Merge pull request #196656 from suzizuber/szuber/update-storage-policies-and-fault-tolerance-section

Update concepts-storage.md

Author: ShannonLeavitt

articles/azure-vmware/concepts-storage.md

@@ -3,7 +3,7 @@ title: Concepts - Storage
 description: Learn about storage capacity, storage policies, fault tolerance, and storage integration in Azure VMware Solution private clouds.
 ms.topic: conceptual
 ms.custom: contperf-fy21q4
-ms.date: 08/31/2021
+ms.date: 05/02/2022
 ---
 
 # Azure VMware Solution storage concepts
@@ -28,22 +28,18 @@ Local storage in cluster hosts is used in the cluster-wide vSAN datastore. All d
 
 ## Storage policies and fault tolerance
 
-The default storage policy is set to RAID-1 (Mirroring), FTT-1, and thick provisioning. Unless you adjust the storage policy or apply a new policy, the cluster grows with this configuration. To set the storage policy, see [Configure storage policy](configure-storage-policy.md).
+The default storage policy is set to RAID-1 (Mirroring) FTT-1, with Object Space Reservation set to Thin provisioning. Unless you adjust the storage policy or apply a new policy, the cluster grows with this configuration. This is the policy that will be applied to the workload VMs. To set a different storage policy, see [Configure storage policy](configure-storage-policy.md).
 
 In a three-host cluster, FTT-1 accommodates a single host's failure. Microsoft governs failures regularly and replaces the hardware when events are detected from an operations perspective.
 
-:::image type="content" source="media/concepts/vsphere-vm-storage-policies.png" alt-text="Screenshot that shows the vSphere Client VM Storage Policies.":::
+> [!NOTE]
+> When you log on to the vSphere Client, you may notice a VM Storage Policy called **vSAN Default Storage Policy** with **Object Space Reservation** set to **Thick** provisioning. Please note that this is not the default storage policy applied to the cluster. This policy exists for historical purposes and will eventually be modified to **Thin** provisioning. 
 
-
-|Provisioning type  |Description  |
-|---------|---------|
-|**Thick**      | Reserved or pre-allocated storage space. It protects systems by allowing them to function even if the vSAN datastore is full because the space is already reserved. For example, if you create a 10-GB virtual disk with thick provisioning. In that case, the full amount of virtual disk storage capacity is pre-allocated on the physical storage of the virtual disk and consumes all the space allocated to it in the datastore. It won't allow other virtual machines (VMs) to share the space from the datastore.         |
-|**Thin**      | Consumes the space that it needs initially and grows to the data space demand used in the datastore. Outside the default (thick provision), you can create VMs with FTT-1 thin provisioning. For deduplication setup, use thin provisioning for your VM template.         |
+> [!NOTE]
+> All of the software-defined data center (SDDC) management VMs (vCenter, NSX manager, NSX controller, NSX edges, and others) use the **Microsoft vSAN Management Storage Policy**, with **Object Space Reservation** set to **Thick** provisioning.
 
 >[!TIP]
->If you're unsure if the cluster will grow to four or more, then deploy using the default policy.  If you're sure your cluster will grow, then instead of expanding the cluster after your initial deployment, we recommend to deploy the extra hosts during deployment. As the VMs are deployed to the cluster, change the disk's storage policy in the VM settings to either RAID-5 FTT-1 or RAID-6 FTT-2. 
->
->:::image type="content" source="media/concepts/vsphere-vm-storage-policies-2.png" alt-text="Screenshot showing the RAID-5 FTT-1 and RAID-6 FTT-2 options highlighed.":::
+>If you're unsure if the cluster will grow to four or more, then deploy using the default policy.  If you're sure your cluster will grow, then instead of expanding the cluster after your initial deployment, we recommend deploying the extra hosts during deployment. As the VMs are deployed to the cluster, change the disk's storage policy in the VM settings to either RAID-5 FTT-1 or RAID-6 FTT-2. In reference to [SLA for Azure VMware Solution](https://azure.microsoft.com/support/legal/sla/azure-vmware/v1_1/), note that more than 6 hosts should be configured in the cluster to use an FTT-2 policy (RAID-1, or RAID-6). Also note that the storage policy is not automatically updated based on cluster size. Similarly, changing the default does not automatically update the running VM policies.  
 
 
 ## Data-at-rest encryption