[PLUG] Rsyncd And Performance
Russell Senior
seniorr at aracnet.com
Tue Feb 13 23:45:25 UTC 2007
>>>>> "Jason" == Jason Van Cleve <jvancleve at chrome.com> writes:
Jason> Hail! We're doing a large rsync operation and need to use the
Jason> checksum mode, because files' dates are often changing, but not
Jason> their contents. I believe we're just using the rsh-type
Jason> interface, and it's taking longtemps. Can anyone tell me
Jason> whether running rsync in deamon mode on one end would speed
Jason> things up at all?
Jason> My theory is that the rsh-mode operation needs to read each
Jason> file from the remote machine in order to compare it locally.
Jason> If rsyncd could checksum the files remotely in parallel with
Jason> the local rsync command, then it should mean a lot less network
Jason> I/O.
Jason> But enquiring minds want to know: is that how rsyncd actually
Jason> works?
IIRC...
Adding the checksum is not going to speed anything up. It causes
rsync to bypass what would otherwise be a shortcut, i.e., rsync takes
the "longcut".
http://rsync.samba.org/
http://en.wikipedia.org/wiki/Rsync
--
Russell Senior ``I have nine fingers; you have ten.''
seniorr at aracnet.com
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