Master-master configuration. So you got bin logs on both instances ;-) Here is a link to it http://www.mysqlperformanceblog.com/2009/02/01/fast-mysql-master-master-failover-with-select-mirroring/ The advantage of this solution is that there always a mysql server running. Once one node goes down, if you have set up a notification program like nagios, you know that you need to reconfigure a master node, but your app is still running.
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