[plug] Constant rsync'ing...

Trevor Phillips T.Phillips at murdoch.edu.au
Mon Mar 17 15:29:14 WST 2003


On Monday 17 March 2003 15:15, James Devenish wrote:
>
> (Just to keep pushing the Unison barrow:) Unison, being userland
> software, is not attached to partitions: it works at the level of
> already-mounted filesystems. You can tell it to use any 'roots'
> ("base directories") and ignore/include any files/directories.

I'm all for userland solutions, especially ones that can work from a directory 
base instead of a partition level. As long as they do the job and do it 
efficiently. I will give Unison a go and compare it to rsync, at least.

> > I considered Unison, and keep meaning to try it out in this role. Would
> > it really be any faster than rsync's "building file list" phase, though?
>
> (I've not used rsync much. Never seemed to fit the bill for me, so I
> don't know how it performs.) Unison only 'builds' its file list once and
> then stores this 'last known good' state. Subsequent runs are fast.

The problem I have with the rsync/unison solution is that, even if unison has 
a file list already, to check for updates, it still has to scan every file, 
does it not? Otherwise, how does it know that a file is different from what 
is in its db of file statuses?

-- 
. Trevor Phillips             -           http://jurai.murdoch.edu.au/ . 
: Web Technical Administrator     -          T.Phillips at murdoch.edu.au : 
| IT Services                        -              Murdoch University | 
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