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Re: Replication & efficiency question

"Koszegi, Kelley" wrote:
> Hello,
> In the admin guide, chapter 10
> (http://www.openldap.org/doc/admin/replication.html) states that, "In
> certain configurations, a single slapd(8) instance may be insufficient to
> handle the number of clients requiring directory service via LDAP. It may
> become necessary to run more than one slapd instance."  Then it goes on to
> give a sample replication scenario in which a client first requests a modify
> operation of a slave, is referred to the master, requests a modify operation
> of the master and the master performs the operation.  The master also writes
> a change to a replication file.  The slurpd process then notifies the slave
> of the change.
> Here is my question: how is this process going to handle a larger number of
> clients?  It seems to me that each client is now forced to endure both a
> request to the slave & the (presumably overloaded?) master.  Can someone
> give me a clearer view of the picture?  I know I must be perceiving the
> example incorrectly.

This happens for modification only; reads (which are supposed to
writes in terms ov load, otherwise don't use Directory Services) are
within the slave, so many slaves allow load balancing (in a typical
for big organizations noone reads from the master, which is in charge of
replicating changes to a large number of slaves).


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