Hi, All There is bug when running nova with ironic https://bugs.launchpad.net/nova/+bug/1402658
The case is simple: one baremetal node with 1024MB ram, then boot two instances with 512MB ram flavor. Those two instances will be scheduling to same baremetal node. The problem is at scheduler side the IronicHostManager will consume all the resources for that node whatever how much resource the instance used. But at compute node side, the ResourceTracker won't consume resources like that, just consume like normal virtual instance. And ResourceTracker will update the resource usage once the instance resource claimed, then scheduler will know there are some free resource on that node, then will try to schedule other new instance to that node. I take look at that, there is NumInstanceFilter, it will limit how many instance can schedule to one host. So can we just use this filter to finish the goal? The max instance is configured by option 'max_instances_per_host', we can make the virt driver to report how many instances it supported. The ironic driver can just report max_instances_per_host=1. And libvirt driver can report max_instance_per_host=-1, that means no limit. And then we can just remove the IronicHostManager, then make the scheduler side is more simpler. Does make sense? or there are more trap? Thanks in advance for any feedback and suggestion. Thanks Alex
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