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As I understand Flocker creates ZFS snapshots which are replicated between the nodes. Is this happening continuously and to all nodes? It's not really clear from the post.

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Flocker doesn't continuously replicate data at this point, but it is something we've considered adding. Today, replication happens only when you migrate the data volume. This blog gives a good step-by-step of what happens when a migration occurs: https://clusterhq.com/blog/deploying-multi-node-elasticsearc...

Hey geku! We are not currently doing continuous replication between nodes, although we are working on a cloud block device backend which would allow synchronous replication using the underlying cloud block service.

In particular this would enable stateful failover... is that what you had in mind?

Yes, that was the point. Thanks for clarification.

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