Key Concepts in Capacity Analytics > Optimization Resource Allocation Rating

Optimal Resource Allocation Rating

The Optimal Resource Allocation rating on the Executive Summary and Detailed View provides a quick indication of the state of the current VM placement and sizing. The Optimal Resource Allocation rating is calculated taking into consideration the current VM host and storage topology. However, the constraints on the VM hosts and storage components are not taken into consideration. Based on the rating you can choose to create optimization scenarios with constraints to arrive at detailed optimization analysis results. The Optimal Resource Allocation Rating shows:

This is different from the detailed and full optimization analysis feature provided by SHO. For information on full optimization analysis, see Optimal VM Placement and Optimal VM Sizing.

The Optimal Resource Allocation Rating method works in two steps:

  1. It calculates the minimum number of VM hosts required to place all the VMs for the selected group.
  2. It then calculates the average utilization percentage before and after optimization.

    Utilization percentage before optimization = (Used capacity before optimization / Total available capacity before optimization) * 100
    Utilization percentage after optimization = (Used capacity after optimization / Total available capacity after optimization) * 100

The Utilization percentage before and after optimization are placed in one of the following ranges:

Range 1 = 0 percent to 9 percent
Range 2 = 10 percent to 29 percent
Range 3 = 30 percent to 49 percent
Range 4 = 50 percent to 69 percent
Range 5 = 70 percent to 100 percent

The star rating calculation is done as follows:

Number of stars = (Range for Utilization percentage after optimization) minus (Range for Utilization percentage before optimization)

Consider the following example:

If the Utilization percentage before optimization = 40 percent (that is, it is in Range 3) and the Utilization percentage after optimization = 95 percent (that is, it is in Range 5)

The Optimal Resource Allocation Rating in number of highlighted stars = Range 5 minus Range 3 = 2 stars


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