rsync - May 2005 - Monitor a folder

Hi all.  Please forgive me if this question is of the "RTFM" variety. 
I am new to Rsync and just attempting to determine if it will meet my needs with
respect to one problem I am attempting to solve.

I have a web application which is running on Apache2/PHP which allows users to
upload files.  I would like to add a redundant server for load-balancing and
failover purposes but need to ensure that the "uploads" directory is
appropriately replicated to the second server.  Thus, my question is; can Rsync
monitor a folder or filesystem for changes and perform it's synchronization
when changes occur as opposed to being "cron'd" to run at
specified intervals?  If not, does anyone know of a decent way to handle such
things?  I am running on a Linux platform (RHEL4).

David A. Morrow
Technical Systems Lead
Autodata Solutions Company
David.Morrow@Autodata.Net
http://www.autodata.net
Tel: (519) 951-6079
Fax: (519) 451-6615 

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> Thus, my question is; can Rsync monitor a folder or filesystem for
> changes and perform it's synchronization when changes occur as opposed
> to being "cron'd" to run at specified intervals? 
No it can't.

But whenever I need to monitor a folder for changes I just write a simply low
priority script which looks for changes to the contents and then runs a Rsync on
it.

In Windows I simply do a DIR of the folder contents and save this to a file.
Then the script compares it again.

Easy to do this with a BASH script loop I would have thought?