Hyper-V 2012 VM Placement by SCVMM 2012 SP1

Hi,

I'd like to understand the logic behind VM placement in SCVMM 2012 SP1 and a 8 Node Hyper-v 2012 cluster. Each Node has 32GB RAM and each is a completely identical HP DL360.

Here is the current placement as performed by SCVMM

Node 1: 1 VM

Node 2: 2 VM's

Node 3: 6 VM's

Node 4: 1 VM

Node 5: 2 VM's

Node 6: 7 VM's

Node 7: 1 VM

Node 8: 1 VM

There are 2 x 16GB VM's, the rest of between 2GB and 8GB. Each of the overloaded hosts has a 16GB VM running on it.

I have a cluster reserve set to 1 Node failure. Why has it decided to favour Node 3 and 6? I appreciate the Maths to work out Node suitability are very complex but this seems rather odd.

Thanks in advance.

Eddie