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Author: anaharris-ms

articles/reliability/reliability-community-training.md

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+---
+title: Reliability in Community Training
+description: Find out about reliability in Community Training 
+author: atulsoni87AI
+ms.author: anaharris
+ms.topic: reliability-article
+ms.custom: subject-reliability, references_regions
+ms.prod: non-product-specific
+ms.date: 10/24/2023
+---
+
+
+# Reliability in Community Training
+
+Community Training is a cloud-based solution that enables delivery of large-scale, far-spread training programs with high quality and efficiency. Community Training is an Azure-powered online learning platform to enable organizations of all sizes and types to run large scale training programs for their internal and external communities such as frontline workers, extended workforces, partner ecosystem, volunteer network, program beneficiaries, etc.
+
+This article describes reliability support in Community Training, and covers  both regional resiliency with [availability zones](/azure/reliability/availability-zones-overview?tabs=azure-clit) and [disaster recovery and business continuity](/azure/reliability/disaster-recovery-overview). For a more detailed overview of a reliability principle in Azure, see [Azure reliability](/azure/reliability/overview).
+
+## Availability zone support
+
+[!INCLUDE [Availability zone description](includes/reliability-availability-zone-description-include.md)]
+
+Community Training uses Azure availability zones to provide high availability and fault tolerance within an Azure region. Community training offers both control and data plane availability zone support: 
+
+- The [control plane](/azure/azure-resource-manager/management/control-plane-and-data-plane#control-plane) is zone redundant in the primary regions of availability. 
+
+- The [data plane](/azure/azure-resource-manager/management/control-plane-and-data-plane#data-plane) can be either zonal or zone-redundant, depending on what you choose for your needs. However, it is highly recommended that you choose a zone-redundant deployment in order to avoid data loss in the case of a zone outage. 
+
+
+### Prerequisites
+
+- Availability zones are supported for the following Community Training SKUs:
+
+    - Standard (lower scale of users)
+    - Premium (high scale of users)
+
+- The following table shows all regions that support availability zones for Community Training:
+
+| Americas         | Europe               | Middle East   | Africa             | Asia Pacific   |
+|------------------|----------------------|---------------|--------------------|----------------|
+| West US 2        | UK South             |               |                    | Southeast Asia |
+| South Central US | West Europe          |               |                    | Australia East |
+| East US 2        | North Europe         |               |                    |                |
+| East US          | Sweden Central       |               |                    |                |
+| West US 3        |                      |               |                    |                |
+
+>[!NOTE]
+>Community Training is only supported in [paired regions](./cross-region-replication-azure.md#azure-paired-regions).  Each secondary region is deployed with a zonal configuration.
+
+
+
+### Zonal failover support
+
+Community Training uses a number of dependency Azure services, such as App service and Azure SQL. When you choose a zone redundant deployment, Community Training also creates zonal redundant offerings of those underlying Azure service resources. If one zone fails, all resources, including dependency resources, fail over to one of the healthier zones.
+
+
+#### Create a resource with availability zone enabled
+
+Community Training provides configuration for availability zones only at the time of creation. If you wish to change your availability zone configuration after creation, you'll need to create new resources. To learn how to create your Community Training, see [Create Community Training](). 
+
+### Zone down experience
+
+- **Zonal zone down experience**. During a zone-wide outage, Community Training can have either complete or partial service disruption. The extent to which it is available depends on various factors, such as whether the entire datacenter is down, or whether a specific dependency service isn't no longer available in that zone. 
+
+- **Zone redundant zone down experience**. During a zone-wide outage, you won't experience any impact on provisioned resources. However, you should be prepared for a brief interruption in communication with those resources. Clients typically receive 409 error codes in this situation, and retry logic attempts to re-establish connections at appropriate intervals. New requests are directed to healthy nodes with zero impact on the user. During zone-wide outages, users are able to create new resources and successfully scale existing ones.
+
+## Disaster recovery and business continuity
+
+[!INCLUDE [introduction to disaster recovery](includes/reliability-disaster-recovery-description-include.md)]
+
+The entire disaster recovery procedure for Community Training is manually managed by the Community Training team. Disaster recovery is not active-active or active passive, but is instead based on recovery from the most recent available backup of Azure services. The Community Training team manually creates all resources in the paired region from data backup.
+
+>[!NOTE]
+>Community Training disaster recovery is only supported in [paired regions](./cross-region-replication-azure.md#azure-paired-regions). 
+
+### Disaster recovery in multi-region geography
+
+- In the case of regional disaster, the **control plane** is manually failed over to the paired region. You should expect some service degradation in the time before the failover completes. After the failover, only read-only operations are supported until the disaster region is back online. The service is manually failed back to the original region once it's back online and all operations resume. Recovery Point Objective (RPO) is expected to be ten minutes; Recovery Time Objective (RTO), 24 hours.
+
+- For the **data plane**, Community Training offers microsoft managed disaster recovery. To use managed disaster recovery, you'll need to [enable disaster recovery]() during Community Training instance creation in Azure. Once you enable disaster recovery, Microsoft maintains the backup of storage and database in the paired region. Recovery Point Objective (RPO) is expected to be twelve hours; Recovery Time Objective (RTO), 48 hours.
+
+
+>[!NOTE]
+> RTO depends on database and storage size, latency between the paired region. Database or storage VM capacity (SKU). RPO depends on underlying Azure resources, such as [Azure SQL](/azure/azure-sql/database/recovery-using-backups?view=azuresql&tabs=azure-portal&preserve-view=true#geo-restore-considerations) and Azure storage. 
+
+
+#### Outage detection, notification, and management
+
+When a Community Training health check detects an outage of any service, and in any region, Microsoft will request your consent for failover to the paired region. Microsoft will let you know which features will be available during the disaster recovery procedure. When Microsoft receives your consent, the Community Training team starts the disaster recovery procedure.
+
+>[!IMPORTANT]
+> Learners will not be able to consume audio/video features until the primary region is operational. It's recommended that you avoid media upload operations until the primary site is operational.
+
+
+### Capacity and proactive disaster recovery resiliency
+
+Microsoft and its customers operate under the shared responsibility model. Once any region is down, not only is the Community Training instance migrated to the paired region, but also all product and customer workloads are also migrated to paired region.  This procedure can cause a shortage for resources in the paired region or datacenter. As a result, Disaster recovery availability depends on the available capacity of the underlying Azure resources.