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Multisite Deployment - avoiding split brain / quorum


I am looking at expanding an OpenStack deployment into another site. Currently I have three controllers, and numerous computer nodes in a single site.

My question is, what is the best practise to expand this into another site. Obviously all steps to keep the two sites connected will be taken, but if I had another three controllers in the second site, should I lose connectivity, I would end up with a split brain.

So, what's the ideal solution to having a two (or even three) site deployment - in case the two or three sites lose connectivity to one another.