Number of replicated systems?

[Dan Lowe <dan@tangledhelix.com>]

Netscape/iPlanet have always told us that when we got to about 7 or 8 
replicated hosts we would be at the system's limit, and would need to 
introduce a "hub" system.  That's just a system that gets updates from 
the master, and then in turn sends out updates to its own cluster of 
slave systems (so it's a cascading replicator, both master and slave).

In any case, I never found out if they were right since I've never gone 
over 6 slave hosts.  Is there some data out there on how many 
replicated hosts one can have off a single master?  I'd like to 
rearchitect our LDAP service entirely and end up with something like a 
dozen hosts replicated off a single master.  Is this feasible?

Unfortunately I don't have enough non-production hardware to do the 
testing myself and find out the right way.

Thanks,
 -dan