Azure Hybrid Use Benefit calculations seem off

[flanakin]

Discussed in #709

^{Originally posted by lundejd May 20, 2024}
I finally got around to reviewing the Hybrid Benefit tab and am immediately confused by the numbers. For example, we have a Standard_D2ds_v5 server that has 2 vCPUs. On the bottom that same server is listed but the column vCPUs says 16. I have another of the same Standard_D2ds_v5 that has vCPUs of 2, which is correct, and AHB vCPUs of 8 which is correct.

This is only the beginning. Let's say I wanted to license a 16 vCPU server in Azure with AHUB, I would only need to use 16 core licenses to do it. The chart shows 64 and a usage quantity of 24.

I would think AHUB should look like this:

vCPUs. AHB vCPUs
1 8
2 8
8 8
10 16
16 16
20 24

and so on. minimum 8, multiples of 8. vCPU systems that don't divide into 8 end up with some "wasted" AHUB cores.

AHB vCPUs that are enabled should equal UsageQuantity. If I have an 8 vCPU machine enabled for AHUB it should use 8 vCPUs. UsageQuantity seems to be 24 for most.

Here is a screen shot with the same size server, the first has accurate info but the following do not.