this post was submitted on 09 Mar 2025
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You can configure HA to use an external database, so you could (presumably) config two instances to use the same DB. Not sure how much conflict that would cause for entities that are only attached to one of those instances, but it seems like both should have the same access to state data and history. Could probably even set one instance up with read-only DB access to limit data conflicts, although I imagine HA will complain about that.
Even with an external database, HA still uses its internal DB for some things, so I don't think you'd ever get identically mirrored instances.