Re: How to resume an scp transfer?
From: Darren Dunham (ddunham_at_redwood.taos.com)
Date: 04/29/04
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Date: Thu, 29 Apr 2004 18:08:00 GMT
Jack Moe <mojorisin@bigmailbox.net> wrote:
> Kyler Laird <Kyler@news.Lairds.org> wrote in message news:<hhh2m1-fbo.ln1@snout.lairds.org>...
>> mojorisin@bigmailbox.net (Jack Moe) writes:
>>
>> >That's interesting. Didn't think of that. 'rsync' supports delta
>> >transfers, too.
>>
>> Be careful with them. The original (partial) transfer is not just extended
>> when the transfer is resumed. A new file is created. Thus, if you are
>> moving a 10GB file and you get 9GB before stopping, then resume, you'll use
>> up to 19GB until the transfer is complete.
>>
>> (At least that's the way it worked awhile ago when I investigated.)
>>
>> --kyler
> What version did you test this with.
> Per rsync's web site at http://rsync.samba.org/features.html
> "rsync is a file transfer program for Unix systems. rsync uses the
> "rsync algorithm" which provides a very fast method for bringing
> remote files into sync. It does this by sending just the differences
> in the files across the link, without requiring that both sets of
> files are present at one of the ends of the link beforehand."
The two statements above are not incompatible. My understanding is that
while only the differences are sent, they do not modify the existing
file. To avoid problems of disconnects in the middle of a transfer,
rsync needs to complete the transfer to a separate file, then move the
file into place. If a problem occurs in the middle of a transfer, the
temp file can be safely deleted.
I'm not sure how it works, but that could easily be done by making a
(local) copy of the existing file, then running the rsync algorithm to
apply differences.
-- Darren Dunham ddunham@taos.com Senior Technical Consultant TAOS http://www.taos.com/ Got some Dr Pepper? San Francisco, CA bay area < This line left intentionally blank to confuse you. >
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