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<div class="moz-cite-prefix">On 10/09/13 03:38, <a class="moz-txt-link-abbreviated" href="mailto:ameirh@gmail.com">ameirh@gmail.com</a>
wrote:<br>
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<div>It's great you brought up bbcp. I didn't factor this into
my initial email, but if we could further split up large files
into N chunks and transport them concurrently, that would
provide massive benefits as well. </div>
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<div>It's clear there are multiple areas for improvement that
would let us do away with having to use other tools for
various scenarios. If we could put some planning/development
time in even the easiest-to-implement cases, it would be
highly-beneficial to a large number of users.</div>
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Indeed. I actually hacked together a shell script wrapper around
rsync which would take the directory you were wanting to copy, tar
it up and then split the resultant large file into 'N' chunks - then
transfer the chunks in parallel. Using tricks with "post xfer" at
the other end, I would automagically unpack back to the original
directory structure. Major improvement in throughput - but only good
for "new" file transfers - not for replicating deltas/etc. And
before you ask, no you can't have it :-) It's part of a rather
complex file replication environment we have and isn't a module that
could easily be detached for redistribution<br>
<br>
To finish with, even though we can make rsync run much "faster" over
WANs, we don't use the feature I just mentioned! Just because you
can saturate your WAN pipe doesn't mean you should - typically
there's other traffic that also needs to co-exist and such a
hammering would have consequences - things have to be thought
through. It would be nice to have the ability, but that doesn't mean
everyone would use it all the time<br>
<pre class="moz-signature" cols="72">--
Cheers
Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +1 408 481 8171
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1
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