vCloud Allocation Models, vCenter Resource Pools, and Per VM Resource Settings, Say What?

Allocation Pool Model

So now let’s look at the third option in detail known as the Allocation Pool model.  This is similar to the Reservation Pool whereas the settings are applied to the vCenter Resource Pool itself.  The difference is the users cannot control the vApp resources only the system administrator can alter those from vCloud Director.

Now again in vCenter here is what the Resource Pool shows which is very much the same as the Reservation Pool settings.  The main difference is we not only set the allocations, but we can set a percentage guarantee on this vDC so that not all the resources are pre-allocated.  Based on the percentages the actual amounts will vary on the reservations and limits.  We also note that like the Reservation Pool there is NO expandable reservation or anything unlimited.

This means only the system administrator can alter the settings of the vDC and all the Virtual Machines within it will in turn look similar to that of the Reservation Pool, but users cannot edit or control them as we see below.  What we also see is the per VM settings are a hybrid of the previous two models.  The CPU is wide open but the memory gets set to limits and reservations to preserve the memory settings.  This is where we see that this model is more of a hybrid of the other two where we set the resource pool and the virtual machine.  Frankly this appears to be possibly something incorrect as there is no vCD option to change or set the per VM resource information.  I am looking into this further because on the surface it just does not look right to me.

UPDATE: I did look further into the settings for a Virtual Machine under the Allocation Pool Model, and by design the percentage settings on the pool are ALSO passed down to the indivudual VM which is why the memory reservation is set.  However, it seems ONLY the memory is set as indicated below NOT the CPU reservation.  This explains why each virtual machine has settings specific to them inside the Allocation Pool Model.  However, in the UI the only mention of the settings is that they are applied to the Resource Pool, but as I said the percentages are also applied to each Virtual Machine.