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Multi-Master Replication Manager for MySQL With Semi-Synchronous Replication

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http://serverfault.com – I'm attempting to set up Mysql nodes in active/passive HA setup with a virtual ip managed by HAproxy + Heartbeat/Corosync with MyISAM support (which excludes Galera/Percona) Does Multi-Master Replication Manager for MySQL (mmm) support semi-synchronous replication? If so, how to set it up correctly? (Such that only one master allows writes, with the other node(s) in read-only mode at the time) (HowTos)