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[blazar] Question about Interaction between Ironic and Blazar

Hi! I'm working with both Ironic and Blazar, and came across a strange
interaction that I was wondering if the Blazar devs were aware of.

I had four Ironic nodes registered, and only node A had an instance running
on it. I tried adding node B - which was available - to the freepool and
got this error:

2019-02-13 09:42:28.560 220255 ERROR oslo_messaging.rpc.server
ERROR: Servers [[{u'uuid': u'298e83a4-7d5e-4aae-b89a-9dc74b4278af',
u'name': u'instance-00000011'}]] found for host

This was strange, because the instance in question was running on node A,
and not node B.

After some investigation, the cause was identified as the following:

But in the meantime, my question is: have other people using Blazar and
Ironic run into this issue? It would seem to imply that Ironic nodes can
only be added to the freepool if no instances are created, which poses a
long-term maintenance issue. Is there a workaround?

Tzu-Mainn Chen
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