"The engineer should design a system to handle all, or nearly all, IOPS in one particular tier"

Explanation
A node can tolerate a single fan module fault, and the surviving fans increase their speed to compensate for the faulted module. If two fan modules fault within the same node, the node performs a protective thermal shutdown. A protective thermal shutdown gracefully powers off the node, and any resource fails over to the surviving node

Explanation
Forecasting metrics are not being displayed because forecasting was not turned on during configuration.
Forecasting is an advanced feature that requires explicit activation during setup. If it's not enabled during the initial configuration, it will not be available later. It is not a license-related issue as the question does not mention any license related to it. The amount of capacity in the appliance does not affect the ability to display forecasting metrics. Forecasting metrics display after 7 days of initial configuration not 16.