Overprovisioning resources brings some risks and downsides that should be understood:

  • Potential for high CPU Ready times. As more vCPUs are added to hosts that might already have high workloads, CPU ready time can increase, thus forcing the VM to wait for resource availability.
  • Wasted RAM and additional cost. With the introduction of VMware’s vRAM entitlements, which came with vSphere 5, overprovisioning RAM to a virtual machine can now carry a real and direct cost as the RAM assigned to a virtual machine is now licensed

Troubleshooter suggest to assign the right resources to VM, based on a computation of resources consumption in the last week.

Posted in: VMware vSphere