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OpenLDAP Scaling

I'm trying to scale out a openldap server deployment to serve around 100K users.  I plan on having a master server and using syncrepl to create slaves that sit behind a load-balancer.  Is there a good rule of thumb to abide by when creating a scenario like this?  How many authentications/sec can a server typically handle?  I've seen the  benchmark comparisons (http://www.usenix.org/event/lisa07/htgr_files/chu.pdf) that have been posted by Howard, but it doesn't say what the system specs were that the tests were performed on?  I will have pretty beefy systems to use (lots of RAM and CPU)...