asterisk users - Oct 2014 - Asterisk and Kamailio Load Balancing

I have a question please...i want to use Kamailio to do load balancing
between multiple asterisk servers - say two servers - .
I suppose that the configuration of the SIP users should be identical on
the two servers but i do not know what is the best way to achieve this
whether it will be by configuring Mysql replication between the two servers
or by configuring one of the server's database as a shared database ?!
Please can u explain that point ?
Best Regards
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