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Re: Backup Question -- Difference between rsync and hotcopy

From: Les Mikesell <lesmikesell_at_gmail.com>
Date: 2007-05-17 20:56:27 CEST

Johnathan Gifford wrote:
> I cannot speak how rsync handles copying. Hopefully someone else will
> respond to that side of the question.

Rsync examines the directory on both sides, skipping files where the
names, length, and timestamps match (unless you tell it to
ignore-times), then for files that have differences the sides exchange
block-checksums to identify the changed portions. Temporary filenames
are used during the transfer with a rename when a file is complete.
I don't think there is any control over the order of transmission so if
files are changing during the copy you might get random new and old
parts. However, the directory comparison runs quickly unless there is a
huge number of files - you might be able to repeat the rsync command
until no files are updated, which would mean that the copies are
completely in sync at that point in time.

   Les Mikesell
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Received on Thu May 17 20:56:32 2007

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