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Thanks FDenneman01, that all makes sense, I have a background in AIX/Solaris fair share scheduling so understand most of what you're saying. Scheduling is all about fairness, not making sure it will work - if its oversubscribed it will still break whatever. As you say, the art is in understanding/predicting contention scenario behavior and its effect/relation to all workloads.
If I understand correctly then, the actual 'worst case' values are calculated on clusterwide capacity, but the actual running values will depend on the relative values of competing workloads within a DRS group of compute. All we are really doing within a resource pool is weighting the siblings within the scheduler (which is why hierarchy is very important).
I may well get this cluster deep dive book if it covers all this content.