Merge pull request #220107 from miwithro/patch-185

Update use-azure-dedicated-hosts.md

Author: JamesJBarnett

articles/aks/use-azure-dedicated-hosts.md

@@ -3,7 +3,7 @@ title: Use Azure Dedicated Hosts in Azure Kubernetes Service (AKS)
 description: Learn how to create an Azure Dedicated Hosts Group and associate it with Azure Kubernetes Service (AKS)
 services: container-service
 ms.topic: article
-ms.date: 09/13/2022
+ms.date: 12/01/2022
 ---
 
 # Add Azure Dedicated Host to an Azure Kubernetes Service (AKS) cluster
@@ -28,16 +28,7 @@ The following limitations apply when you integrate Azure Dedicated Host with Azu
 * It isn't supported to update agent pool from host group A to host group B.
 * Using ADH across subscriptions.
 
-## Add a Dedicated Host Group to an AKS cluster
-
-A host group is a resource that represents a collection of dedicated hosts. You create a host group in a region and an availability zone, and add hosts to it. When planning for high availability, there are more options. You can use one or both of the following options with your dedicated hosts:
-
-* Span across multiple availability zones. In this case, you're required to have a host group in each of the zones you wish to use.
-* Span across multiple fault domains, which are mapped to physical racks.
-
-In either case, you need to provide the fault domain count for your host group. If you don't want to span fault domains in your group, use a fault domain count of 1.
-
-You can also decide to use both availability zones and fault domains.
+## Planning for ADH Capacity on AKS
 
 Not all host SKUs are available in all regions, and availability zones. You can list host availability, and any offer restrictions before you start provisioning dedicated hosts.
 
@@ -49,6 +40,25 @@ az vm list-skus -l eastus  -r hostGroups/hosts  -o table
 > First, when using host group, the nodepool fault domain count is always the same as the host group fault domain count. In order to use cluster auto-scaling to work with ADH and AKS, please make sure your host group fault domain count and capacity is enough.
 > Secondly, only change fault domain count from the default of 1 to any other number if you know what they are doing as a misconfiguration could lead to a unscalable configuration.
 
+[Determine how many hosts you would need based on the expected VM Utilization](https://learn.microsoft.com/azure/virtual-machines/dedicated-host-general-purpose-skus).
+
+Evaluate [host utilization](https://learn.microsoft.com/azure/virtual-machines/dedicated-hosts-how-to?tabs=cli#check-the-status-of-the-host) to determine the number of allocatable VMs by size before you deploy.
+
+```azurecli-interactive
+az vm host get-instance-view -g myDHResourceGroup --host-group MyHostGroup --name MyHost
+```
+
+## Add a Dedicated Host Group to an AKS cluster
+
+A host group is a resource that represents a collection of dedicated hosts. You create a host group in a region and an availability zone, and add hosts to it. When planning for high availability, there are more options. You can use one or both of the following options with your dedicated hosts:
+
+* Span across multiple availability zones. In this case, you're required to have a host group in each of the zones you wish to use.
+* Span across multiple fault domains, which are mapped to physical racks.
+
+In either case, you need to provide the fault domain count for your host group. If you don't want to span fault domains in your group, use a fault domain count of 1.
+
+You can also decide to use both availability zones and fault domains.
+
 ## Create a Host Group
 
 Now create a dedicated host in the host group. In addition to a name for the host, you're required to provide the SKU for the host. Host SKU captures the supported VM series and the hardware generation for your dedicated host.