciling its --append behavior with that described in the man page:
>
> The man page says that when you use --append, it will update a file by
> appending, which presumes the existing data on the receiving side
> matches. But when I run rsync with append mode when the existing file
> on the receiving side is shorter than on the sending side, the first
> thing it does is (I think) is to read either most of or all of the
> file on the remote sending end: on the local receiving end, it says
> "recv_generator()" for each of the files, "generating and sending sums
> for 1", and then "generate_files phase=1", and then no progress for
> several minutes. After that several minutes, apparently a
> block-by-block comparison of the existing data starts. This operation
Rsync will always do a checksum verification of updated files, even with
--append. The manpage also says: "If that [the existing data is
identical] is not true, the file will fail the checksum test, and the
resend will do a normal --inplace update to correct the mismatched
data.". Hence the file will still be completely read.
Right. But isn't the checksum test referred to there performed after
the append or update operation? Otherwise, what's the point of the
--append option, if the check is performed beforehand? A checksum
computation takes as long as a block-by-block comparison, for large
files.
Jacob
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