Comment 9 for bug 1388860

>> Still, the behavior from juju seemed to place new machines into the same AZ
>> every time a new machine was added. This meant no new machines were usable.
>
> Not sure what you mean here. Why does it mean no new machines were usable?

Oh, I think I understand now. Juju will attempt to provision into the AZs in order of least-to-most populated (per service). Since the error returned wasn't classified as one that should cause Juju to retry in the next AZ, it would just fail and then the next attempt would do exactly the same thing. Will be fixed by skipping over.