Hi, I'm currently trying to reproduce . This bug requires to have the same host on two different aggregates, each one having an AZ.
IIRC, Nova API prevents hosts of being part of two distinct AZs , so IMHO this request should not be possible. That said, there are two flaws where I can identify that no validation is done : - when specifying an AZ in nova.conf, the host is overriding the existing AZ by its own - when adding an host to an aggregate without AZ defined, and afterwards update the aggregate to add an AZ So, I need direction. Either we consider it is not possible to share 2 AZs for the same host and then we need to fix the two above scenarios, or we say it's nice to have 2 AZs for the same host and then we both remove the validation check in the API and we fix the output issue reported in the original bug . Your comments are welcome. Thanks, -Sylvain  : https://bugs.launchpad.net/nova/+bug/1277230  : https://github.com/openstack/nova/blob/9d45e9cef624a4a972c24c47c7abd57a72d74432/nova/compute/api.py#L3378
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