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For those who've seen my presentation on MySQL HA, you already know that I often use a multimaster setup with a meta OCF resource that groups my favoured MySQL instance with the service ip, using a meta resource means that pacemaker monitors mysql, but it doesn't actually manage it.
It supports multimaster replication for redundancy and in the near future will support sharding for scalability.
One hard-to-solve problem in a multimaster replication is the conflict that can happen with self-generated keys.