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Why do some of my VMs have red circles around them?
When a configured threshold for a metric is breached by the value of the chosen statistical measure used in the sunburst, a red circle will be drawn around the VM. Typically this happens in scenario modelling when expected demand on a VM resources are larger than the configured capacity. When this is shown on the baseline, it is usually the result of mixed hardware in a cluster.
Mixed cluster hardware can cause problems in virtual environments. Technologies such as DRS will optimise a cluster capacity and reduce contention by moving VMs around within a cluster to ensure resources are available. However, this does not take into consideration the various platforms within a cluster. A machine with 2 CPU on a 2.6GHz machine has significantly less capacity if it is moved to a 1.8GHz machine. As such, in Capacity Planner you will see the time series for capacity change over time. See the below image.
In this case, we are using the CPU 95th percentile as our chosen statistical measure for this machine. The last known capacity for this machine is about 3.7GHz. You can see from the timeseries here that the capacity has changed as a result of movement between hardware types. The historical 95th percentile is actually higher than the current configured capacity. As a result, this will have black full bar for the CPU measure in the headroom dialog and will have a red circle around it on the sunburst. These machines also appear on the watch list.