Creating QNM scenario

To create QNM scenario

To create a new scenario, click the Add scenario button found at the top of the the Prediction scenarios table on the model's detail page. A new scenario will be created automatically, and its detail page will appear.

QN scenario - detail page

In the scenario details page, enter the required parameters to perform the prediction.

• In the Business Drivers table, update the business driver metric values that you want to estimate:
  • Current value: The latest value that is available for the business driver metrics. By default, the average value of the business driver is displayed as a current value. You can change this statistic and time filter by using the Estimate current values option. 
  • Target growth factor: The expected increase in the value. It is the ratio between the target and the current values. By default, the growth factor of 10 is applied.
  • Target value: The estimated values based on the growth factor. It is calculated as the current value multiplied by the growth factor. By default, it is set to 10 times the current value.
• In the Systems table, perform a what-if analysis to simulate scenarios, such as hardware and system changes, and find the appropriate configuration that suits your requirements. You can choose the multiplicity of every existing system/resource and calculate its speed variation, based on the built-in benchmark data.
  • Current system: Displays the current system details.
  • What-if system: When you select a different vendor and hardware model while calculating a speed variation, the selected system is displayed as a what-if system. For more information, see Benchmark comparison.
  • Current multiplicity: For each system, it displays the multiplicity value for the number of servers that currently makes up the system. It is defined by the SYS_MULTIPLICITY property in the system's configuration table.
  • What-if multiplicity: A different number of servers that will make up the system. Perform a what-if analysis by entering a value different than Current multiplicity. 
  • Current quantity: For each resource of the system, it displays the number of parallel processing units available for the resource. For example, the current number of cores for the CPU resource. In the case of memory, it is fixed to 1 as the memory bus is unique across an entire system.
  • What-if quantity: For each resource, specify a value different than the Current quantity.
  • Scenario speed-up: For each resource, perform a scenario speed variation. Click the Calc option to open the Compute speedup page. For more information, see Benchmark comparison.

When done, click the Run prediction button to run the model in the configured scenario.

Benchmark comparison

While performing what-if analyses, you might want to estimate what would happen if a server was substituted with a different one; the Compute speedup screen enables you to define a different hardware configuration. To evaluate the speedup, complete the following steps:

1. Select the desired benchmark; a description of your selection will be displayed to help you in your selection.
2. Pick the vendor and hardware model for the current system.
3. Pick the vendor and hardware model for the what-if system.
4. Choose whether you want to normalize the benchmark results by taking into account the number of CPU cores.
   Click Save to confirm your choices and return to the scenario's detail page. The Scenario speed-up percentage value in the Systems table will be automatically updated with the result of the Compute speedup settings.

Calculating speedup through benchmark data