SCVMM 2012 SP1 - Performance counters

Hi,

I have a few questions/problems about the performance metrics displayed in the SCVMM 2012 SP1 Console.

Our environment in a nutshell:
We have an Hyper-V 2008R2 cluster made up of 9 hosts, running 90 VMs

The questions/problems:

• When I view the cluster performance counters, the used memory shows 38GB, while we currently using about 350GB.
  Is this counter showing me something else but the memory usage?
  
  
• There seems to be a problem with the storage graph as well as the scale and the total usage shows 0's
  
  
• Does anyone know where those performance values are stored in the VMM database?

Thank you,
Stephane