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Re: OpenLDAP Scaling

Brian Zuromski wrote:

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)...

The test showing ~35,000 auths/second on 100Mbit ethernet was done using a Celestica A8440 with 4 Opteron 875s. The test was network-limited, the CPUs were pretty idle. The machine had 16GB of RAM.

  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/