Updated FAQs.

Author: MaryMichael-MS

articles/migrate/common-questions-business-case.md

@@ -6,7 +6,7 @@ ms.author: rajosh
 ms.manager: ronai
 ms.topic: conceptual
 ms.service: azure-migrate
-ms.date: 07/17/2023
+ms.date: 04/22/2024
 ms.custom: references_regions, engagement-fy23
 ---
 
@@ -43,11 +43,7 @@ Business case creates assessments in the background, which could take some time
 
 ### How do I build a business case?
 
-Currently, you can create a Business case on servers and workloads discovered using a lightweight Azure Migrate appliance in your VMware, Hyper-V and Physical/Baremetal environment. The appliance discovers on-premises servers and workloads. It then sends server metadata and performance data to Azure Migrate.
-
-### Why is the Build business case feature disabled?
-
-The **Build business case** feature will be enabled only when you have discovery performed using an Azure Migrate appliance for servers and workloads in your VMware, Hyper-V and Physical/Baremetal environment. The Business case feature isn't supported for servers and/or workloads imported via a .csv file.
+Currently, you can create a Business case on servers and workloads discovered using a lightweight Azure Migrate appliance in your VMware, Hyper-V, and Physical/Baremetal environment or servers discovered using a .csv or RVTools .xlsx import. The appliance discovers on-premises servers and workloads. It then sends server metadata and performance data to Azure Migrate.
 
 ### Why can’t I build business case from my project?
 
@@ -65,19 +61,6 @@ To verify in an existing project:
 
     Germany West Central and Sweden Central
 
-### Why can't I change the currency during business case creation?
-Currently, the currency is defaulted to USD.
-
-### What does the different migration strategies mean?
-**Migration Strategy** | **Details** | **Assessment insights**
---- | --- | ---
-**Azure recommended to minimize cost** | You can get the most cost efficient and compatible target recommendation in Azure across Azure IaaS and Azure PaaS targets |  For SQL Servers, sizing and cost comes from the *Recommended report* with optimization strategy- minimize cost from Azure SQL assessment.<br/><br/> For web apps, sizing and cost comes from Azure App Service assessment is picked.<br/><br/> For general servers, sizing and cost comes from Azure VM assessment.
-**Migrate to all IaaS (Infrastructure as a Service)** | You can get a quick lift and shift recommendation to Azure IaaS. | For SQL Servers, sizing and cost comes from the *Instance to SQL Server on Azure VM* report.<br/><br/> For general servers and servers hosting web apps, sizing and cost comes from Azure VM assessment.
-**Modernize to PaaS (Platform as a Service)** | You can get a PaaS preferred recommendation that means, the logic identifies workloads best fit for PaaS targets.<br/><br/> General servers are recommended with a quick lift and shift recommendation to Azure IaaS. |  For SQL Servers, sizing and cost comes from the *Recommended report* with optimization strategy - *Modernize to PaaS* from Azure SQL assessment.<br/><br/> For web apps, sizing and cost comes from Azure App Service assessment. For general servers, sizing and cost comes from Azure VM assessment.
-
-> [!NOTE]
-> Although the Business case picks Azure recommendations from certain assessments, you won't be able to access the assessments directly. To deep dive into sizing, readiness and Azure cost estimates, you can create respective assessments for the servers or workloads.
-
 ## Business case recommendation
 
 
@@ -110,6 +93,46 @@ To deep dive into sizing, readiness, and Azure cost estimates, you can create re
 ### Does the Azure SQL recommendation logic include SQL consolidation?
 No, it doesn't include SQL consolidation.
 
+### How do I add facilities costs to my business case?
+
+1. Go to your business case and select **Edit assumptions** and choose **On-premises cost assumptions**.
+1. Select **Facilities** tab. 
+1. Specify estimated annual lease/colocation/power costs that you want to include as facilities costs in the calculations.
+
+If you aren't aware of your facilities costs, use the following methodology.
+
+### Step-by-step guide to calculate facilities costs
+ The facilities cost calculation in Azure Migrate is based on the Cloud Economics methodology, tailored specifically for your on-premises datacenter. This methodology is based on a colocation model, which prescribes an average cost value per kWh, which includes space, power and lease costs, which usually comprise facilities costs for a datacenter.   
+1. **Determine the current energy consumption (in kWh) for your workloads**: Energy consumption by current workloads = Energy consumption for compute resources + Energy consumption for storage resources.
+    1. **Energy consumption for compute resources**:  
+        1. **Determine the total number of physical cores in your on-premises infrastructure**: In case you don't have the number of physical cores, you can use the formula - Total number of physical cores = Total number of virtual cores/2.
+        1. **Input the number of physical cores into the given formula**: Energy consumption for compute resources (kWh) = Total number of physical cores * On-Prem Thermal Design Power or TDP (kWh per core) * Integration of Load factor * On-premises Power Utilization Efficiency or PUE.
+        1. If you aren't aware of the values of TDP, Integration of Load factor and On-premises PUE for your datacenter, you can use the following assumptions for your calculations:
+            1. On-Prem TDP (kWh per core) = 0.009
+            1. Integration of Load factor = 2.00 
+            1. On-Prem PUE = 1.80
+    1. **Energy consumption for storage resources**:
+        1. **Determine the total storage in use for your on-premises infrastructure in Terabytes (TB)**. 
+        1. **Input the storage in TB into the given formula**: Energy consumption for storage resources (kWh) = Total storage capacity in TB * On-Prem storage Power Rating (kWh per TB) * Conversion of energy consumption into Peak consumption * Integration of Load factor * On-premises PUE (Power utilization effectiveness).
+        1. If you aren't aware of the values of On-premises storage power rating, conversion factor for energy consumption into peak consumption, and Integration of Load factor and On-premises PUE, you can use the following assumptions for your calculations:
+            1. On-Prem storage power rating (kWh per TB) = 10
+            1. Conversion of energy consumption into peak consumption = 0.0001
+            1. Integration of Load factor = 2.00
+            1. On-Prem PUE = 1.80
+1. Determine the unused energy capacity for your on-premises infrastructure. If you aren't aware of the unused capacity, by default you can assume that 40% of the datacenter energy capacity remains unused.
+1. Determine the total energy capacity of the datacenter. Total energy capacity = Energy consumption by current workloads / (1- unused energy capacity).
+1. Calculate total facilities costs per year using the following formula. Facilities costs per year = Total energy capacity * Average colocation costs ($ per kWh per month) * 12. You can assume the average colocation cost = $340 per kWh per month.
+
+**Sample example**  
+
+Assume that Contoso, an e-commerce company has 10,000 virtual cores and 5,000 TB of storage. Let's use the formula to calculate facilities cost:
+1. Total number physical cores = 10,000/2 = 5,000 
+1. Energy consumption for compute resources = 5,000*0.009*2*1.8 = 162 kWh 
+1. Energy consumption for storage resources = 5,000*10*0.0001*2*1.8 = 18 kWh 
+1. Energy consumption for current workloads = (162 + 18) kWh = 180 kWh
+1. Total energy capacity of datacenter = 180/(1-0.4) = 300 kWh
+1. Yearly facilities cost = 300 kWh* $340 per kWh * 12 = $1,224,000 = $1.224 In  
+
 ## Next steps
 
 - [Learn more](how-to-build-a-business-case.md) about how to build a Business case.