ahh --
so with "Use HA configuration" checked, if we were using Admission control, it would reserve 25% (CPU and Memory) on each host. Then the 25% that I put in the field, is an ADDITIONAL 25%.
So - the way things are (with no admission control configured) the "Use HA configuration" check-box does ... basically nothing, correct? So then - the 25% that I have set will essentially do what I was hoping it would do.
(I know, you don't think it offers the 'level of protection' that admission control does - but I don't need admission control - I just want to have a way of keeping track that the entire cluster is roughly N+1).
These "buffers" after all are not real - they are just calculation contrivances to let us know where we are with respect to capacity remaining, and using the "+1" as a floor is my only simple basic goal. Thanx for you help!