There were a few different discussions about Ironic using placement in various ways. On line 117 (for now) of the placement PTG etherpad [1] there are some notes about things that Ironic and Blazar could do for reservations. These are not expected to require any changes in placement. Dmitry and Tetsuro may have more to say about this. There was also a separate discussion about the options for using Placement do granular/detailed expression of available resources but full/chunky consumption of resources in a context where Ironic is running without Nova. That is: * record inventory for baremental nodes that say the inventory of node1 is CPU:24,DISK_GB:1048576,MEMORY_MB=1073741824 (and whatever else). * query something smaller (eg CPU:8,DISK_GB:524288,MEMORY_MB:536870912) in a GET /allocation_candidates * include node1 in the results along with others, let the client side sort using provider summaries * send back some mode of allocation that consumes the entire inventory of node1 There were a few different ideas on how to do that last step. One idea would have required different resource providers have an attribute that caused a change in behavior when allocated to. This was dismissed as "too much business logic in the guts". Another option was a flag on PUT /allocations that says "consume everything, despite what I've said". However, the option that was most favored was a new endpoint (name to be determined later if we ever do this) that is for the purpose of "fullly consuming the named resource provider". Clearly this is something that fairly contrary to how Nova imagines baremetal instances, but makes pretty good sense outside of the context where people want to be able to use placement to simultaneously get a flexible view of their baremetal resources and also track them accurately. There are no immediate plans to do this, but there are plans for Dmitry to continue investigating the options and seeing what can or cannot work. Having the feature described above would make things cleaner. I have made a placeholder (and low priority) story [2] that will link back to this email. [1] https://etherpad.openstack.org/p/placement-ptg-train [2] https://storyboard.openstack.org/#!/story/2005575 -- Chris Dent ٩◔̯◔۶ https://anticdent.org/ freenode: cdent tw: @anticdent