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While discussing some tribal knowledge about how ironic is the black 
sheep of nova compute drivers I realized that we (nova) have no docs 
about the ironic driver like we do for other drivers, so we don't 
mention anything about the weird cardinality rules around compute 
service : node : instance and host vs nodename things, how to configure 
the service for HA mode, how to configure baremetal flavors with custom 
resource classes, how to partition for conductor groups, how to deal 
with scaling issues, missing features (migrate), etc. I've opened a bug 
in case someone wants to get started on some of that information:

https://bugs.launchpad.net/nova/+bug/1852446

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Thanks,

Matt