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Why do the Dedicated host costs in the chart and the drill-down view usually not match ?

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Consider you have a Dedicated Host, and it hosts two instances, A and B. Each instance contributes to the overall cost of the Dedicated Host. The Dedicated Host cost can be divided into two parts:

 

  1. Dedicated Host Unused Cost:  This represents the cost of the Dedicated Host's resources that are not actively used by any instance. For example, if your Dedicated Host has 8 CPU cores, and instances A and B only use 6 cores in total, then the cost of the 2 unused cores would be part of the Dedicated Host Unused Cost.
  2. Dedicated Host Instance Cost:  This is the cost specifically associated with instances A and B that are running on the Dedicated Host.

 

Considering the statement:
 

"It's expected that the Dedicated host cost (both unused and instance cost) won't match between the chart and the drill-down, as the EC2 dedicated host costs are apportioned in the chart but not in the drill-down."

 

What it implies:

 

  • The Chart:  In a chart or summary view, the Dedicated Host cost is divided between unused and instance costs based on an allocation method (apportioning) performed by the platform. So, in the chart, you might see the cost distribution between these two components, and it will add up to the total Dedicated Host cost.
  • The Drill-Down:  In a detailed drill-down view, you might see the cost associated only with the instances themselves but not the apportioned(distributed or allocated) Dedicated Host costs. So, in the drill-down, you might see the instance costs but not the breakdown of unused vs. instance costs.

The reason for this difference is that the detailed drill-down view is designed to focus on individual instance costs, while the chart provides a higher-level overview that includes the allocation of costs across the Dedicated Host and its instances.

 

In summary, the Dedicated Host cost may not match between the chart and the drill-down because the chart shows the allocated costs (both unused and instance costs) for the Dedicated Host as a whole, while the drill-down only shows the instance costs without the breakdown of Dedicated Host costs.