Mailinglist Archive: opensuse (3222 mails)

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Re: [SLE] backing up a partition
  • From: Michael.Salmon@xxxxxxxxxxxxxxx (Michael Salmon)
  • Date: Tue, 08 Feb 2000 16:44:29 +0100
  • Message-id: <38A039DD.ABD18D8B@xxxxxxxxxxxxxxx>



François Pinard wrote:
>
> tabanna <tabanna@xxxxxxxxxxx> écrit:
>
> > > Indeed. `rsync' is a wonderful tool, which should be known.
>
> > ~ do please expand :)
>
> `rsync' is especially useful when synchronising big hierarchies over a
> slow communication link, as it only transmit _differences_ between files.
> For me, this greatly speeds things up, often by a factor of thousands.
> Let me add one more little mind teaser. I leave you to guess how `rsync'
> succeeds in computing differences, without transferring the files :-).

There is a papper on the web server but basically it sends checksums of
blocks of the files and compare them, it can update parts of a file as well
so that if you change just 1 letter in a file you only have to transfer a
part of the file.

/Michael

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