Sizer always finds ways to propose the most optimal solution in terms of resources and cost.
As part of this effort, in certain cases , Sizer adjusts the workload data suposed to be sitting on the cold tier storage(HDDs) onto the hot tier storage(SSDs).
This happens in circumstances where there is surplus of SSDs in the BOM which is unutilized. The unutilised flash capacity is used for cold tier data if it helps reduce the overall number of nodes or if it helps avoid adding additional disks to met large HDD requirement if the extra SSD capacity can meet the same. The defined threshold levels are maintained and does not change for this adjustment in particular.
The same can be seen in a separate row in the calculation table and the Sizer BOM . Sample below:
